Birth Date Age & Zodiac Checker

Check age, zodiac, and Japanese era from your birth date

Local Processing Only

Check Age, Zodiac, and Era from Birth Date

Enter your birth date and reference date to get full age, counting age, zodiac, Japanese era, and elapsed days.

Birth Date Reference Date

Results appear after entering a birth date.

Full Age

Counting Age

Zodiac (12 Animals)

Japanese Era

Birth Date (Gregorian)

Days Since Birth

Next Birthday

Summary

Enter a birth date.

How to Use

Enter your birth date and adjust the reference date if needed.

Use the today shortcut to switch the calculation baseline instantly.

Check age, counting age, zodiac, era, and elapsed-day cards.

Review next-birthday date and remaining days for planning.

FAQ

What is the difference between full age and counting age?

Full age increases on your birthday, while counting age increases every New Year. This tool shows both on the same reference date.

Is zodiac based on lunar calendar?

No. It uses Gregorian year for the sexagenary cycle in this tool.

Does it support leap-day birthdays?

Yes. Leap-day dates are validated and handled correctly in calculations.

Why include Japanese era output?

Many Japanese workflows still require both Gregorian and era expressions.

Is birth date uploaded?

No. Calculations run locally in your browser.

Does changing the reference date change the result?

Yes. Age and day-difference results depend on the reference date. When comparing, keep the reference date the same.

Why does it say “invalid date”?

Dates that don’t exist (e.g., Feb 30, or Feb 29 on a non-leap year) will fail validation. Review your input and try again.

How are era change boundary dates handled?

The era changes on the official change date. For formal documents around boundaries, do a quick manual check of the output.

References

Cabinet Secretariat: Japanese Era Information
Primary source for official era boundary operations.
e-Gov Legal Search
Government reference for legal and administrative date standards.
MDN: Date
Browser-side date handling behavior and caveats.

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