Lemme bet the rent on this one...
You were using a time between 12 midnight and 1am as your base time, and you crossed the spring daylight savings time boundary when a day had only 23 hours.
Then you'll be off a day. If this is the case, your epoch +/- 86400*7 solution will also fail, and you've only been lucky not to hit the same case.
So the problem was not Date::Calc, but in a misunderstanding that there's not always 24 hours in a day.
-- Randal L. Schwartz, Perl hacker
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