The preferred format is:
- Use numerals when listing a time; 3 p.m., 3:30 p.m.
- Include a.m. and p.m. notation with periods in lowercase letters. Avoid the redundant:
6 a.m. in the morning.
- Spell out noon and midnight. Do not capitalize. Avoid the redundant: 12 noon or 12 midnight
Abbreviate these months when used with a specific date: January, February, August,
September, October, November, December unless used in a formal invitation; (Spell out March, April, May, June and July in all references) e.g.:
Sept. 10 not September 10
Oct. 31 but March 4
Spell out the month if it stands alone in running text.
When writing dates, use numerals only. Avoid the use of st, nd, rd, or th; e.g.:
The event is scheduled for Feb. 1. not The event is scheduled for Feb. 1st.
- Spell out numbers one through nine. Use numerals for numbers 10 and above.
- Use figures within a series if more than one number is more than 10; e.g.,
- 22 hours, 19 minutes, 6 seconds; 12 hats, 5 purses, and 16 pairs of shoes
- Phone numbers may be written in one of two ways:
- with the area code set off by parentheses; e.g.: (210) 829-6000
- with the use of hyphens; e.g. 210-829-6000
- Hours of the day; e.g., 7 p.m. or 7:30 p.m.
- Amounts of money with dollar sign; e.g., $3 or $3.50
- Always use numerals when referring to age; e.g., 3-year-old Annie takes ballet. or Annie, 3, takes ballet.
When using numerals with suffixes (never with dates), always place the suffix
in superscript format; e.g. 1st, 2nd, 3rd, 4th, etc.
- Do not:
- begin a sentence with numerals; instead spell out the number or rephrase sentence.
(A year is the exception)
- add a numeral in parentheses after it’s written in words; e.g., three copies, not three (3) copies