Field guides
Short, practical articles on reading, converting and using the 24-hour clock.
Showing 13–17 of 17 articles
Time Zones ·
Zulu time is Coordinated Universal Time (UTC). What the Z means, all 25 military time zone letters, U.S. zone letters for standard and daylight time, and how to convert local time to Zulu.
Read guideBasics ·
Military time is a 24-hour clock that runs from 0000 to 2359 with no AM or PM. How it works, how to read and say it, its history, who uses it, Zulu time and practice questions.
Read guideHow-to ·
Convert military time to standard time and back with 4 simple rules, the subtract-1200 shortcut, seconds, Excel formulas, common mistakes and 10 practice problems.
Read guideDevices ·
Step-by-step settings to switch iPhone, iPad, Apple Watch, Apple TV, Android, Samsung, Windows, Mac, Chromebook, Google Calendar and Outlook to military (24-hour) time, and back.
Read guideBasics ·
Midnight is 0000 at the start of a day and 2400 at the end. When to use each, what NIST says about 12 a.m., schedules and contracts, “zero dark thirty”, and why 2430 or 2500 are never valid.
Read guide
