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Tip 20: Dates and Times

  • If the day of the month is not given, do not use a comma to separate the month and the year: The process began in April 2008.
  • Write time with lower-case letters and periods. Provide the digits for minutes only when necessary: 10 a.m.; 3:37 p.m.
  • Use ‘noon’ and ‘midnight’ rather than ’12 noon’ or ’12 midnight.’
  • In programs and other materials produced for meetings held outside the U.S., use 24-hour time: 0800 hours or 1537 hours.
  • Spelled-out time is not followed by a.m. or p.m. (seven o’clock in the evening).