Lumara Time

Business Days Calculator

Custom work weeks and holiday lists.

  • Free
  • No signup
  • No login

Inputs

What do you want to do?
Working weekdays
Add or subtract (add mode)

Result

How this tool works

Choose a time zone, then enter a start and an end date and time. The tool converts both to exact instants and subtracts them.

The result is shown as days, hours, minutes and seconds, plus total hours, minutes and seconds.

Time-zone rules come from the IANA database in your browser. This server uses database version 2026.5. If governments changed a rule very recently, the two can briefly disagree, so confirm important meetings with participants.

Frequently asked questions

Why is the answer different from the clock difference on a clock-change day?

Real elapsed time counts every second that passed. If the clocks jumped, the clock readings differ from the elapsed time, and the tool says so.

Which zone should I use to avoid surprises?

UTC has no clock changes, so it gives the plain elapsed time.

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