Language & Styleguide: Dates and Time


Use cardinal numbers (14, 25, 31, etc.) not ordinals (1st, 2nd, 4th, etc.) when writing the date:

Example: January 19, 2010 (not January 19th, 2010)

          Incorrect: The party is on June 26th at 3 pm

          Correct: The party is on the 26th of June at 3 pm. or: The party is on June 26 at 3 pm



Do not use periods in am and pm and do not capitalize except for formal invitations such as Convocation programs and Presidential dinner invitations.

                Correct: 8:30 pm

                Incorrect: 9:30 PM,

  • Do not use the 24-hour clock.
  • Drop colons and “00” whenever possible.

Example: The game runs from 6 pm to 8 pm. (not 6:00 pm)