Make date/timezone validation in changelog.add more robust. Add test.

tests/test-commit

@@ -0,0 +1,13 b''
+#!/bin/sh
+
+hg init test
+cd test
+echo foo > foo
+hg add foo
+hg commit -d '0 0' -m commit-1
+echo foo >> foo
+hg commit -d '1 4444444' -m commit-3
+hg commit -d '1	15.1' -m commit-4
+hg commit -d 'foo bar' -m commit-5
+hg commit -d ' 1 4444' -m commit-6
+hg commit -d '111111111111 0' -m commit-7

mercurial/changelog.py

@@ -32,7 +32,10 b' class changelog(revlog):'
     def add(self, manifest, list, desc, transaction, p1=None, p2=None,
                   user=None, date=None):
         if date:
-            when, offset = map(int, date.split())
+            # validate explicit (probably user-specified) date and
+            # time zone offset
+            when, offset = map(int, date.split(' '))
+            time.localtime(when)
             assert abs(offset) < 43200, 'bad time zone offset: %d' % offset
         else:
             if time.daylight: offset = time.altzone