Tickets :: Comment on [#13947] Calendar breaks on DST start date

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Comment	>> The problem is that >> calculations like Date.next().day() don't jump to the next day, but >> add 24 hours. I guess. > > Exactly, and it seems that adding a week adds 7*24h. Then as the DST > switch days do not have 24h, the resulting "day" is not what is > expected (as it happens when building the week rows). This is why > setting the hour for something away from 00:00 solves it as in the > patch I sent: Although it may shift +-1h, it is still within the > expected day. > > It seems that JS date arithmetic for DST is not really consistent > across browsers around 00:00 (I've found this detailing differences > even between IE9 and IE10; maybe related to the same issue: > https://msdn.microsoft.com/en-us/library/ie/jj863688%28v=vs.85%29.aspx). > > So would be interesting to make Kronilith "immune" to that, so the > results are consistent across different browsers/platforms.
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