The Canadian Style
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- Introduction to Numerical Expressions
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5.13 Representation of time of day
In documents presented in both official languages, and in all forms of international communication, it may be desirable to use the 24-hour system for representing time of day, in accordance with International Standard ISO 3307 and the Treasury Board Federal Identity Program Manual.
The hour is represented by a two-digit number ranging from 00 up to 23 (or 24), the minute and second are represented by a two-digit number ranging from 00 up to 59, and the colon is used as a separator between hour and minute and between minute and second, as illustrated:
24-hour representation
| with seconds | without seconds |
|---|---|
| 00:15:00 | 00:15 |
| 08:00:00 | 08:00 |
| 12:00:00 | 12:00 (noon) |
| 24:00:00 | 24:00 (midnight) |
| 07:15:00 | 07:15 |
| 11:37:00 | 11:37 |
| 14:12:26 | 14:12 |
Note
The instant of midnight should be represented (when seconds are included) as either 24:00:00, the end of one day, or 00:00:00, the beginning of the next day, according to circumstances.
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