Merge with FreeBSD vary.c:1.16 and date.1:1.68 (yar):

Merge ... FreeBSD vary.c:1.16 and date.1:1.68 (yar):
Change behaviour of -v to be more intuitive, by accounting for the
fact that not all months have the same number of days.

(Note that, because this commit is the first of a series, the FreeBSD
revision number and date of the man page have not been bumped yet.)

Submitted-by: Sarunas Vancevicius <svan_at_redbrick_dot_dcu_dot_ie>