--- a/hgext/keyword.py	Thu Feb 08 23:27:24 2018 +0530
+++ b/hgext/keyword.py	Thu Feb 15 17:18:26 2018 +0100
@@ -111,6 +111,7 @@
     templatefilters,
     util,
 )
+from mercurial.utils import dateutil
 
 cmdtable = {}
 command = registrar.command(cmdtable)
@@ -156,21 +157,23 @@
 def utcdate(text):
     '''Date. Returns a UTC-date in this format: "2009/08/18 11:00:13".
     '''
-    return util.datestr((util.parsedate(text)[0], 0), '%Y/%m/%d %H:%M:%S')
+    dateformat = '%Y/%m/%d %H:%M:%S'
+    return dateutil.datestr((dateutil.parsedate(text)[0], 0), dateformat)
 # date like in svn's $Date
 @templatefilter('svnisodate')
 def svnisodate(text):
     '''Date. Returns a date in this format: "2009-08-18 13:00:13
     +0200 (Tue, 18 Aug 2009)".
     '''
-    return util.datestr(text, '%Y-%m-%d %H:%M:%S %1%2 (%a, %d %b %Y)')
+    return dateutil.datestr(text, '%Y-%m-%d %H:%M:%S %1%2 (%a, %d %b %Y)')
 # date like in svn's $Id
 @templatefilter('svnutcdate')
 def svnutcdate(text):
     '''Date. Returns a UTC-date in this format: "2009-08-18
     11:00:13Z".
     '''
-    return util.datestr((util.parsedate(text)[0], 0), '%Y-%m-%d %H:%M:%SZ')
+    dateformat = '%Y-%m-%d %H:%M:%SZ'
+    return dateutil.datestr((dateutil.parsedate(text)[0], 0), dateformat)
 
 # make keyword tools accessible
 kwtools = {'hgcmd': ''}