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References to times of the day

Updated on January 21, 2021

Follow a consistent format when you refer to times of the day in your content.

Microsoft Style prefers the 24-hour time format, but allows the 12-hour format with the use of AM and PM. For our purposes, use the 12-hour format for time, for example:

  • 9:00 AM
  • 2:00 PM
  • noon
  • midnight
Note: To avoid ambiguity, use noon and midnight instead of 12:00 AM and 12:00 PM.
To refer to a time range, use to: The coffee break will be from 3:00 PM to 3:30 PM.

For guidance about time zones, see Microsoft Style Guide.

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