| Use 24-hour time formats. |
| Always use figures. |
| Follow absolute times with a timezone specification. |
| Separate days, hours, minutes and seconds with a colon and no spaces. |
| Separate seconds and fractions thereof with periods. |
| If the scope of a specification is unclear, increase the precision or specify the scope of the lowest precision. |
| Use Coordinated Universal Time (UTC) for all worldwide events. Refer to the Section A.3.1.2, “Absolute Times” section for more information about UTC. |
| Localized events may be specified using UTC or the local time, but always specify a timezone or offset. |
15:00 UTC
1:15:00:00.50 (1 day, 15 hours, 0 minutes, 0 seconds and 50/100 of one second)
15:00 minutes (15 minutes)
15:30 hours (15 hours and 30 minutes)
The global conference will take place at 15:00 UTC.
The event will be in Raleigh, NC, and will take place at 11:00 UTC-4.