Time duration
Compare clock differences and elapsed time, including overnight shifts and daylight saving changes.
Your inputs
The editable example is illustrative. Enter your own dimensions, operating data, prices, and fees. Results update as you edit.
Calculations run in your browser. Inputs are not saved or sent to analytics.
Your result
Complete the inputs to see your result.
How it works
- Total seconds = End date + End time − Start date − Start time; Elapsed time with zone rules: UTC
- Worked example: 22:30 → 01:15 (+1 d) = 2 h 45 min = 2.75 h; America/New_York 2026-03-08 01:30 → 03:30 = 1 h UTC
- Supported input limits:
Assumptions and limitations
Civil dates use years 1–9999. Regional instant rules use the browser’s IANA database and support 1900–9999. Select earlier or later for repeated local times; nonexistent times are rejected. Clock differences and elapsed time are distinct. No national holidays, payroll law or legal deadlines are inferred.
Sources
- MDN — Intl date/time and time-zone formatting Sources reviewed: 2026-10-06
