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1.21 Time of day and elapsed time

Present exact time as follows:

  • 11 a.m. or 11:00 a.m.
  • p.m. or 1:00 p.m.
  • 3:30 p.m.

For elapsed time, use colons, periods and no spaces:

  • 2:30:21.65 (hours, minutes, seconds, tenths, hundredths)

See 5.12 Representation of time in ordinary prose and with SI units and 5.13 Representation of time of day for additional information.