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Cisco Bug: CSCun98112 - CWMS meeting time changing with DST GMT offset

Last Modified

Feb 06, 2017

Products (1)

  • Cisco Webex Meetings Server

Known Affected Releases

Description (partial)

When DST time adjustment started, a recurring instances had the time move one hour ahead (EST time).

Example:   DST time adjustment started on 03/09 and will stop on 11/02
1. A user schedules a recurrent (so far recurrence pattern hasn't been important) meeting starting before 03/09. For example: weekly occurrence starting on 03/07 12:00h EST. Time offset at this date is GMT -5. In the background, CWMS schedules this meeting for 17:00h GMT time and on the web for the user it will show 12:00h EST (GMT -5)

2. First occurrence of the meeting takes place on 03/07 at 17:00h GMT (17h - 5h = 12:00h EST). 

3. Once the meeting ends, CWMS schedules the next occurrence which falls into DST - 03/14  for 17:00h GMT (12:00h EST); the time of the meeting will still show on the web as the 12:00h EST GMT -5.

4. On 03/14, users are able to join the meeting at 12:00h EST as the meeting time was calculated as 17:00h GMT -5 = 12:00h EST.

5. However, once this instance of the meeting is ended, and since we are in DST time frame, CWMS schedules the following occurrence on 03/21, again for 17:00h GMT. However, this time, it calculates the offset as -4, which schedules the instance for 13:00h EDT. Hence, the time of the meeting moves 1h ahead. 
Calendar invites in Outlook stay at 12:00h EDT, but on the web, that time changed to 13:00h EDT as the time offset is calculated as -4 and not -5. 

It appears that CWMS schedules meetings based on the GMT time zone and not based on the time zone user profile belongs to.

CWMS 1.5 
Recurrent meetings scheduled before and extending to DST.
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