1300 hours is used primarily in which timekeeping system?

1300 hours is used primarily in which timekeeping system?

• A. 12-hour clock
• B. 24-hour clock
• C. AM/PM notation
• D. Ancillary timekeeping

Answer: (B)

1300 hours is part of the 24-hour clock. In this system the day runs from 00:00 to 23:59 and times are written as four digits (HHMM). The hour 13 corresponds to 1 PM, so 1300 hours equals 1:00 PM. This format doesn’t use AM or PM. If you were using a 12-hour clock, you’d say 1:00 PM instead of 1300 hours. AM/PM notation is how the 12-hour system labels morning or afternoon, not how the 24-hour system represents time. Ancillary timekeeping isn’t a standard method for representing time.

1300 hours is part of the 24-hour clock. In this system the day runs from 00:00 to 23:59 and times are written as four digits (HHMM). The hour 13 corresponds to 1 PM, so 1300 hours equals 1:00 PM. This format doesn’t use AM or PM. If you were using a 12-hour clock, you’d say 1:00 PM instead of 1300 hours. AM/PM notation is how the 12-hour system labels morning or afternoon, not how the 24-hour system represents time. Ancillary timekeeping isn’t a standard method for representing time.