Numbers
Using specific guidelines for numbers and digits makes scanning for information easier.
Date and Time
Use a 12-hour time format and include the 12-hour period and timezone. The timezone should be abbreviated and in all uppercase.
For example, “The meeting is at 1:00 pm EST.”
Use a lowercase acronym after the numeric time.
For example, “The revisions were made at 10:00 am EST.”
Use a MM-DD-YYYY format for dates or write the date out in full.
For example, "The meeting is on 01-31-2020," or, “The meeting is on January 31, 2023.”
Digits
- Spell out numbers one through nine
For example: “Select two options.”
- Use numerals for numbers 10+
For example, “Select 12 files in the file listing.”
- Use a comma in numbers of four digits or more
For example, “There are over 5,000 combinations.”