NumberTally Military Time Converter — 12-Hour to 24-Hour
Convert standard time to military time and back instantly. Includes the full 24-hour reference chart, a batch converter for whole lists of times, and a minutes-between mini tool for shifts and schedules.
Standard → Military
Military time
14:30
Military → Standard
Standard time
2:30 PM
Your time on a 24-hour strip
Advanced options
Batch converter — one time per line
Minutes between two times
Overnight aware — an end earlier than the start counts as crossing midnight.
Full conversion chart
| 12-hour | 24-hour (military) | 12-hour | 24-hour (military) |
|---|
Compare: the cases people mix up
| Written | Means | Military |
|---|---|---|
| 12:00 AM | Midnight, start of day | 00:00 |
| 12:00 PM | Noon, middle of day | 12:00 |
| 24:00 | Ambiguous midnight — avoid | use 00:00 |
| 8:00 (no AM/PM) | Could be either — the whole reason military time exists | 08:00 or 20:00 |
How it’s calculated
- Standard → military: for PM hours (except 12 PM) add 12; for 12 AM use 00. Example: 2:30 PM → 2 + 12 = 14:30.
- Military → standard: hours above 12 subtract 12 and add PM; 00 becomes 12 AM. Example: 14:30 → 14 − 12 = 2:30 PM.
- Minutes between: (end − start) in minutes; if the end is earlier than the start, add 24 hours first.
The only tricky parts: midnight and noon
Everything about military time is mechanical except two edge cases people get wrong. Midnight (12:00 AM) is 00:00, the start of the day — and 24:00 is generally avoided because it is ambiguous about which day it belongs to. Noon (12:00 PM) stays 12:00; you do not add 12 to it. Memorize those two and the rest is simple addition.
Hospitals, aviation, the military, and emergency services use 24-hour time because it eliminates the single most dangerous ambiguity in scheduling: nobody has to guess whether “8:00” meant morning or evening. A medication given at 08:00 vs 20:00 is a very different event.
Reading military time out loud
In US military usage, times are spoken as hundreds: 14:30 is “fourteen thirty”, 08:00 is “zero eight hundred”. The trailing “Z” you sometimes see (1430Z) means Zulu time — UTC, the aviation and military global reference — not a local timezone.
Frequently Asked Questions
How do you write noon and midnight in military time?
Noon (12:00 PM) is 12:00 — you do not add 12. Midnight (12:00 AM) is 00:00. Those are the two edge cases; every other hour follows the add-12-for-PM rule.
Is 24:00 a valid military time?
Technically it can denote midnight at the end of a day, but it is ambiguous (which day?) and best avoided — use 00:00 for midnight instead.
What’s the difference between military time and the 24-hour clock?
Almost nothing — military time is the 24-hour clock with the colon often dropped (1430 instead of 14:30) and hours sometimes pronounced as hundreds. The conversion math is identical.
Why do hospitals use military time?
To remove AM/PM ambiguity from medication schedules, shift handoffs, and records. A misread “8:00” in a hospital can be a dosing error; 08:00 vs 20:00 cannot be confused.
What does the Z in 1430Z mean?
Z stands for Zulu time, which is UTC — the global reference used in aviation and military operations so everyone coordinates on one clock regardless of timezone.