Without an account: calculations run in this browser and nothing is stored on the server. The daily challenge needs an account.
YOUR TOOLBOX
Duration
Clear calculations. Visible units. References at hand.
Shift duration
Converts a duration between HH:MM and decimal hours. 1:30 equals 1.5 h.
Result
—
Decimal hours = hours + minutes / 60. HH:MM is rounded to the nearest minute.
DATE, TIME AND ZONE
UTC and base time
Enter the instant in UTC and see the date and time at the base. The conversion applies that date's daylight-saving change.
Enter the UTC start and press «Convert date and time».
If the shift crosses midnight, enter the next day's date as the end. Elapsed time is computed between UTC instants, not by subtracting local clock times. It does not deduct breaks or decide billable hours or duty limits.