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Day of the Week Calculator
What weekday any date falls on.
Sunday
Weekday
July 20, 1969
Date
201
Day of the year
29
Week
Runs entirely in your browser. Nothing is sent anywhere.
How it works
- 1Enter your values.
- 2See the result update instantly as you type.
- 3Change any value to compare scenarios.
About this tool
Day of the Week Calculator: What weekday any date falls on. Type your numbers and the result is calculated instantly — no button to press, nothing to install. All math runs locally in your browser, so the values you enter are never sent anywhere.
Example
| Input | |
|---|---|
| Date | 1969-07-20 |
| Result | |
| Weekday | Sunday |
| Date | July 20, 1969 |
| Day of the year | 201 |
| Week | 29 |
How do I use the Day of the Week Calculator?
Enter your values. See the result update instantly as you type. Change any value to compare scenarios.
Is the Day of the Week Calculator free?
Yes. It is completely free with no sign-up, no usage limits and no watermark.
Is my data sent to a server?
No. Everything is calculated locally in your browser. Nothing you enter is uploaded, logged or stored.
Does it work on my phone?
Yes. It works in any modern browser on Android, iPhone, iPad, Windows, Mac and Linux — no app needed.