diff --git a/mercurial/commands.py b/mercurial/commands.py
--- a/mercurial/commands.py
+++ b/mercurial/commands.py
@@ -1865,22 +1865,6 @@ def copy(ui, repo, *pats, **opts):
     with repo.wlock(False):
         return cmdutil.copy(ui, repo, pats, opts)
 
-@command('debugdate',
-    [('e', 'extended', None, _('try extended date formats'))],
-    _('[-e] DATE [RANGE]'),
-    norepo=True, optionalrepo=True)
-def debugdate(ui, date, range=None, **opts):
-    """parse and display a date"""
-    if opts["extended"]:
-        d = util.parsedate(date, util.extendeddateformats)
-    else:
-        d = util.parsedate(date)
-    ui.write(("internal: %s %s\n") % d)
-    ui.write(("standard: %s\n") % util.datestr(d))
-    if range:
-        m = util.matchdate(range)
-        ui.write(("match: %s\n") % m(d[0]))
-
 @command('debugdiscovery',
     [('', 'old', None, _('use old-style discovery')),
     ('', 'nonheads', None,
diff --git a/mercurial/debugcommands.py b/mercurial/debugcommands.py
--- a/mercurial/debugcommands.py
+++ b/mercurial/debugcommands.py
@@ -28,6 +28,7 @@ from . import (
     scmutil,
     simplemerge,
     streamclone,
+    util,
 )
 
 release = lockmod.release
@@ -434,3 +435,19 @@ def debugdata(ui, repo, file_, rev=None,
         ui.write(r.revision(r.lookup(rev)))
     except KeyError:
         raise error.Abort(_('invalid revision identifier %s') % rev)
+
+@command('debugdate',
+    [('e', 'extended', None, _('try extended date formats'))],
+    _('[-e] DATE [RANGE]'),
+    norepo=True, optionalrepo=True)
+def debugdate(ui, date, range=None, **opts):
+    """parse and display a date"""
+    if opts["extended"]:
+        d = util.parsedate(date, util.extendeddateformats)
+    else:
+        d = util.parsedate(date)
+    ui.write(("internal: %s %s\n") % d)
+    ui.write(("standard: %s\n") % util.datestr(d))
+    if range:
+        m = util.matchdate(range)
+        ui.write(("match: %s\n") % m(d[0]))