Day of Week Checker
Find the weekday for any calendar date.
Weekday
Monday
October 26, 2026
Tool guide
About Day of Week Checker
Find the weekday for a calendar date using the browser's date handling. It is a small date utility, and the calendar system and interpretation of very old dates can matter for historical research.
How to use this tool
- 1Select a date in the date picker.
- 2Read the weekday displayed by the tool.
- 3Check the year and calendar convention if you are using a historical date.
How the tool works
The page parses the selected date and formats it with the browser's date and locale functions to show its weekday. It does not infer a date from an event or verify the date against historical records.
Worked real-world example
A selected date such as 1 January 2000 is formatted as its corresponding weekday by the browser's calendar implementation.
Common scenarios and use cases
Check a weekday for planning, a form, a date puzzle, or a basic calendar question.
Important details and limitations
Historical regions adopted the Gregorian calendar at different times, and browser dates do not model every local calendar transition. For historical work, verify the calendar system used in the place and period.
Check the output unit as well as the number. If the result will be reused in another calculation, retain full precision where possible and round only at the end. For measurements governed by a technical specification, use the standard and tolerance required by that document.
Frequently asked questions
Does it support dates before the Gregorian calendar?
It formats the entered date using the browser's date rules; historical convention may differ.
Why can a date look different by timezone?
Date fields are parsed with browser-local conventions.
Can it tell when an event happened?
No. It only reports a weekday for the date entered.