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How Outlook handles time zones for meeting requests
Article ID: 195900 - View products that this article applies to.
This article was previously published under Q195900
This article discusses how Microsoft Outlook schedules meeting requests over multiple time zones.
Three factors affect the scheduling of a meeting in Outlook:
Outlook time stamps the message request with the Greenwich mean time for the meeting. Outlook calculates Greenwich mean time by using the computer's clock time, plus or minus the local time zone adjustment, minus (depending upon the time of year) the daylight-saving time adjustment.
ExampleAssume someone in the central standard time zone during the summer months (when daylight-saving time is in effect), wishes to schedule a meeting at 3:00 P.M. (their local time), with a user in the Pacific time zone.
The central standard time zone (CST) has a Greenwich mean time offset of -6:00 hours and a daylight-saving time (DST) adjustment of +1:00 hour.
Outlook calculates the time for the meeting in Greenwich mean time, as follows:
When the attendee receives the meeting request, Outlook calculates the current local time by using the message's Greenwich mean time stamp, plus or minus the local time zone adjustment, plus (depending upon the time of year) the daylight-saving time adjustment. Outlook uses this time to schedule the meeting for the recipient.
Local time for the meeting: 3:00 P.M. central standard time Adjustment for CST offset: +6:00 hours Remove DST adjustment: -1:00 hour ----- Resulting Greenwich mean time: 8:00 P.M. Greenwich mean time
Continuing the Example:
The Pacific standard time zone (PST) has a Greenwich mean time offset of - 8:00 hours and a daylight-saving time (DST) adjustment of +1:00 hour.
Outlook calculates the time for the meeting in Pacific standard time, as follows:
NOTE: As soon as Outlook receives the meeting request it calculates the meeting time for the recipient and schedules it on the calendar. If any of the three factors listed earlier in this article are incorrect at that time, the meeting time will be incorrect. You cannot correct the time after the fact by correcting the factor in error; you must open the meeting request and manually correct the scheduled time.
Meeting time in GMT: 8:00 P.M. Greenwich mean time Adjustment for PST offset: -8:00 hours Add DST adjustment: +1:00 hour ----- Local time for the meeting: 1:00 P.M. Pacific standard time