Home What day of the week
What day of the week
2026-01-01 is a Thursday.
Read the weekday of a real date. Monday is ISO number 1.
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- ISO weekday
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- Day of year
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- Weekend
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Why this exists
A form and a calendar both ask which weekday a date falls on.
This page reads that day and does not invent a holiday list.
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01How to use it
Type the date and read the large name.
Show 2026-01-01 fills the sample.
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02What you get
The large line is the weekday.
The tiles show the ISO number, the day of the year, and the weekend answer.
Entered2026-01-01
2026-01-01 Thursday ISO 4 2024-03-01 61 2025-02-29 — -
03Worth knowing
The date page counts days between two dates.
This page answers the weekday of one date.
Questions
- QWhat is 2026-01-01?
- AThursday.
- QWhat ISO number is Monday?
- AMonday is 1 and Sunday is 7.
- QWhat about 2025-02-29?
- AThat date does not exist, so the page shows an error.
- QWhere does Copy go?
- AOnly to this browser's clipboard.
How this page works it out
This page reads the weekday of one date. 2026-01-01 is a Thursday. Monday is ISO number 1 and Sunday is 7, so Thursday is 4. 1 January is day 1 of that year.
2024-03-01 is day 61 of that leap year. 2025-02-29 does not exist, so the page shows an error. The weekend is Saturday and Sunday, or Friday and Saturday.
The date page counts the days between two dates. This page only answers the weekday. It does not invent a holiday list, and what you type stays in this browser.