diff -r eb73f8a6177e -r a24c57f1f5c3 mercurial/debugcommands.py
--- a/mercurial/debugcommands.py	Sat Feb 24 17:49:10 2018 -0600
+++ b/mercurial/debugcommands.py	Sat Feb 24 16:16:14 2018 +0530
@@ -560,7 +560,7 @@
         d = util.parsedate(date, util.extendeddateformats)
     else:
         d = util.parsedate(date)
-    ui.write(("internal: %s %s\n") % d)
+    ui.write(("internal: %d %d\n") % d)
     ui.write(("standard: %s\n") % util.datestr(d))
     if range:
         m = util.matchdate(range)