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 the direction, a time zone, a date and a time. The result shows UTC, the local time, an ISO 8601 string and the Unix timestamp in seconds.

UTC has no daylight saving. Local times near a clock change may be skipped or repeated, and the tool flags both cases.

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

Is UTC the same as GMT?

For everyday scheduling they match. UTC is the modern standard and does not change with the seasons, while the UK's local time (Europe/London) does.

What is the Unix timestamp shown?

The number of whole seconds since 1 January 1970 00:00 UTC.

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