It is not worth trying to force C locale (and failing) just to
format the 2822 datestring.
This code was borrowed from /usr/bin/822-date (Ian Jackson and
Klee Dienes, both in public domain), per suggestion by Eric Wong.
Signed-off-by: Junio C Hamano <junkio@cox.net>
Acked-by: Jakub Narebski <jnareb@gmail.com>