[Tickets #13947] Calendar breaks on DST start date

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Ticket URL: https://bugs.horde.org/ticket/13947
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  Ticket             | 13947
  Created By         | jsveiga at it.eng.br
  Summary            | Calendar breaks on DST start date
  Queue              | Kronolith
  Version            | 4.2.2
  Type               | Bug
  State              | Unconfirmed
  Priority           | 2. Medium
  Milestone          |
  Patch              |
  Owners             |
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jsveiga at it.eng.br (2015-04-10 19:40) wrote:

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.




jsveiga at it.eng.br (2015-04-10 19:40) uploaded: Desktop.zip

https://bugs.horde.org/h/services/download/?app=whups&actionID=download_file&file=Desktop.zip&ticket=13947&fn=%2FDesktop.zip