Quick Answer
What time is 4 hours after 1 AM?
These sentences all mean the same thing:
4 hours after 1 AM = 5 AM
1 AM + 4 hours = 5 AM
After 4 hours from 1 AM, the time is 5 AM
4h after 01:00 = 05:00
No rollover: The result stays within the same day.
Detailed Math (Step-by-Step)
Full operation shown in minutes (most reliable).
Step 1: Convert start time to minutes
| Start time | 1 AM (01:00) |
|---|---|
| Start minutes | 60 minutes after 00:00 |
| Add minutes | 4 × 60 = 240 minutes |
| Total minutes | 300 |
Step 2: Split into days + time-of-day
| Minutes per day | 1440 |
|---|---|
| Days added | 0 (because 300 ÷ 1440) |
| Remainder minutes | 300 (300 mod 1440) |
| Result time | 5 AM (05:00) |
Final: 4 hours after 1 AM is 5 AM.
Quick Lookup Table
Examples starting from 1 AM.
| Hours after | Result time | Days added |
|---|---|---|
| 0 | 1 AM | 0 |
| 1 | 2 AM | 0 |
| 2 | 3 AM | 0 |
| 3 | 4 AM | 0 |
| 4 | 5 AM | 0 |
| 5 | 6 AM | 0 |
| 6 | 7 AM | 0 |
| 7 | 8 AM | 0 |
| 8 | 9 AM | 0 |
| 9 | 10 AM | 0 |
| 10 | 11 AM | 0 |
| 12 | 1 PM | 0 |
| 24 | 1 AM | 1 |
| 36 | 1 PM | 1 |
| 47 | 12 AM | 2 |
Tip: Adding 24 hours returns to the same time-of-day, just 1 day later.
Instant Calculator
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