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

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Comment	> We're also observing this behaviour in Firefox 45.4.0 with Brazilian > DST. For 2016 the duplicated day in the calendar is 15th of October. > > Any patch to this would be utterly appreciated! > > IMHO this should not be a low priority bug. It messes up people > calendars for an entire month, shifting days in such way that people > would easily miss an important meet or task. > >> Calendar views broken on DST start date (see attached). >> >> To reproduce: >> 1 - set the timezone (php.ini) to one that has DST starting at 00:00 >> of a known date. For example, date.timezone = "America/Sao_Paulo". >> 2 - access the year or month view of the calendar on the month that >> DTS starts (in this case, October) and look at the DST start date >> >> Interestingly, Android is plagued by almost the exact same bug: >> https://code.google.com/p/android/issues/detail?id=74754 >> >> This is caused by using datetime variables with the time unset (thus >> 00:00). There is no 00:00 on the DST start date (the clock "jumps" >> from 23:59 to 01:00), so functions using that date return bad results >> which are not handled properly. >> >
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