UCSF School of Pharmacy

Times of Day

Use uppercase letters, no periods, a single preceding non-breaking space character, and the small tag to specify ante meridiem or post meridiem with times of day.

Noon Versus Midnight

When specifying an event occurring at 12:00 noon or 12:00 midnight, explicitly state noon or midnight to remove the ambiguity of what AM and PM mean when paired with 12:00.

You can use MID as an abbreviation for MIDNIGHT, but as with the style above, use all caps and no periods set in a small tag, preceded by a single non-breaking space character.

We use this style because it is more aesthetically pleasing on computer displays than any other style, and it conserves valuable screen space by omitting the needless periods.

Related Topics: Date and Time Format, Time Zone, Daylight Savings Time.

Go To: Usage Details or Content Style or Style Guide