K 10
svn:author
V 6
emaste
K 8
svn:date
V 27
2017-07-20T15:28:48.526821Z
K 7
svn:log
V 328
date: avoid crash on invalid time

localtime(3) returns NULL when passed an invalid time_t but date(1)
previously did not handle it. Exit with an error in that case.

PR:		220828
Reported by:	Vinícius Zavam
Reviewed by:	cem, kevans
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D11660

END