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

Pick two dates. The tool counts whole months from the earlier date, using the last day of a shorter month when needed, and then the leftover days.

It also shows total days and weeks. For a plain day count with weekdays, use the Calendar Date Calculator.

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 31 January to 1 March 1 month and 1 day?

31 January plus one month lands on the last day of February, and one day after that is 1 March.

Does the order of dates matter?

No. If the first date is later, the tool compares them in reverse and says so.

Related tools

Working Days Calculator Count weekdays with optional holidays. Available now World Clocks Compare live time in cities around the world. Available now Time Zone Converter Convert a date and time between any two IANA time zones. Available now Meeting Time Converter Show one meeting time in several cities at once. Available now