Date and Time

Dates, times, phone numbers, and addresses often appear together, so we’ve put guidelines for these in one place.

Spell out dates in body copy, using the full construction: March 31, 1989. In general, spell out days of the week and months also in body copy.

Write out times, using a.m. and p.m. with periods: 9:00 a.m.
1. Spell out noon and midnight. Don’t use 12:00 p.m. or 12:00 a.m.
2. Include the minutes, even when on the hour.
3. When referencing office hours, always use the time zone ET, even if the office is in another location (no parentheses, periods, or daylight/standard).