DUE.RED
TH/EN
← All tools

Working days calculator with custom weekends

Count business days between dates using your own workweek, days off and endpoint rules. Any weekly schedule is supported.

Enter your details

30 Oct 2026
30 Oct 2026
Endpoint rules
Working weekdays
One date per line, or comma-separated. Up to 400 entries.
No automatic holidays. Add all days off and substitute holidays that apply to you.

Supports CE 1900–2100 / BE 2443–2643, using modern +543 year conversion.

How it works

Count only selected weekdays that are not explicitly excluded. Duplicate days off are counted once. A holiday on a non-working weekday is not subtracted again. No substitute holiday is generated automatically.

Example

12–18 April 2027, both endpoints included, Monday–Friday workweek and only 13 April excluded: 4 working days out of 7 calendar days. This is not a complete Songkran holiday list.

Can I work Saturdays or Sundays?

Yes. Select any schedule with at least one weekday. This page only uses the workweek and days off you enter; it does not automatically apply government or bank holidays. Add your complete holiday list before relying on the result.