What Day Was I Born?
Weekday, age in days, and birthstone
Use this when you need a fast, accurate result — no sign-up, works entirely in your browser.
Day of the week—
Age in days—
Days until next birthday—
Birthstone—
How to Use
- Enter your details into the fields above.
- Click the calculate button to get your result instantly.
- Use the clear button to start a new calculation.
Example
- Birth date 1990-05-15 → Tuesday; 13,266 days old; next birthday in 248 days; birthstone Emerald
- Birth date 2000-02-29 (leap day), reference 2026-09-08 → Born on a Tuesday; 9,688 days old at that reference; birthstone Amethyst
Formula
The weekday comes from the Gregorian calendar’s day-of-week calculation. Age in days counts whole days since birth, and days to the next birthday rolls forward to the following year if it has already passed this year. Birthstones follow the modern US list by birth month.
About What Day Was I Born?
Weekday, age in days, and birthstone. This free online tool gives you fast, accurate results without registration or downloads.
Everything runs locally in your browser, so your data is never uploaded or stored — privacy first.
Frequently Asked Questions
Is this tool free to use? +
Yes, it is completely free with no registration or download required.
Is my data private? +
Yes. Everything is processed locally in your browser. Nothing is uploaded or stored on our servers.
Does it work on mobile? +
Yes, it works on any device — phone, tablet, or desktop.