diff --git a/kallithea/lib/vcs/backends/hg/inmemory.py b/kallithea/lib/vcs/backends/hg/inmemory.py
--- a/kallithea/lib/vcs/backends/hg/inmemory.py
+++ b/kallithea/lib/vcs/backends/hg/inmemory.py
@@ -83,7 +83,7 @@ class MercurialInMemoryChangeset(BaseInM
                 parents[i] = parent._ctx.node()
 
         if date and isinstance(date, datetime.datetime):
-            date = date.ctime()
+            date = date.strftime('%a, %d %b %Y %H:%M:%S')
 
         commit_ctx = memctx(repo=self.repository._repo,
             parents=parents,
diff --git a/kallithea/lib/vcs/backends/hg/repository.py b/kallithea/lib/vcs/backends/hg/repository.py
--- a/kallithea/lib/vcs/backends/hg/repository.py
+++ b/kallithea/lib/vcs/backends/hg/repository.py
@@ -172,7 +172,7 @@ class MercurialRepository(BaseRepository
                 changeset.short_id)
 
         if date is None:
-            date = datetime.datetime.now().ctime()
+            date = datetime.datetime.now().strftime('%a, %d %b %Y %H:%M:%S')
 
         try:
             self._repo.tag(name, changeset._ctx.node(), message, local, user,
@@ -202,7 +202,7 @@ class MercurialRepository(BaseRepository
         if message is None:
             message = "Removed tag %s" % name
         if date is None:
-            date = datetime.datetime.now().ctime()
+            date = datetime.datetime.now().strftime('%a, %d %b %Y %H:%M:%S')
         local = False
 
         try: