Calculateur de Durée Gratuit en Ligne
Calculez la durée entre deux heures en heures, minutes et secondes.
Frequently Asked Questions
How do I calculate time duration that crosses midnight?
Enter start time before midnight (e.g. 22:30) and end time after midnight (e.g. 02:15 the next day). Check the "Spans midnight" toggle and the calculator adds 24 hours to the end time before computing the difference.
How do I add multiple time durations together?
Add durations individually using the addition mode. For summing a list of time values (work log entries, workout segments), enter each duration sequentially — the running total updates after each addition.
What is decimal hours and when is it used?
Decimal hours express time as a decimal number: 1h 30m = 1.5 hours; 2h 45m = 2.75 hours. Decimal hours are used in time tracking, billing, and payroll systems where hours are multiplied by hourly rates.
How do I calculate total work hours from clock-in and clock-out times?
Enter your clock-in time as start and clock-out as end. Subtract your lunch break separately if unpaid. The calculator shows total worked hours in both HH:MM and decimal format for payroll calculation.
Can I calculate the end time from a start time and duration?
Yes. Use the "Start + Duration = End" mode: enter your start time and how long something takes (e.g. 3h 20m) to find what time it will end.
Is the Calculateur de Durée free to use?
Yes, the Calculateur de Durée on Allio Tools is completely free with no sign-up or registration required. It works directly in your browser.
How does the Calculateur de Durée work?
Calculez la durée entre deux heures en heures, minutes et secondes. No data is sent to a server — everything runs locally in your browser for maximum privacy and speed.
Do I need to install anything to use the Calculateur de Durée?
No installation needed. The Calculateur de Durée runs entirely in your web browser on any device — desktop, tablet, or mobile.
Is my data safe when using the Calculateur de Durée?
Completely safe. The Calculateur de Durée processes everything locally in your browser. No input data, results, or usage information is ever transmitted to or stored on any server.
Does the Calculateur de Durée work offline?
After the page loads for the first time, the Calculateur de Durée works without an internet connection for all client-side processing. Tools that fetch live external data (such as DNS or network lookups) require an active connection.
Does the Calculateur de Durée automatically account for daylight saving time?
Yes. The Calculateur de Durée uses your browser's built-in time zone data, which includes daylight saving time rules for all supported time zones, keeping results accurate year-round.
How does the Calculateur de Durée handle daylight saving time and leap years?
The Calculateur de Durée uses your browser's built-in Intl and Date APIs, which automatically account for daylight saving time transitions, leap years, and regional time zone rules. You do not need to make any manual adjustments for these calendar events.
Does the Calculateur de Durée work on all browsers?
Yes. The Calculateur de Durée is built with standard browser APIs and works on all modern browsers including Chrome, Firefox, Safari, and Edge — on both desktop and mobile. No plugins, extensions, or third-party software are required.
How do I save or export my results from the Calculateur de Durée?
Select and copy the result text to paste into any document or app. For image tools, a Download button saves the file directly to your device. Your browser's built-in screenshot function also captures results quickly. No account or login is required.