Exact age in years, months & days — plus birthday countdown, zodiac & milestones
Yes. All calculations use JavaScript's native Date object, which correctly handles leap years and varying month lengths automatically.
The date of birth must be on or before the "As Of" date. A future DOB would produce a negative age, so the calculator will display a warning instead.
It's the total elapsed milliseconds divided by 3,600,000 (ms per hour). This is an approximation from midnight to midnight — it doesn't account for your exact birth time.
No. Everything runs in your browser. Nothing is sent to a server or saved in any database.
Western zodiac uses standard Sun sign date boundaries (e.g., Aries: March 21 – April 19). The Chinese zodiac cycles through 12 animals based on the birth year.