emonster tools

Age and zodiac

Calculate your age, next birthday, and Western and Chinese zodiac from your date of birth.

Your inputs

Choose your dates and the calculation convention. Results update as you edit.

Calculations run in your browser. Inputs are not saved or sent to analytics.

Your result

Complete the inputs to see your result.

How it works

  • Completed years → Additional months → Remaining days → Remaining hours → Remaining minutes → Remaining seconds
  • Whole weeks = floor(Total days ÷ 7)
  • Chinese zodiac animal: Western signs use approximate conventional date ranges. Chinese animals use Lunar New Year, not January 1 or Spring Commences.
  • Aquarius: 01-20–02-18; Pisces: 02-19–03-20; Aries: 03-21–04-19; Taurus: 04-20–05-20; Gemini: 05-21–06-20; Cancer: 06-21–07-22; Leo: 07-23–08-22; Virgo: 08-23–09-22; Libra: 09-23–10-22; Scorpio: 10-23–11-21; Sagittarius: 11-22–12-21; Capricorn: 12-22–01-19
  • UTC is the default. Calendar age follows the birth timezone; elapsed seconds use actual instants and daylight-saving offsets. An anniversary in a clock gap shifts forward by the gap. Regional timezone rules come from your browser and can change.
  • Use UTC for dates before 1900. Regional clock history is outside this tool’s scope.

Assumptions and limitations

Civil dates use the proleptic Gregorian calendar, years 1–9999. Whole years use anniversaries, then up to 11 completed months and remaining days; month ends are clamped. A February 29 birthday in a non-leap year uses your selected February 28 or March 1 convention. Dates stay in your browser.

Sources

Date difference

Add or subtract dates

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