Numbers, Dates & Times
Use numbers for all ages: The 2-year-old child will be 3 years old next year.
Use numbers to indicate dollar amount, followed by the written designation as needed: 5 cents; $60,000; $4 million to $5 million.
Spell out numbers one through nine, and when any number begins a sentence. Use Arabic numbers for everything equal to or greater than 10. There were three students waiting in line. Eleven students were awarded the scholarship. More than 15 people attended the event.
Spell out first through ninth when they indicate sequence in time or location: first base; the First Amendment; he was first in line. Starting with 10th use figures. Use 1st, 2nd, 3rd, 4th, etc. when the sequence has been assigned in forming names, primarily used in geographic, military and political designations: 1st Ward; 7th Fleet; 1st Sgt.
Over vs. More Than
More than is preferred with numerals: There were more than 20 members involved in the student organization.
Use figures and spell out percent: 0.6 percent; 1 percent. The % symbol can be used only in tables.
Do not add 1 before phone numbers with an area code: 850.474.2658. Phone numbers should be formatted with periods.
Use figures, except for noon (12 p.m.) and midnight (12 a.m.). Use a colon to separate hours from minutes: 11 a.m.; 4:15 p.m. Do not use :00 if the time is on the hour, except for use in formal invitations: Please join us from 11:00 a.m. to 2:00 p.m., or 3:00 to 5:00 p.m.
When a month is used with a specific date, abbreviate only Jan., Feb. Aug., Sept., Oct., Nov. and Dec.: The center opened on Oct. 4, 2011. Spell out when it is used alone, or with a year alone: The center opened in October 2011. When using the day of the week in dates, spell out the day: The grand opening is on Friday, March 3. If the year is included in a specific date, a comma should be placed after the year: The center opened on Oct. 4, 2011, with tremendous support.
Use hyphens to join ranges of years within the same century and shorten the second year: 1960-80, 2012-16, 1980-2010.
Revised: August 26, 2016