Dates & Time
In General
-
Day of the week and month capitalized and spelled out, use figures for dates
-
Example: Thursday, November 11, 11:00 AM – 1:30 PM
-
-
Use numbers for dates without ordinal indicators (no 1st, 2nd, 14th, etc.)
-
Use en dash (–) between start and end times
-
Use either AM or PM only at the end of the time range unless crossing noon or midnight (7:00 – 9:00 PM or 11:00 AM – 1:30 PM)
-
When possible, use noon and midnight instead of 12 PM and 12 AM
-
-
Capitalize AM and PM to follow the best practice for accessibility
-
Time periods
-
Use en dash (–)
-
Do not repeat the century (1979–81)
-
-
Decades
-
1920s or ‘20s
-
-
Year notation
- Use BCE (before common era) and CE (common era) to note years in the Gregorian calendar rather than BC and AD (respectively "Before Christ" and Anno Domini, "in [the] year of [the] Lord"). The abbreviations BCE and CE always follow the year number.
Last updated March 1, 2022