Use different time zones in Calendar on Mac By default, Calendar events are displayed in your computer’s current time zone. However, you can change the time zone and set individual events to use a different time zone. If you change your Calendar’s time zone, new events use the new time zone. When you switch back to the time zone that your Mac is using, events created in the other time zone keep that time zone. Any other events return to their original dates and times. For example, you might temporarily switch to Eastern Time to schedule a Broadway play during your upcoming vacation.
When you arrive in New York, you’d switch your calendar to Eastern Time. Back at home, events you added while in New York would keep the Eastern Time zone. Other events would return to their original dates and times.
Even better in version 2.2, for those who are working with people across multiple time zones or travel frequently, is a second axis time-zone scale that you can enable. 'Time heals all wounds' and it will fix this display problem - until then, use the Work Week view or select one or more days, beginning with Monday. DST Starts or Ends on different dates. When the two time zones start and/or end Daylight Saving time on different dates, the time scale will vary during the delta period.