[PATCH 2 of 2] Allow commit date before Unix epoch, clean fix for (issue2513)

[Sean Farley]

Florent Gallaire <fgallaire at gmail.com> writes:

> # HG changeset patch
> # User Florent Gallaire <fgallaire at gmail.com>
> # Date 1459475770 -7200
> #      Fri Apr 01 03:56:10 2016 +0200
> # Node ID 7f6081a0fc762d2d17bcfb4a5ab77d1ac57a2199
> # Parent  ece34634e504271cf2a1dc696a2a0486a8b13488
> date: clean fix for Windows buggy gmtime() (issue2513)

If this fixes the negative timestamp issue on Windows, then it seems to
me it'd be cool to have dates < 1970, yes?