How is the day of the week calculated?

It uses standard calendar date logic from the selected birth date, including leap years.

Can I use this for zodiac signs?

Yes. It includes Western zodiac by date range and Chinese zodiac by birth year.

Is the birthday countdown accurate?

It is accurate for date math and useful for planning, reminders, and celebration prep.

Birthday Day Calculator

Find what day you were born, your zodiac sign, Chinese zodiac, birthstone, and more.

Your Birth Date

Enter your date of birth to reveal your birthday details.

Date of Birth

Ready to reveal?

Choose your date of birth to see your weekday, zodiac details, and birthday countdown.

What your birthday can tell you

A birthday is more than a date. This calculator helps you quickly find your birth weekday, zodiac sign, Chinese zodiac, birthstone, days alive, and next birthday countdown in one place.

How it works

Date and profile calculations

weekday = dayOfWeek(dob), daysAlive = floor((today - dob)/86400000), nextBirthday = dateDiff(today, next(dob month/day))

The tool uses regular date arithmetic. Zodiac and birthstone values come from month/day and month mappings commonly used in birthday reference charts.

Frequently asked questions

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