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

Enter the event's date, time and time zone, then start the countdown. It updates every second.

It runs only while this page is open and does not send notifications. When the time is reached, it stops and says so.

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

Will it alert me when the time arrives?

No. The countdown works only while the page is open.

Why use the event's time zone?

So the countdown reaches zero at the right moment for everyone, wherever they are.

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