Index: mercurial/cmdutil.py
===================================================================
--- mercurial/cmdutil.py
+++ mercurial/cmdutil.py
@@ -2545,6 +2545,12 @@
         pureextra = extra.copy()
         extra['amend_source'] = old.hex()
 
+        if ui.configbool('rewrite','update-timestamp')==True:  
+            if opts.get('date'):
+                pass
+            else:
+                date = dateutil.makedate()
+        
         new = context.memctx(repo,
                              parents=[base.node(), old.p2().node()],
                              text=message,
@@ -2559,13 +2565,15 @@
         if ((not changes)
             and newdesc == old.description()
             and user == old.user()
-            and date == old.date()
             and pureextra == old.extra()):
             # nothing changed. continuing here would create a new node
             # anyway because of the amend_source noise.
             #
             # This not what we expect from amend.
-            return old.node()
+            if (date == old.date() or 
+                (ui.configbool('rewrite','update-timestamp')==True and 
+                not opts.get('date'))):
+                return old.node()
 
         commitphase = None
         if opts.get('secret'):
Index: mercurial/configitems.py
===================================================================
--- mercurial/configitems.py
+++ mercurial/configitems.py
@@ -961,6 +961,9 @@
 coreconfigitem('push', 'pushvars.server',
     default=False,
 )
+coreconfigitem('rewrite', 'update-timestamp',
+    default=False,
+)
 coreconfigitem('storage', 'new-repo-backend',
     default='revlogv1',
 )
Index: mercurial/help/config.txt
===================================================================
--- mercurial/help/config.txt
+++ mercurial/help/config.txt
@@ -1806,6 +1806,13 @@
 
 Alias definitions for revsets. See :hg:`help revsets` for details.
 
+``rewrite``
+-----------
+
+``update-timestamp``
+    If true updates the date and time of the changeset to current.It is only
+    applicable for hg amend in current version.
+
 ``storage``
 -----------
 
Index: tests/test-amend.t
===================================================================
--- tests/test-amend.t
+++ tests/test-amend.t
@@ -365,3 +365,46 @@
   $ hg amend
 
 #endif
+
+When updatetimestamp is False
+
+  $ hg amend --date '1997-1-1 0:1'
+  $ hg log --limit 1 
+  changeset:   1:771a1be14d80
+  tag:         tip
+  user:        test
+  date:        Wed Jan 01 00:01:00 1997 +0000
+  summary:     b
+  
+
+When update-timestamp is True and no other change than the date
+
+  $ hg amend --config rewrite.update-timestamp=True
+  nothing changed
+  [1]
+  $ hg log --limit 1
+  changeset:   1:771a1be14d80
+  tag:         tip
+  user:        test
+  date:        Wed Jan 01 00:01:00 1997 +0000
+  summary:     b
+  
+
+When update-timestamp is True and there is other change than the date
+  $ hg amend --user foobar --config rewrite.update-timestamp=True
+  $ hg log --limit 1
+  changeset:   1:4d940abebc37
+  tag:         tip
+  user:        foobar
+  date:        Fri Jan 04 13:12:38 2019 +0000
+  summary:     b
+  
+When date option is applicable and update-timestamp is True
+  $ hg amend  --date '1998-1-1 0:1' --config rewrite.update-timestamp=True
+  $ hg log --limit 1
+  changeset:   1:0bebcd7a8323
+  tag:         tip
+  user:        foobar
+  date:        Thu Jan 01 00:01:00 1998 +0000
+  summary:     b
+