Daylight Savings Time Create Recurring Window #584

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1. Matthew Metcalf (mrm9084)

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   Matthew Metcalf (mrm9084)

   on Mar 18, 2026
2. zhiyuanliang-ms commented on Mar 19, 2026

   

   Zhiyuan Liang (zhiyuanliang-ms)

   on Mar 19, 2026

   Last edited by zhiyuanliang-ms

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   When we implement recurring timewindow filter, we discussed the problem of daylight saving time and we also checked how outlook handled it. My memory tells me that outlook has a very long region list. Different regions has different timezone and different start&end of daylight saving time. So the conclusion is that the cost to support daylight saving time is too big.
   And another reason is that at that time we expect that feature flag runs on the server, server can be deployed anywhere, so for server, time should always use UTC time. for certainty.
3. zhiyuanliang-ms commented on Mar 19, 2026

   

   Zhiyuan Liang (zhiyuanliang-ms)

   on Mar 19, 2026

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   Another low cost solution could be adding an option for the timewindow filer to indicate whether to use local time.