How to write 9:45 am?

How to Write 9:45 AM Correctly

When you need to write out a morning time like 9:45, the standard format is 9:45 AM. The capital letters following the digits stand for ante meridiem, a Latin phrase meaning "before midday."

In standard English writing, it is best practice to include a colon to separate the hours from the minutes, and a space before the abbreviation. While some people use lowercase letters (am) or drop the space, using uppercase with a space—9:45 AM—is universally accepted across school assignments, formal emails, and professional documents.

Remember that the cut-off for using AM is right at noon (12:00 PM). Anything from 12:00 midnight up until 11:59 in the morning falls into the AM category, making times like 9:45 straightforward to write every single time.