diff --git a/tests/run-tests.py b/tests/run-tests.py
--- a/tests/run-tests.py
+++ b/tests/run-tests.py
@@ -950,10 +950,6 @@ class Test(unittest.TestCase):
         hgrc.write(b'mergemarkers = detailed\n')
         hgrc.write(b'promptecho = True\n')
         hgrc.write(b'[defaults]\n')
-        hgrc.write(b'backout = -d "0 0"\n')
-        hgrc.write(b'commit = -d "0 0"\n')
-        hgrc.write(b'shelve = --date "0 0"\n')
-        hgrc.write(b'tag = -d "0 0"\n')
         hgrc.write(b'[devel]\n')
         hgrc.write(b'all-warnings = true\n')
         hgrc.write(b'default-date = 0 0\n')
diff --git a/tests/test-basic.t b/tests/test-basic.t
--- a/tests/test-basic.t
+++ b/tests/test-basic.t
@@ -1,10 +1,6 @@
 Create a repository:
 
   $ hg config
-  defaults.backout=-d "0 0"
-  defaults.commit=-d "0 0"
-  defaults.shelve=--date "0 0"
-  defaults.tag=-d "0 0"
   devel.all-warnings=true
   devel.default-date=0 0
   largefiles.usercache=$TESTTMP/.cache/largefiles (glob)
diff --git a/tests/test-commandserver.t b/tests/test-commandserver.t
--- a/tests/test-commandserver.t
+++ b/tests/test-commandserver.t
@@ -187,10 +187,6 @@ check that local configs for the cached 
   ...     runcommand(server, ['-R', 'foo', 'showconfig', 'ui', 'defaults'])
   *** runcommand showconfig
   bundle.mainreporoot=$TESTTMP/repo
-  defaults.backout=-d "0 0"
-  defaults.commit=-d "0 0"
-  defaults.shelve=--date "0 0"
-  defaults.tag=-d "0 0"
   devel.all-warnings=true
   devel.default-date=0 0
   largefiles.usercache=$TESTTMP/.cache/largefiles
@@ -204,10 +200,6 @@ check that local configs for the cached 
   web\.ipv6=(?:True|False) (re)
   *** runcommand init foo
   *** runcommand -R foo showconfig ui defaults
-  defaults.backout=-d "0 0"
-  defaults.commit=-d "0 0"
-  defaults.shelve=--date "0 0"
-  defaults.tag=-d "0 0"
   ui.slash=True
   ui.interactive=False
   ui.mergemarkers=detailed