Fix subtracting negative timedelta around DST #419
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tomage
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Noticed that in a very specific case, subtracting a negative timedelta yielded different results than adding the same positive timedelta.
I.e.
my_dt + timedelta(hours=10) ~= my_dt - timedelta(hours=-10).Digging into the git log, I found that a similar fix was done for the positive case here: 1ec1ad0.
It seemed logical/symmetrical to do similar with the negative case, although there may have been some good reasons for why
_add_timedelta()is different from_subtract_timedelta()that I'm missing.I also threw in one test case to test specifically subtracting a negative timedelta.
Looking forward to your feedback as always.