Recent calculations
Formula used
How to use this calculator
- Select the required calculation mode.
- Enter dates, times, time zones, or duration units.
- Choose calendar, rounding, business-day, and display settings.
- Press Calculate to view totals and calculation steps.
- Copy, print, share, or export the finished result.
Example calculations
| Example | Input | Expected result |
|---|---|---|
| Same-day duration | 09:15 to 17:45 | 8 hours, 30 minutes |
| Cross-midnight duration | 22:00 to next day 06:30 | 8 hours, 30 minutes |
| Add time | 2 days and 5 hours | Starting date shifted forward |
| Convert duration | 90 minutes | 1.5 hours or 5,400 seconds |
| Multiple intervals | 2h 15m plus 1h 45m | 4 hours |
Duration conversion table
| Unit | Equivalent |
|---|---|
| 1 second | 1,000 milliseconds |
| 1 minute | 60 seconds |
| 1 hour | 60 minutes |
| 1 day | 24 hours |
| 1 week | 7 days |
| 1 average month | 30.436875 days |
| 1 average year | 365.2425 days |
Calendar and business-time notes
Calendar months have different lengths. Leap years also change annual day counts. Exact timestamps remain the safest elapsed-time basis.
Business-day totals use the selected weekdays. Entered holidays are excluded from eligible dates. Break deductions reduce net working hours.
Time-zone differences may cross calendar dates. Daylight-saving transitions can shorten or lengthen elapsed days. The calculator uses browser time-zone rules.
Frequently asked questions
1. Does the calculator support seconds and milliseconds?
Yes. Time inputs support fractional seconds where browsers permit them.
2. Can the end time occur before the start?
Yes. You may keep a signed result, use an absolute result, or reject it.
3. Are months treated as equal lengths?
No. Calendar mode uses date components, while conversion mode uses a selected average.
4. Does it calculate business days?
Yes. Enable business time, select weekdays, and enter excluded holidays.
5. Can different time zones be compared?
Yes. Each elapsed-time endpoint has an independent IANA time zone.
6. Does daylight saving affect results?
Yes. Exact elapsed calculations use the browser time-zone database.
7. Can I add several work sessions?
Yes. The multiple-interval mode totals separate sessions and optional breaks.
8. What does ISO 8601 duration mean?
It is a standardized duration format using letters for date and time units.
9. Can results be rounded?
Yes. Results can be rounded, truncated, or rounded upward by unit.
10. Are recent calculations stored online?
No. Recent entries are stored locally inside the current browser.
11. Can I export results?
Yes. Use copy, CSV, PDF, print, or share-link controls.