the mktime function in the POSIX module is your friend here.
~/$ perl -MPOSIX -E 'say POSIX::mktime(15, 28, 06, 27, 02, 206);'
4299114495
~/$ perl -E 'say scalar localtime (4299114495);'
Sat Mar 27 06:28:15 2106
The important thing to note is that the year value is
$year - 1900 (but of course you are going to read the POSIX pod now anyway in order to see how
strftime works to create ISO date strings ;) )
print "Good ",qw(night morning afternoon evening)[(localtime)[2]/6]," fellow monks."
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