diff --git a/.github/workflows/test-devel.yml b/.github/workflows/test-devel.yml
index f73176b..0ba6d98 100644
--- a/.github/workflows/test-devel.yml
+++ b/.github/workflows/test-devel.yml
@@ -432,8 +432,8 @@ jobs:
         path: '~'
     - name: Unpack artefacts
       run: cd ~; find -name 'artefacts-*.tar.gz' -exec tar -xzf '{}' \;
-    - name: Install Atheme
-      run: sudo apt-get install atheme-services
+    - name: Install system dependencies
+      run: sudo apt-get install atheme-services faketime
     - name: Install irctest dependencies
       run: |-
         python -m pip install --upgrade pip
@@ -470,8 +470,8 @@ jobs:
         path: '~'
     - name: Unpack artefacts
       run: cd ~; find -name 'artefacts-*.tar.gz' -exec tar -xzf '{}' \;
-    - name: Install Atheme
-      run: sudo apt-get install atheme-services
+    - name: Install system dependencies
+      run: sudo apt-get install atheme-services faketime
     - name: Install irctest dependencies
       run: |-
         python -m pip install --upgrade pip
@@ -502,8 +502,8 @@ jobs:
         path: '~'
     - name: Unpack artefacts
       run: cd ~; find -name 'artefacts-*.tar.gz' -exec tar -xzf '{}' \;
-    - name: Install Atheme
-      run: sudo apt-get install atheme-services
+    - name: Install system dependencies
+      run: sudo apt-get install atheme-services faketime
     - name: Install irctest dependencies
       run: |-
         python -m pip install --upgrade pip
@@ -541,8 +541,8 @@ jobs:
         cd $GITHUB_WORKSPACE/ergo/
         make build
         make install
-    - name: Install Atheme
-      run: sudo apt-get install atheme-services
+    - name: Install system dependencies
+      run: sudo apt-get install atheme-services faketime
     - name: Install irctest dependencies
       run: |-
         python -m pip install --upgrade pip
@@ -579,8 +579,8 @@ jobs:
         path: '~'
     - name: Unpack artefacts
       run: cd ~; find -name 'artefacts-*.tar.gz' -exec tar -xzf '{}' \;
-    - name: Install Atheme
-      run: sudo apt-get install atheme-services
+    - name: Install system dependencies
+      run: sudo apt-get install atheme-services faketime
     - name: Install irctest dependencies
       run: |-
         python -m pip install --upgrade pip
@@ -611,8 +611,8 @@ jobs:
         path: '~'
     - name: Unpack artefacts
       run: cd ~; find -name 'artefacts-*.tar.gz' -exec tar -xzf '{}' \;
-    - name: Install Atheme
-      run: sudo apt-get install atheme-services
+    - name: Install system dependencies
+      run: sudo apt-get install atheme-services faketime
     - name: Install irctest dependencies
       run: |-
         python -m pip install --upgrade pip
@@ -649,8 +649,8 @@ jobs:
         path: '~'
     - name: Unpack artefacts
       run: cd ~; find -name 'artefacts-*.tar.gz' -exec tar -xzf '{}' \;
-    - name: Install Atheme
-      run: sudo apt-get install atheme-services
+    - name: Install system dependencies
+      run: sudo apt-get install atheme-services faketime
     - name: Install irctest dependencies
       run: |-
         python -m pip install --upgrade pip
@@ -687,8 +687,8 @@ jobs:
         ./configure --prefix=$HOME/.local/ --with-maxcon=1024 --enable-debug
         make -j 4
         make install
-    - name: Install Atheme
-      run: sudo apt-get install atheme-services
+    - name: Install system dependencies
+      run: sudo apt-get install atheme-services faketime
     - name: Install irctest dependencies
       run: |-
         python -m pip install --upgrade pip
@@ -714,8 +714,8 @@ jobs:
     - name: Install dependencies
       run: pip install git+https://github.com/ProgVal/Limnoria.git@testing cryptography
         pyxmpp2-scram
-    - name: Install Atheme
-      run: sudo apt-get install atheme-services
+    - name: Install system dependencies
+      run: sudo apt-get install atheme-services faketime
     - name: Install irctest dependencies
       run: |-
         python -m pip install --upgrade pip
@@ -783,8 +783,8 @@ jobs:
         path: '~'
     - name: Unpack artefacts
       run: cd ~; find -name 'artefacts-*.tar.gz' -exec tar -xzf '{}' \;
-    - name: Install Atheme
-      run: sudo apt-get install atheme-services
+    - name: Install system dependencies
+      run: sudo apt-get install atheme-services faketime
     - name: Install irctest dependencies
       run: |-
         python -m pip install --upgrade pip
@@ -821,8 +821,8 @@ jobs:
         path: '~'
     - name: Unpack artefacts
       run: cd ~; find -name 'artefacts-*.tar.gz' -exec tar -xzf '{}' \;
-    - name: Install Atheme
-      run: sudo apt-get install atheme-services
+    - name: Install system dependencies
+      run: sudo apt-get install atheme-services faketime
     - name: Install irctest dependencies
       run: |-
         python -m pip install --upgrade pip
@@ -853,8 +853,8 @@ jobs:
         path: '~'
     - name: Unpack artefacts
       run: cd ~; find -name 'artefacts-*.tar.gz' -exec tar -xzf '{}' \;
-    - name: Install Atheme
-      run: sudo apt-get install atheme-services
+    - name: Install system dependencies
+      run: sudo apt-get install atheme-services faketime
     - name: Install irctest dependencies
       run: |-
         python -m pip install --upgrade pip
@@ -891,8 +891,8 @@ jobs:
         path: '~'
     - name: Unpack artefacts
       run: cd ~; find -name 'artefacts-*.tar.gz' -exec tar -xzf '{}' \;
-    - name: Install Atheme
-      run: sudo apt-get install atheme-services
+    - name: Install system dependencies
+      run: sudo apt-get install atheme-services faketime
     - name: Install irctest dependencies
       run: |-
         python -m pip install --upgrade pip
@@ -923,8 +923,8 @@ jobs:
         path: '~'
     - name: Unpack artefacts
       run: cd ~; find -name 'artefacts-*.tar.gz' -exec tar -xzf '{}' \;
-    - name: Install Atheme
-      run: sudo apt-get install atheme-services
+    - name: Install system dependencies
+      run: sudo apt-get install atheme-services faketime
     - name: Install irctest dependencies
       run: |-
         python -m pip install --upgrade pip
@@ -949,8 +949,8 @@ jobs:
         python-version: 3.7
     - name: Install dependencies
       run: pip install git+https://github.com/sopel-irc/sopel.git
-    - name: Install Atheme
-      run: sudo apt-get install atheme-services
+    - name: Install system dependencies
+      run: sudo apt-get install atheme-services faketime
     - name: Install irctest dependencies
       run: |-
         python -m pip install --upgrade pip
@@ -981,8 +981,8 @@ jobs:
         path: '~'
     - name: Unpack artefacts
       run: cd ~; find -name 'artefacts-*.tar.gz' -exec tar -xzf '{}' \;
-    - name: Install Atheme
-      run: sudo apt-get install atheme-services
+    - name: Install system dependencies
+      run: sudo apt-get install atheme-services faketime
     - name: Install irctest dependencies
       run: |-
         python -m pip install --upgrade pip
@@ -1013,8 +1013,8 @@ jobs:
         path: '~'
     - name: Unpack artefacts
       run: cd ~; find -name 'artefacts-*.tar.gz' -exec tar -xzf '{}' \;
-    - name: Install Atheme
-      run: sudo apt-get install atheme-services
+    - name: Install system dependencies
+      run: sudo apt-get install atheme-services faketime
     - name: Install irctest dependencies
       run: |-
         python -m pip install --upgrade pip
@@ -1051,8 +1051,8 @@ jobs:
         path: '~'
     - name: Unpack artefacts
       run: cd ~; find -name 'artefacts-*.tar.gz' -exec tar -xzf '{}' \;
-    - name: Install Atheme
-      run: sudo apt-get install atheme-services
+    - name: Install system dependencies
+      run: sudo apt-get install atheme-services faketime
     - name: Install irctest dependencies
       run: |-
         python -m pip install --upgrade pip
@@ -1083,8 +1083,8 @@ jobs:
         path: '~'
     - name: Unpack artefacts
       run: cd ~; find -name 'artefacts-*.tar.gz' -exec tar -xzf '{}' \;
-    - name: Install Atheme
-      run: sudo apt-get install atheme-services
+    - name: Install system dependencies
+      run: sudo apt-get install atheme-services faketime
     - name: Install irctest dependencies
       run: |-
         python -m pip install --upgrade pip
diff --git a/.github/workflows/test-devel_release.yml b/.github/workflows/test-devel_release.yml
index 8fa975f..d639825 100644
--- a/.github/workflows/test-devel_release.yml
+++ b/.github/workflows/test-devel_release.yml
@@ -117,8 +117,8 @@ jobs:
         path: '~'
     - name: Unpack artefacts
       run: cd ~; find -name 'artefacts-*.tar.gz' -exec tar -xzf '{}' \;
-    - name: Install Atheme
-      run: sudo apt-get install atheme-services
+    - name: Install system dependencies
+      run: sudo apt-get install atheme-services faketime
     - name: Install irctest dependencies
       run: |-
         python -m pip install --upgrade pip
@@ -155,8 +155,8 @@ jobs:
         path: '~'
     - name: Unpack artefacts
       run: cd ~; find -name 'artefacts-*.tar.gz' -exec tar -xzf '{}' \;
-    - name: Install Atheme
-      run: sudo apt-get install atheme-services
+    - name: Install system dependencies
+      run: sudo apt-get install atheme-services faketime
     - name: Install irctest dependencies
       run: |-
         python -m pip install --upgrade pip
@@ -187,8 +187,8 @@ jobs:
         path: '~'
     - name: Unpack artefacts
       run: cd ~; find -name 'artefacts-*.tar.gz' -exec tar -xzf '{}' \;
-    - name: Install Atheme
-      run: sudo apt-get install atheme-services
+    - name: Install system dependencies
+      run: sudo apt-get install atheme-services faketime
     - name: Install irctest dependencies
       run: |-
         python -m pip install --upgrade pip
diff --git a/.github/workflows/test-stable.yml b/.github/workflows/test-stable.yml
index c4a0468..5936fe6 100644
--- a/.github/workflows/test-stable.yml
+++ b/.github/workflows/test-stable.yml
@@ -475,8 +475,8 @@ jobs:
         path: '~'
     - name: Unpack artefacts
       run: cd ~; find -name 'artefacts-*.tar.gz' -exec tar -xzf '{}' \;
-    - name: Install Atheme
-      run: sudo apt-get install atheme-services
+    - name: Install system dependencies
+      run: sudo apt-get install atheme-services faketime
     - name: Install irctest dependencies
       run: |-
         python -m pip install --upgrade pip
@@ -513,8 +513,8 @@ jobs:
         path: '~'
     - name: Unpack artefacts
       run: cd ~; find -name 'artefacts-*.tar.gz' -exec tar -xzf '{}' \;
-    - name: Install Atheme
-      run: sudo apt-get install atheme-services
+    - name: Install system dependencies
+      run: sudo apt-get install atheme-services faketime
     - name: Install irctest dependencies
       run: |-
         python -m pip install --upgrade pip
@@ -545,8 +545,8 @@ jobs:
         path: '~'
     - name: Unpack artefacts
       run: cd ~; find -name 'artefacts-*.tar.gz' -exec tar -xzf '{}' \;
-    - name: Install Atheme
-      run: sudo apt-get install atheme-services
+    - name: Install system dependencies
+      run: sudo apt-get install atheme-services faketime
     - name: Install irctest dependencies
       run: |-
         python -m pip install --upgrade pip
@@ -577,8 +577,8 @@ jobs:
         path: '~'
     - name: Unpack artefacts
       run: cd ~; find -name 'artefacts-*.tar.gz' -exec tar -xzf '{}' \;
-    - name: Install Atheme
-      run: sudo apt-get install atheme-services
+    - name: Install system dependencies
+      run: sudo apt-get install atheme-services faketime
     - name: Install irctest dependencies
       run: |-
         python -m pip install --upgrade pip
@@ -616,8 +616,8 @@ jobs:
         cd $GITHUB_WORKSPACE/ergo/
         make build
         make install
-    - name: Install Atheme
-      run: sudo apt-get install atheme-services
+    - name: Install system dependencies
+      run: sudo apt-get install atheme-services faketime
     - name: Install irctest dependencies
       run: |-
         python -m pip install --upgrade pip
@@ -654,8 +654,8 @@ jobs:
         path: '~'
     - name: Unpack artefacts
       run: cd ~; find -name 'artefacts-*.tar.gz' -exec tar -xzf '{}' \;
-    - name: Install Atheme
-      run: sudo apt-get install atheme-services
+    - name: Install system dependencies
+      run: sudo apt-get install atheme-services faketime
     - name: Install irctest dependencies
       run: |-
         python -m pip install --upgrade pip
@@ -686,8 +686,8 @@ jobs:
         path: '~'
     - name: Unpack artefacts
       run: cd ~; find -name 'artefacts-*.tar.gz' -exec tar -xzf '{}' \;
-    - name: Install Atheme
-      run: sudo apt-get install atheme-services
+    - name: Install system dependencies
+      run: sudo apt-get install atheme-services faketime
     - name: Install irctest dependencies
       run: |-
         python -m pip install --upgrade pip
@@ -724,8 +724,8 @@ jobs:
         path: '~'
     - name: Unpack artefacts
       run: cd ~; find -name 'artefacts-*.tar.gz' -exec tar -xzf '{}' \;
-    - name: Install Atheme
-      run: sudo apt-get install atheme-services
+    - name: Install system dependencies
+      run: sudo apt-get install atheme-services faketime
     - name: Install irctest dependencies
       run: |-
         python -m pip install --upgrade pip
@@ -756,8 +756,8 @@ jobs:
         path: '~'
     - name: Unpack artefacts
       run: cd ~; find -name 'artefacts-*.tar.gz' -exec tar -xzf '{}' \;
-    - name: Install Atheme
-      run: sudo apt-get install atheme-services
+    - name: Install system dependencies
+      run: sudo apt-get install atheme-services faketime
     - name: Install irctest dependencies
       run: |-
         python -m pip install --upgrade pip
@@ -810,8 +810,8 @@ jobs:
         mkdir -p $HOME/.local/bin
 
         cp $HOME/.local/sbin/ircd $HOME/.local/bin/ircd'
-    - name: Install Atheme
-      run: sudo apt-get install atheme-services
+    - name: Install system dependencies
+      run: sudo apt-get install atheme-services faketime
     - name: Install irctest dependencies
       run: |-
         python -m pip install --upgrade pip
@@ -848,8 +848,8 @@ jobs:
         ./configure --prefix=$HOME/.local/ --with-maxcon=1024 --enable-debug
         make -j 4
         make install
-    - name: Install Atheme
-      run: sudo apt-get install atheme-services
+    - name: Install system dependencies
+      run: sudo apt-get install atheme-services faketime
     - name: Install irctest dependencies
       run: |-
         python -m pip install --upgrade pip
@@ -874,8 +874,8 @@ jobs:
         python-version: 3.7
     - name: Install dependencies
       run: pip install limnoria==2022.03.17 cryptography pyxmpp2-scram
-    - name: Install Atheme
-      run: sudo apt-get install atheme-services
+    - name: Install system dependencies
+      run: sudo apt-get install atheme-services faketime
     - name: Install irctest dependencies
       run: |-
         python -m pip install --upgrade pip
@@ -943,8 +943,8 @@ jobs:
         path: '~'
     - name: Unpack artefacts
       run: cd ~; find -name 'artefacts-*.tar.gz' -exec tar -xzf '{}' \;
-    - name: Install Atheme
-      run: sudo apt-get install atheme-services
+    - name: Install system dependencies
+      run: sudo apt-get install atheme-services faketime
     - name: Install irctest dependencies
       run: |-
         python -m pip install --upgrade pip
@@ -981,8 +981,8 @@ jobs:
         path: '~'
     - name: Unpack artefacts
       run: cd ~; find -name 'artefacts-*.tar.gz' -exec tar -xzf '{}' \;
-    - name: Install Atheme
-      run: sudo apt-get install atheme-services
+    - name: Install system dependencies
+      run: sudo apt-get install atheme-services faketime
     - name: Install irctest dependencies
       run: |-
         python -m pip install --upgrade pip
@@ -1013,8 +1013,8 @@ jobs:
         path: '~'
     - name: Unpack artefacts
       run: cd ~; find -name 'artefacts-*.tar.gz' -exec tar -xzf '{}' \;
-    - name: Install Atheme
-      run: sudo apt-get install atheme-services
+    - name: Install system dependencies
+      run: sudo apt-get install atheme-services faketime
     - name: Install irctest dependencies
       run: |-
         python -m pip install --upgrade pip
@@ -1051,8 +1051,8 @@ jobs:
         path: '~'
     - name: Unpack artefacts
       run: cd ~; find -name 'artefacts-*.tar.gz' -exec tar -xzf '{}' \;
-    - name: Install Atheme
-      run: sudo apt-get install atheme-services
+    - name: Install system dependencies
+      run: sudo apt-get install atheme-services faketime
     - name: Install irctest dependencies
       run: |-
         python -m pip install --upgrade pip
@@ -1083,8 +1083,8 @@ jobs:
         path: '~'
     - name: Unpack artefacts
       run: cd ~; find -name 'artefacts-*.tar.gz' -exec tar -xzf '{}' \;
-    - name: Install Atheme
-      run: sudo apt-get install atheme-services
+    - name: Install system dependencies
+      run: sudo apt-get install atheme-services faketime
     - name: Install irctest dependencies
       run: |-
         python -m pip install --upgrade pip
@@ -1109,8 +1109,8 @@ jobs:
         python-version: 3.7
     - name: Install dependencies
       run: pip install sopel==7.1.8
-    - name: Install Atheme
-      run: sudo apt-get install atheme-services
+    - name: Install system dependencies
+      run: sudo apt-get install atheme-services faketime
     - name: Install irctest dependencies
       run: |-
         python -m pip install --upgrade pip
@@ -1141,8 +1141,8 @@ jobs:
         path: '~'
     - name: Unpack artefacts
       run: cd ~; find -name 'artefacts-*.tar.gz' -exec tar -xzf '{}' \;
-    - name: Install Atheme
-      run: sudo apt-get install atheme-services
+    - name: Install system dependencies
+      run: sudo apt-get install atheme-services faketime
     - name: Install irctest dependencies
       run: |-
         python -m pip install --upgrade pip
@@ -1173,8 +1173,8 @@ jobs:
         path: '~'
     - name: Unpack artefacts
       run: cd ~; find -name 'artefacts-*.tar.gz' -exec tar -xzf '{}' \;
-    - name: Install Atheme
-      run: sudo apt-get install atheme-services
+    - name: Install system dependencies
+      run: sudo apt-get install atheme-services faketime
     - name: Install irctest dependencies
       run: |-
         python -m pip install --upgrade pip
@@ -1211,8 +1211,8 @@ jobs:
         path: '~'
     - name: Unpack artefacts
       run: cd ~; find -name 'artefacts-*.tar.gz' -exec tar -xzf '{}' \;
-    - name: Install Atheme
-      run: sudo apt-get install atheme-services
+    - name: Install system dependencies
+      run: sudo apt-get install atheme-services faketime
     - name: Install irctest dependencies
       run: |-
         python -m pip install --upgrade pip
@@ -1243,8 +1243,8 @@ jobs:
         path: '~'
     - name: Unpack artefacts
       run: cd ~; find -name 'artefacts-*.tar.gz' -exec tar -xzf '{}' \;
-    - name: Install Atheme
-      run: sudo apt-get install atheme-services
+    - name: Install system dependencies
+      run: sudo apt-get install atheme-services faketime
     - name: Install irctest dependencies
       run: |-
         python -m pip install --upgrade pip
diff --git a/Makefile b/Makefile
index e933806..0c82a97 100644
--- a/Makefile
+++ b/Makefile
@@ -101,6 +101,7 @@ SOPEL_SELECTORS := \
 # Tests marked with arbitrary_client_tags can't pass because Unreal whitelists which tags it relays
 # Tests marked with react_tag can't pass because Unreal blocks +draft/react https://github.com/unrealircd/unrealircd/pull/149
 # Tests marked with private_chathistory can't pass because Unreal does not implement CHATHISTORY for DMs
+
 UNREALIRCD_SELECTORS := \
 	not Ergo \
 	and not deprecated \
diff --git a/README.md b/README.md
index 7aac195..18edbc5 100644
--- a/README.md
+++ b/README.md
@@ -18,6 +18,7 @@ have no side effect.
 Install irctest and dependencies:
 
 ```
+sudo apt install faketime  # Optional, but greatly speeds up irctest/server_tests/list.py
 cd ~
 git clone https://github.com/ProgVal/irctest.git
 cd irctest
diff --git a/irctest/basecontrollers.py b/irctest/basecontrollers.py
index b1464ac..e8680b3 100644
--- a/irctest/basecontrollers.py
+++ b/irctest/basecontrollers.py
@@ -189,6 +189,10 @@ class BaseServerController(_BaseController):
     """Character used for the 'mute' extban"""
     nickserv = "NickServ"
 
+    def __init__(self, *args: Any, **kwargs: Any):
+        super().__init__(*args, **kwargs)
+        self.faketime_enabled = False
+
     def get_hostname_and_port(self) -> Tuple[str, int]:
         return find_hostname_and_port()
 
@@ -202,6 +206,7 @@ class BaseServerController(_BaseController):
         run_services: bool,
         valid_metadata_keys: Optional[Set[str]],
         invalid_metadata_keys: Optional[Set[str]],
+        faketime: Optional[str],
     ) -> None:
         raise NotImplementedError()
 
diff --git a/irctest/cases.py b/irctest/cases.py
index cc15916..9a7056d 100644
--- a/irctest/cases.py
+++ b/irctest/cases.py
@@ -508,6 +508,12 @@ class BaseServerTestCase(
     server_support: Optional[Dict[str, Optional[str]]]
     run_services = False
 
+    faketime: Optional[str] = None
+    """If not None and the controller supports it and libfaketime is available,
+    runs the server using faketime and this value set as the $FAKETIME env variable.
+    Tests must check ``self.controller.faketime_enabled`` is True before
+    relying on this."""
+
     __new__ = object.__new__  # pytest won't collect Generic[] subclasses otherwise
 
     def setUp(self) -> None:
@@ -522,6 +528,7 @@ class BaseServerTestCase(
             invalid_metadata_keys=self.invalid_metadata_keys,
             ssl=self.ssl,
             run_services=self.run_services,
+            faketime=self.faketime,
         )
         self.clients: Dict[TClientName, client_mock.ClientMock] = {}
 
diff --git a/irctest/controllers/bahamut.py b/irctest/controllers/bahamut.py
index 01cd4dd..6a23aaa 100644
--- a/irctest/controllers/bahamut.py
+++ b/irctest/controllers/bahamut.py
@@ -102,6 +102,7 @@ class BahamutController(BaseServerController, DirectoryBasedController):
         valid_metadata_keys: Optional[Set[str]] = None,
         invalid_metadata_keys: Optional[Set[str]] = None,
         restricted_metadata_keys: Optional[Set[str]] = None,
+        faketime: Optional[str],
     ) -> None:
         if valid_metadata_keys or invalid_metadata_keys:
             raise NotImplementedByController(
@@ -136,15 +137,21 @@ class BahamutController(BaseServerController, DirectoryBasedController):
                     # pem_path=self.pem_path,
                 )
             )
+
+        if faketime and shutil.which("faketime"):
+            faketime_cmd = ["faketime", "-f", faketime]
+            self.faketime_enabled = True
+        else:
+            faketime_cmd = []
+
         self.proc = subprocess.Popen(
             [
-                # "strace", "-f", "-e", "file",
+                *faketime_cmd,
                 "ircd",
                 "-t",  # don't fork
                 "-f",
                 os.path.join(self.directory, "server.conf"),
             ],
-            # stdout=subprocess.DEVNULL,
         )
 
         if run_services:
diff --git a/irctest/controllers/base_hybrid.py b/irctest/controllers/base_hybrid.py
index f91229a..e2c0418 100644
--- a/irctest/controllers/base_hybrid.py
+++ b/irctest/controllers/base_hybrid.py
@@ -1,4 +1,5 @@
 import os
+import shutil
 import subprocess
 from typing import Optional, Set
 
@@ -43,6 +44,7 @@ class BaseHybridController(BaseServerController, DirectoryBasedController):
         run_services: bool,
         valid_metadata_keys: Optional[Set[str]] = None,
         invalid_metadata_keys: Optional[Set[str]] = None,
+        faketime: Optional[str],
     ) -> None:
         if valid_metadata_keys or invalid_metadata_keys:
             raise NotImplementedByController(
@@ -73,8 +75,16 @@ class BaseHybridController(BaseServerController, DirectoryBasedController):
                 )
             )
         assert self.directory
+
+        if faketime and shutil.which("faketime"):
+            faketime_cmd = ["faketime", "-f", faketime]
+            self.faketime_enabled = True
+        else:
+            faketime_cmd = []
+
         self.proc = subprocess.Popen(
             [
+                *faketime_cmd,
                 self.binary_name,
                 "-foreground",
                 "-configfile",
diff --git a/irctest/controllers/ergo.py b/irctest/controllers/ergo.py
index d6e80ab..3878e7b 100644
--- a/irctest/controllers/ergo.py
+++ b/irctest/controllers/ergo.py
@@ -1,6 +1,7 @@
 import copy
 import json
 import os
+import shutil
 import subprocess
 from typing import Any, Dict, Optional, Set, Type, Union
 
@@ -155,6 +156,7 @@ class ErgoController(BaseServerController, DirectoryBasedController):
         valid_metadata_keys: Optional[Set[str]] = None,
         invalid_metadata_keys: Optional[Set[str]] = None,
         restricted_metadata_keys: Optional[Set[str]] = None,
+        faketime: Optional[str],
         config: Optional[Any] = None,
     ) -> None:
         if valid_metadata_keys or invalid_metadata_keys:
@@ -202,8 +204,15 @@ class ErgoController(BaseServerController, DirectoryBasedController):
         self._write_config()
         subprocess.call(["ergo", "initdb", "--conf", self._config_path, "--quiet"])
         subprocess.call(["ergo", "mkcerts", "--conf", self._config_path, "--quiet"])
+
+        if faketime and shutil.which("faketime"):
+            faketime_cmd = ["faketime", "-f", faketime]
+            self.faketime_enabled = True
+        else:
+            faketime_cmd = []
+
         self.proc = subprocess.Popen(
-            ["ergo", "run", "--conf", self._config_path, "--quiet"]
+            [*faketime_cmd, "ergo", "run", "--conf", self._config_path, "--quiet"]
         )
 
     def wait_for_services(self) -> None:
diff --git a/irctest/controllers/external_server.py b/irctest/controllers/external_server.py
index 5ecbae0..e8c822a 100644
--- a/irctest/controllers/external_server.py
+++ b/irctest/controllers/external_server.py
@@ -42,6 +42,7 @@ class ExternalServerController(BaseServerController):
         valid_metadata_keys: Optional[Set[str]] = None,
         invalid_metadata_keys: Optional[Set[str]] = None,
         restricted_metadata_keys: Optional[Set[str]] = None,
+        faketime: Optional[str],
     ) -> None:
         pass
 
diff --git a/irctest/controllers/inspircd.py b/irctest/controllers/inspircd.py
index 402a10b..2f71c1a 100644
--- a/irctest/controllers/inspircd.py
+++ b/irctest/controllers/inspircd.py
@@ -1,4 +1,5 @@
 import os
+import shutil
 import subprocess
 from typing import Optional, Set, Type
 
@@ -114,6 +115,7 @@ class InspircdController(BaseServerController, DirectoryBasedController):
         valid_metadata_keys: Optional[Set[str]] = None,
         invalid_metadata_keys: Optional[Set[str]] = None,
         restricted_metadata_keys: Optional[Set[str]] = None,
+        faketime: Optional[str] = None,
     ) -> None:
         if valid_metadata_keys or invalid_metadata_keys:
             raise NotImplementedByController(
@@ -147,8 +149,16 @@ class InspircdController(BaseServerController, DirectoryBasedController):
                 )
             )
         assert self.directory
+
+        if faketime and shutil.which("faketime"):
+            faketime_cmd = ["faketime", "-f", faketime]
+            self.faketime_enabled = True
+        else:
+            faketime_cmd = []
+
         self.proc = subprocess.Popen(
             [
+                *faketime_cmd,
                 "inspircd",
                 "--nofork",
                 "--config",
diff --git a/irctest/controllers/irc2.py b/irctest/controllers/irc2.py
index 8006ea6..69a5fb0 100644
--- a/irctest/controllers/irc2.py
+++ b/irctest/controllers/irc2.py
@@ -1,4 +1,5 @@
 import os
+import shutil
 import subprocess
 from typing import Optional, Set, Type
 
@@ -51,6 +52,7 @@ class Irc2Controller(BaseServerController, DirectoryBasedController):
         run_services: bool,
         valid_metadata_keys: Optional[Set[str]] = None,
         invalid_metadata_keys: Optional[Set[str]] = None,
+        faketime: Optional[str],
     ) -> None:
         if valid_metadata_keys or invalid_metadata_keys:
             raise NotImplementedByController(
@@ -76,8 +78,16 @@ class Irc2Controller(BaseServerController, DirectoryBasedController):
                     pidfile=pidfile,
                 )
             )
+
+        if faketime and shutil.which("faketime"):
+            faketime_cmd = ["faketime", "-f", faketime]
+            self.faketime_enabled = True
+        else:
+            faketime_cmd = []
+
         self.proc = subprocess.Popen(
             [
+                *faketime_cmd,
                 "ircd",
                 "-s",  # no iauth
                 "-p",
diff --git a/irctest/controllers/ircu2.py b/irctest/controllers/ircu2.py
index 6bf9916..2be36f7 100644
--- a/irctest/controllers/ircu2.py
+++ b/irctest/controllers/ircu2.py
@@ -1,4 +1,5 @@
 import os
+import shutil
 import subprocess
 from typing import Optional, Set, Type
 
@@ -70,6 +71,7 @@ class Ircu2Controller(BaseServerController, DirectoryBasedController):
         run_services: bool,
         valid_metadata_keys: Optional[Set[str]] = None,
         invalid_metadata_keys: Optional[Set[str]] = None,
+        faketime: Optional[str],
     ) -> None:
         if valid_metadata_keys or invalid_metadata_keys:
             raise NotImplementedByController(
@@ -95,8 +97,16 @@ class Ircu2Controller(BaseServerController, DirectoryBasedController):
                     pidfile=pidfile,
                 )
             )
+
+        if faketime and shutil.which("faketime"):
+            faketime_cmd = ["faketime", "-f", faketime]
+            self.faketime_enabled = True
+        else:
+            faketime_cmd = []
+
         self.proc = subprocess.Popen(
             [
+                *faketime_cmd,
                 "ircd",
                 "-n",  # don't detach
                 "-f",
diff --git a/irctest/controllers/mammon.py b/irctest/controllers/mammon.py
index c437139..591347e 100644
--- a/irctest/controllers/mammon.py
+++ b/irctest/controllers/mammon.py
@@ -1,4 +1,5 @@
 import os
+import shutil
 import subprocess
 from typing import Optional, Set, Type
 
@@ -92,6 +93,7 @@ class MammonController(BaseServerController, DirectoryBasedController):
         valid_metadata_keys: Optional[Set[str]] = None,
         invalid_metadata_keys: Optional[Set[str]] = None,
         restricted_metadata_keys: Optional[Set[str]] = None,
+        faketime: Optional[str],
     ) -> None:
         if password is not None:
             raise NotImplementedByController("PASS command")
@@ -113,8 +115,16 @@ class MammonController(BaseServerController, DirectoryBasedController):
         # with self.open_file('server.yml', 'r') as fd:
         #    print(fd.read())
         assert self.directory
+
+        if faketime and shutil.which("faketime"):
+            faketime_cmd = ["faketime", "-f", faketime]
+            self.faketime_enabled = True
+        else:
+            faketime_cmd = []
+
         self.proc = subprocess.Popen(
             [
+                *faketime_cmd,
                 "mammond",
                 "--nofork",  # '--debug',
                 "--config",
diff --git a/irctest/controllers/ngircd.py b/irctest/controllers/ngircd.py
index e296899..50577dd 100644
--- a/irctest/controllers/ngircd.py
+++ b/irctest/controllers/ngircd.py
@@ -1,4 +1,5 @@
 import os
+import shutil
 import subprocess
 from typing import Optional, Set, Type
 
@@ -56,6 +57,7 @@ class NgircdController(BaseServerController, DirectoryBasedController):
         valid_metadata_keys: Optional[Set[str]] = None,
         invalid_metadata_keys: Optional[Set[str]] = None,
         restricted_metadata_keys: Optional[Set[str]] = None,
+        faketime: Optional[str],
     ) -> None:
         if valid_metadata_keys or invalid_metadata_keys:
             raise NotImplementedByController(
@@ -81,6 +83,7 @@ class NgircdController(BaseServerController, DirectoryBasedController):
             fd.write("\n")
 
         assert self.directory
+
         with self.open_file("server.conf") as fd:
             fd.write(
                 TEMPLATE_CONFIG.format(
@@ -94,8 +97,16 @@ class NgircdController(BaseServerController, DirectoryBasedController):
                     empty_file=os.path.join(self.directory, "empty.txt"),
                 )
             )
+
+        if faketime and shutil.which("faketime"):
+            faketime_cmd = ["faketime", "-f", faketime]
+            self.faketime_enabled = True
+        else:
+            faketime_cmd = []
+
         self.proc = subprocess.Popen(
             [
+                *faketime_cmd,
                 "ngircd",
                 "--nodaemon",
                 "--config",
diff --git a/irctest/controllers/snircd.py b/irctest/controllers/snircd.py
index 7fa9acc..2edb85c 100644
--- a/irctest/controllers/snircd.py
+++ b/irctest/controllers/snircd.py
@@ -1,4 +1,5 @@
 import os
+import shutil
 import subprocess
 from typing import Optional, Set, Type
 
@@ -69,6 +70,7 @@ class SnircdController(BaseServerController, DirectoryBasedController):
         run_services: bool,
         valid_metadata_keys: Optional[Set[str]] = None,
         invalid_metadata_keys: Optional[Set[str]] = None,
+        faketime: Optional[str],
     ) -> None:
         if valid_metadata_keys or invalid_metadata_keys:
             raise NotImplementedByController(
@@ -94,8 +96,16 @@ class SnircdController(BaseServerController, DirectoryBasedController):
                     pidfile=pidfile,
                 )
             )
+
+        if faketime and shutil.which("faketime"):
+            faketime_cmd = ["faketime", "-f", faketime]
+            self.faketime_enabled = True
+        else:
+            faketime_cmd = []
+
         self.proc = subprocess.Popen(
             [
+                *faketime_cmd,
                 "ircd",
                 "-n",  # don't detach
                 "-f",
diff --git a/irctest/controllers/unrealircd.py b/irctest/controllers/unrealircd.py
index 529ed80..a24bcc0 100644
--- a/irctest/controllers/unrealircd.py
+++ b/irctest/controllers/unrealircd.py
@@ -156,6 +156,7 @@ class UnrealircdController(BaseServerController, DirectoryBasedController):
         valid_metadata_keys: Optional[Set[str]] = None,
         invalid_metadata_keys: Optional[Set[str]] = None,
         restricted_metadata_keys: Optional[Set[str]] = None,
+        faketime: Optional[str],
     ) -> None:
         if valid_metadata_keys or invalid_metadata_keys:
             raise NotImplementedByController(
@@ -192,6 +193,7 @@ class UnrealircdController(BaseServerController, DirectoryBasedController):
             fd.write("\n")
 
         assert self.directory
+
         with self.open_file("unrealircd.conf") as fd:
             fd.write(
                 TEMPLATE_CONFIG.format(
@@ -225,9 +227,16 @@ class UnrealircdController(BaseServerController, DirectoryBasedController):
                 proot_cmd = ["proot", "-b", f"{tmpdir}:{unrealircd_prefix}/tmp"]
                 self.using_proot = True
 
+        if faketime and shutil.which("faketime"):
+            faketime_cmd = ["faketime", "-f", faketime]
+            self.faketime_enabled = True
+        else:
+            faketime_cmd = []
+
         self.proc = subprocess.Popen(
             [
                 *proot_cmd,
+                *faketime_cmd,
                 "unrealircd",
                 "-t",
                 "-F",  # BOOT_NOFORK
diff --git a/irctest/numerics.py b/irctest/numerics.py
index 28006fe..8aafb08 100644
--- a/irctest/numerics.py
+++ b/irctest/numerics.py
@@ -66,6 +66,7 @@ RPL_WHOISIDLE = "317"
 RPL_ENDOFWHOIS = "318"
 RPL_WHOISCHANNELS = "319"
 RPL_WHOISSPECIAL = "320"
+RPL_LISTSTART = "321"
 RPL_LIST = "322"
 RPL_LISTEND = "323"
 RPL_CHANNELMODEIS = "324"
diff --git a/irctest/server_tests/list.py b/irctest/server_tests/list.py
index 7a902e3..2649076 100644
--- a/irctest/server_tests/list.py
+++ b/irctest/server_tests/list.py
@@ -3,39 +3,60 @@ The LIST command  (`RFC 1459
 <https://datatracker.ietf.org/doc/html/rfc1459#section-4.2.6>`__,
 `RFC 2812 <https://datatracker.ietf.org/doc/html/rfc2812#section-3.2.6>`__,
 `Modern <https://modern.ircdocs.horse/#list-message>`__)
-
-TODO: check with Modern
 """
 
+import time
+
+
 from irctest import cases
 
+from irctest import cases, runner
+from irctest.numerics import RPL_LIST, RPL_LISTEND, RPL_LISTSTART
 
-class ListTestCase(cases.BaseServerTestCase):
+
+class _BasedListTestCase(cases.BaseServerTestCase):
+    def _parseChanList(self, client):
+        channels = set()
+        while True:
+            m = self.getMessage(client)
+            if m.command == RPL_LISTEND:
+                break
+            if m.command == RPL_LIST:
+                if m.params[1].startswith("&"):
+                    # skip local pseudo-channels listed by ngircd and ircu
+                    continue
+                channels.add(m.params[1])
+
+        return channels
+
+
+class ListTestCase(_BasedListTestCase):
     @cases.mark_specifications("RFC1459", "RFC2812")
     @cases.xfailIfSoftware(["irc2"], "irc2 deprecated LIST")
     def testListEmpty(self):
         """<https://tools.ietf.org/html/rfc1459#section-4.2.6>
         <https://tools.ietf.org/html/rfc2812#section-3.2.6>
+        <https://modern.ircdocs.horse/#list-message>
         """
         self.connectClient("foo")
         self.connectClient("bar")
         self.getMessages(1)
         self.sendLine(2, "LIST")
         m = self.getMessage(2)
-        if m.command == "321":
-            # skip RPL_LISTSTART
+        if m.command == RPL_LISTSTART:
+            # skip
             m = self.getMessage(2)
         # skip local pseudo-channels listed by ngircd and ircu
-        while m.command == "322" and m.params[1].startswith("&"):
+        while m.command == RPL_LIST and m.params[1].startswith("&"):
             m = self.getMessage(2)
         self.assertNotEqual(
             m.command,
-            "322",  # RPL_LIST
+            RPL_LIST,
             "LIST response gives (at least) one channel, whereas there " "is none.",
         )
         self.assertMessageMatch(
             m,
-            command="323",  # RPL_LISTEND
+            command=RPL_LISTEND,
             fail_msg="Second reply to LIST is not 322 (RPL_LIST) "
             "or 323 (RPL_LISTEND), or but: {msg}",
         )
@@ -46,6 +67,8 @@ class ListTestCase(cases.BaseServerTestCase):
         """When a channel exists, LIST should get it in a reply.
         <https://tools.ietf.org/html/rfc1459#section-4.2.6>
         <https://tools.ietf.org/html/rfc2812#section-3.2.6>
+
+        <https://modern.ircdocs.horse/#list-message>
         """
         self.connectClient("foo")
         self.connectClient("bar")
@@ -53,34 +76,335 @@ class ListTestCase(cases.BaseServerTestCase):
         self.getMessages(1)
         self.sendLine(2, "LIST")
         m = self.getMessage(2)
-        if m.command == "321":
-            # skip RPL_LISTSTART
+        if m.command == RPL_LISTSTART:
+            # skip
             m = self.getMessage(2)
         self.assertNotEqual(
             m.command,
-            "323",  # RPL_LISTEND
+            RPL_LISTEND,
             fail_msg="LIST response ended (ie. 323, aka RPL_LISTEND) "
             "without listing any channel, whereas there is one.",
         )
         self.assertMessageMatch(
             m,
-            command="322",  # RPL_LIST
+            command=RPL_LIST,
             fail_msg="Second reply to LIST is not 322 (RPL_LIST), "
             "nor 323 (RPL_LISTEND) but: {msg}",
         )
         m = self.getMessage(2)
         # skip local pseudo-channels listed by ngircd and ircu
-        while m.command == "322" and m.params[1].startswith("&"):
+        while m.command == RPL_LIST and m.params[1].startswith("&"):
             m = self.getMessage(2)
         self.assertNotEqual(
             m.command,
-            "322",  # RPL_LIST
+            RPL_LIST,
             fail_msg="LIST response gives (at least) two channels, "
             "whereas there is only one.",
         )
         self.assertMessageMatch(
             m,
-            command="323",  # RPL_LISTEND
+            command=RPL_LISTEND,
             fail_msg="Third reply to LIST is not 322 (RPL_LIST) "
             "or 323 (RPL_LISTEND), or but: {msg}",
         )
+
+    @cases.mark_isupport("ELIST")
+    @cases.mark_specifications("Modern")
+    def testListMask(self):
+        """
+        "M: Searching based on mask."
+        -- <https://modern.ircdocs.horse/#elist-parameter>
+        -- https://datatracker.ietf.org/doc/html/draft-hardy-irc-isupport-00#section-4.8
+        """
+        self.connectClient("foo")
+
+        if "M" not in self.server_support.get("ELIST", ""):
+            raise runner.OptionalExtensionNotSupported("ELIST=M")
+
+        self.connectClient("bar")
+        self.sendLine(1, "JOIN #chan1")
+        self.getMessages(1)
+        self.sendLine(1, "JOIN #chan2")
+        self.getMessages(1)
+
+        self.sendLine(2, "LIST *an1")
+        self.assertEqual(self._parseChanList(2), {"#chan1"})
+
+        self.sendLine(2, "LIST *an2")
+        self.assertEqual(self._parseChanList(2), {"#chan2"})
+
+        self.sendLine(2, "LIST #c*n2")
+        self.assertEqual(self._parseChanList(2), {"#chan2"})
+
+        self.sendLine(2, "LIST *an3")
+        self.assertEqual(self._parseChanList(2), set())
+
+        self.sendLine(2, "LIST #ch*")
+        self.assertEqual(self._parseChanList(2), {"#chan1", "#chan2"})
+
+    @cases.mark_isupport("ELIST")
+    @cases.mark_specifications("Modern")
+    def testListNotMask(self):
+        """
+        " N: Searching based on a non-matching mask. i.e., the opposite of M."
+        -- <https://modern.ircdocs.horse/#elist-parameter>
+        -- https://datatracker.ietf.org/doc/html/draft-hardy-irc-isupport-00#section-4.8
+        """
+        self.connectClient("foo")
+
+        if "N" not in self.server_support.get("ELIST", ""):
+            raise runner.OptionalExtensionNotSupported("ELIST=N")
+
+        self.sendLine(1, "JOIN #chan1")
+        self.getMessages(1)
+        self.sendLine(1, "JOIN #chan2")
+        self.getMessages(1)
+
+        self.connectClient("bar")
+
+        self.sendLine(2, "LIST !*an1")
+        self.assertEqual(self._parseChanList(2), {"#chan2"})
+
+        self.sendLine(2, "LIST !*an2")
+        self.assertEqual(self._parseChanList(2), {"#chan1"})
+
+        self.sendLine(2, "LIST !#c*n2")
+        self.assertEqual(self._parseChanList(2), {"#chan1"})
+
+        self.sendLine(2, "LIST !*an3")
+        self.assertEqual(self._parseChanList(2), {"#chan1", "#chan2"})
+
+        self.sendLine(2, "LIST !#ch*")
+        self.assertEqual(self._parseChanList(2), set())
+
+    @cases.mark_isupport("ELIST")
+    @cases.mark_specifications("Modern")
+    def testListUsers(self):
+        """
+        "U: Searching based on user count within the channel, via the "<val" and
+        ">val" modifiers to search for a channel that has less or more than val users,
+        respectively."
+        -- <https://modern.ircdocs.horse/#elist-parameter>
+        -- https://datatracker.ietf.org/doc/html/draft-hardy-irc-isupport-00#section-4.8
+        """
+        self.connectClient("foo")
+
+        if "M" not in self.server_support.get("ELIST", ""):
+            raise runner.OptionalExtensionNotSupported("ELIST=M")
+
+        self.sendLine(1, "JOIN #chan1")
+        self.getMessages(1)
+        self.sendLine(1, "JOIN #chan2")
+        self.getMessages(1)
+
+        self.connectClient("bar")
+        self.sendLine(2, "JOIN #chan2")
+        self.getMessages(2)
+
+        self.connectClient("baz")
+
+        self.sendLine(3, "LIST >0")
+        self.assertEqual(self._parseChanList(3), {"#chan1", "#chan2"})
+
+        self.sendLine(3, "LIST <1")
+        self.assertEqual(self._parseChanList(3), set())
+
+        self.sendLine(3, "LIST <100")
+        self.assertEqual(self._parseChanList(3), {"#chan1", "#chan2"})
+
+        self.sendLine(3, "LIST >1")
+        self.assertEqual(self._parseChanList(3), {"#chan2"})
+
+        self.sendLine(3, "LIST <2")
+        self.assertEqual(self._parseChanList(3), {"#chan1"})
+
+        self.sendLine(3, "LIST <100")
+        self.assertEqual(self._parseChanList(3), {"#chan1", "#chan2"})
+
+
+class FaketimeListTestCase(_BasedListTestCase):
+    faketime = "+1y x30"  # for every wall clock second, 1 minute passed for the server
+
+    def _sleep_minutes(self, n):
+        for _ in range(n):
+            if self.controller.faketime_enabled:
+                # From the server's point of view, 1 min will pass
+                time.sleep(2)
+            else:
+                time.sleep(60)
+
+            # reply to pings
+            self.getMessages(1)
+            self.getMessages(2)
+
+    @cases.mark_isupport("ELIST")
+    @cases.mark_specifications("Modern")
+    def testListCreationTime(self):
+        """
+        " C: Searching based on channel creation time, via the "C<val" and "C>val"
+        modifiers to search for a channel creation time that is higher or lower
+        than val."
+        -- <https://modern.ircdocs.horse/#elist-parameter>
+        -- https://datatracker.ietf.org/doc/html/draft-hardy-irc-isupport-00#section-4.8
+
+        Unfortunately, this is ambiguous, because "val" is a time delta (in minutes),
+        not a timestamp.
+
+        On InspIRCd and Charybdis/Solanum, "C<val" is interpreted as "the channel was
+        created less than <val> minutes ago
+
+        On UnrealIRCd, Plexus, and Hybrid, it is interpreted as "the channel's creation
+        time is a timestamp lower than <val> minutes ago" (ie. the exact opposite)
+
+        "C: Searching based on channel creation time, via the "C<val" and "C>val"
+        modifiers to search for a channel that was created either less than `val`
+        minutes ago, or more than `val` minutes ago, respectively"
+        -- https://github.com/ircdocs/modern-irc/pull/171
+        """
+        self.connectClient("foo")
+
+        if "C" not in self.server_support.get("ELIST", ""):
+            raise runner.OptionalExtensionNotSupported("ELIST=C")
+
+        self.connectClient("bar")
+        self.sendLine(1, "JOIN #chan1")
+        self.getMessages(1)
+
+        # Helps debugging
+        self.sendLine(1, "TIME")
+        self.getMessages(1)
+
+        self._sleep_minutes(2)
+
+        # Helps debugging
+        self.sendLine(1, "TIME")
+        self.getMessages(1)
+
+        self.sendLine(1, "JOIN #chan2")
+        self.getMessages(1)
+
+        self._sleep_minutes(1)
+
+        if self.controller.software_name in ("UnrealIRCd", "Plexus4", "Hybrid"):
+            self.sendLine(2, "LIST C<2")
+            self.assertEqual(self._parseChanList(2), {"#chan1"})
+
+            self.sendLine(2, "LIST C>2")
+            self.assertEqual(self._parseChanList(2), {"#chan2"})
+
+            self.sendLine(2, "LIST C>0")
+            self.assertEqual(self._parseChanList(2), set())
+
+            self.sendLine(2, "LIST C<0")
+            self.assertEqual(self._parseChanList(2), {"#chan1", "#chan2"})
+
+            self.sendLine(2, "LIST C>10")
+            self.assertEqual(self._parseChanList(2), {"#chan1", "#chan2"})
+        elif self.controller.software_name in ("Solanum", "Charybdis", "InspIRCd"):
+            self.sendLine(2, "LIST C>2")
+            self.assertEqual(self._parseChanList(2), {"#chan1"})
+
+            self.sendLine(2, "LIST C<2")
+            self.assertEqual(self._parseChanList(2), {"#chan2"})
+
+            self.sendLine(2, "LIST C<0")
+            if self.controller.software_name == "InspIRCd":
+                self.assertEqual(self._parseChanList(2), {"#chan1", "#chan2"})
+            else:
+                self.assertEqual(self._parseChanList(2), set())
+
+            self.sendLine(2, "LIST C>0")
+            self.assertEqual(self._parseChanList(2), {"#chan1", "#chan2"})
+
+            self.sendLine(2, "LIST C<10")
+            self.assertEqual(self._parseChanList(2), {"#chan1", "#chan2"})
+        else:
+            assert False, f"{self.controller.software_name} not supported"
+
+    @cases.mark_isupport("ELIST")
+    @cases.mark_specifications("Modern")
+    def testListTopicTime(self):
+        """
+        "T: Searching based on topic time, via the "T<val" and "T>val"
+        modifiers to search for a topic time that is lower or higher than
+        val respectively."
+        -- <https://modern.ircdocs.horse/#elist-parameter>
+        -- https://datatracker.ietf.org/doc/html/draft-hardy-irc-isupport-00#section-4.8
+
+        See testListCreationTime's docstring for comments on this.
+
+        "T: Searching based on topic set time, via the "T<val" and "T>val" modifiers
+        to search for a topic time that was set less than `val` minutes ago, or more
+        than `val` minutes ago, respectively."
+        -- https://github.com/ircdocs/modern-irc/pull/171
+        """
+        self.connectClient("foo")
+
+        if "T" not in self.server_support.get("ELIST", ""):
+            raise runner.OptionalExtensionNotSupported("ELIST=T")
+
+        self.connectClient("bar")
+        self.sendLine(1, "JOIN #chan1")
+        self.sendLine(1, "JOIN #chan2")
+        self.getMessages(1)
+
+        self.sendLine(1, "TOPIC #chan1 :First channel")
+        self.getMessages(1)
+
+        # Helps debugging
+        self.sendLine(1, "TIME")
+        self.getMessages(1)
+
+        self._sleep_minutes(2)
+
+        # Helps debugging
+        self.sendLine(1, "TIME")
+        self.getMessages(1)
+
+        self.sendLine(1, "TOPIC #chan2 :Second channel")
+        self.getMessages(1)
+
+        self._sleep_minutes(1)
+
+        if self.controller.software_name in ("UnrealIRCd",):
+            self.sendLine(1, "LIST T<2")
+            self.assertEqual(self._parseChanList(1), {"#chan1"})
+
+            self.sendLine(1, "LIST T>2")
+            self.assertEqual(self._parseChanList(1), {"#chan2"})
+
+            self.sendLine(1, "LIST T>0")
+            self.assertEqual(self._parseChanList(1), set())
+
+            self.sendLine(1, "LIST T<0")
+            self.assertEqual(self._parseChanList(1), {"#chan1", "#chan2"})
+
+            self.sendLine(1, "LIST T>10")
+            self.assertEqual(self._parseChanList(1), {"#chan1", "#chan2"})
+        elif self.controller.software_name in (
+            "Solanum",
+            "Charybdis",
+            "InspIRCd",
+            "Plexus4",
+            "Hybrid",
+        ):
+            self.sendLine(1, "LIST T>2")
+            self.assertEqual(self._parseChanList(1), {"#chan1"})
+
+            self.sendLine(1, "LIST T<2")
+            self.assertEqual(self._parseChanList(1), {"#chan2"})
+
+            self.sendLine(1, "LIST T<0")
+            if self.controller.software_name == "InspIRCd":
+                # Insp internally represents "LIST T>0" like "LIST"
+                self.assertEqual(self._parseChanList(1), {"#chan1", "#chan2"})
+            else:
+                self.assertEqual(self._parseChanList(1), set())
+
+            self.sendLine(1, "LIST T>0")
+            self.assertEqual(self._parseChanList(1), {"#chan1", "#chan2"})
+
+            self.sendLine(1, "LIST T<10")
+            self.assertEqual(self._parseChanList(1), {"#chan1", "#chan2"})
+        else:
+            assert False, f"{self.controller.software_name} not supported"
diff --git a/irctest/specifications.py b/irctest/specifications.py
index 8a629c7..16257fa 100644
--- a/irctest/specifications.py
+++ b/irctest/specifications.py
@@ -50,6 +50,7 @@ class Capabilities(enum.Enum):
 @enum.unique
 class IsupportTokens(enum.Enum):
     BOT = "BOT"
+    ELIST = "ELIST"
     PREFIX = "PREFIX"
     MONITOR = "MONITOR"
     STATUSMSG = "STATUSMSG"
diff --git a/make_workflows.py b/make_workflows.py
index 62ab72b..6d95675 100644
--- a/make_workflows.py
+++ b/make_workflows.py
@@ -208,8 +208,8 @@ def get_test_job(*, config, test_config, test_id, version_flavor, jobs):
             *unpack,
             *install_steps,
             {
-                "name": "Install Atheme",
-                "run": "sudo apt-get install atheme-services",
+                "name": "Install system dependencies",
+                "run": "sudo apt-get install atheme-services faketime",
             },
             {
                 "name": "Install irctest dependencies",
diff --git a/pytest.ini b/pytest.ini
index 2aa6a82..1bebd29 100644
--- a/pytest.ini
+++ b/pytest.ini
@@ -32,6 +32,7 @@ markers =
 
     # isupport tokens
     BOT
+    ELIST
     MONITOR
     PREFIX
     STATUSMSG