Healthcare
Military Time for Nurses: Charting, MAR Times and Dose Schedules
How nurses use military time on medication administration records: reading 24-hour orders, q4h, q6h and q8h schedules in military time, charting, handoffs and common errors.
By Free Military Time Calculator Team ·
Nurses use military time to chart every medication, assessment and vital sign as a single 4-digit time, so a 9 PM dose is written 2100 and can never be mistaken for 9 AM. Most hospitals record the medication administration record (MAR), nursing notes and orders on the 24-hour clock.
Why Hospitals Chart in Military Time
Hospitals use 24-hour time for 3 practical reasons:
- No AM/PM errors: 0900 and 2100 look different; “9:00” does not.
- Clear shift handoffs: a 12-hour night shift from 1900 to 0700 crosses midnight, and each note shows exactly when it was written.
- Simple intervals: dose intervals add up without switching between AM and PM.
Reading Times on the MAR
Read the first two digits as the hour and the last two as the minutes. Hours 13 to 23 are PM: subtract 12. A MAR entry of 1730 is 5:30 PM, and 0015 is 12:15 AM.
| MAR time | Standard time | Common use |
|---|---|---|
| 0600 | 6:00 AM | Early morning labs, first dose |
| 0900 | 9:00 AM | Morning medication pass |
| 1200 | 12:00 PM | Midday dose, meals |
| 1700 | 5:00 PM | Evening meal dose |
| 2100 | 9:00 PM | Bedtime medication pass |
| 0000 | 12:00 AM | Midnight dose |
Administration times differ by facility; always follow your unit’s policy.
Dose Schedules in Military Time
Interval orders spread doses evenly across 24 hours. These are typical start times; your facility sets the exact schedule.
| Order | Interval | Example times |
|---|---|---|
| q4h | Every 4 hours | 0200, 0600, 1000, 1400, 1800, 2200 |
| q6h | Every 6 hours | 0000, 0600, 1200, 1800 |
| q8h | Every 8 hours | 0600, 1400, 2200 |
| q12h | Every 12 hours | 0900, 2100 |
To find the next dose, add the interval to the last dose and subtract 24, if the result is 24 or more: a q8h dose at 2200 is next due at 2200 + 8 = 30 → 0600 the next day. The military time calculator does this math with day changes shown.
Charting Rules That Prevent Errors
5 habits keep 24-hour charting clean:
- Write 4 digits: 0800, never 800.
- Skip AM and PM: 2100, not 2100 PM.
- Use 0000 for midnight: a dose given at midnight starts the new day’s record.
- Chart the actual time: a dose scheduled for 0900 and given at 0915 is charted 0915.
- Check late doses against the window: many policies allow a set number of minutes before or after the scheduled time.
Shift Handoffs Across Midnight
A night shift from 1900 to 0700 is 12 hours. Notes written after midnight belong to the next date: an assessment at 0230 on Tuesday follows one at 2330 on Monday. Write the date with any time near midnight to avoid confusion.
Common Errors
- Reading 1200 as midnight. 1200 is noon; midnight is 0000.
- Adding 12 to 12 PM. A noon dose is 1200, not 2400.
- Subtracting times as plain numbers. 0600 to 1400 is 8 hours, but 1400 − 600 = 800 only works by luck; 0630 to 1415 is 7 hours 45 minutes, not 785.
Practice
- A patient is due for a q6h dose; the last dose was given at 1800. Next dose? — 0000 (midnight)
- What is 2130 in standard time? — 9:30 PM
- Chart 4:45 AM in military time. — 0445
Keep the military time chart printed at the nurses’ station for quick lookups.