Always use numbers, never use “-st”, “-nd”, “-rd” or “-th”. When referring to a specific date, abbreviate only the months Jan., Feb., Aug., Sept. Oct., Nov. and Dec. When a phrase refers to a month, day and year, set off the year with comma: The meeting will be Jan. 5, 2001, in the library. Spell out the month when using alone or with a year and do not include a comma. Example: He arrives in October; The building will open in November 2008. Always capitalize and spell out the days of the week.
- January 1972 was a cold month.
- Jan. 2 was the coldest day of the month.
- His birthday is May 8.
- Feb. 14, 1987, was the target date.
- She testified that it was Friday, Dec. 3, when the accident occurred.
When material is presented in a column or a table, use these three-letter forms without a period: Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec.