Excellent post. Just one point which I would pick up on, is that values for the month, weekday and day of the year passed to
POSIX::mktime begin at zero. As such, the determination of
$then_time in your post should alternatively read:
my $then_time = POSIX::mktime
(
0, # Seconds
0, # Minutes
0, # Hours
$date_parts[1], # Day (of month)
$date_parts[0] - 1, # Month
$date_parts[2] - 1900 # Year
);
This behaviour is documented on the POSIX module man page.
perl -le 'print+unpack"N",pack"B32","00000000000000000000001001100100"'
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