Simple, calendar-accurate tools for working with dates. Everything runs in your browser.
Your exact age in years, months and days, with days lived, next birthday and zodiac sign.
Days, weeks, months and years between any two dates, plus weekday and weekend counts.
A live countdown in days, hours, minutes and seconds to the next birthday.
Which weekday a date falls on, plus day of the year, ISO week and leap year check.
ChronoAge started as a single age calculator and has grown into a small set of date tools. Each one is built on real calendar dates rather than rough estimates, so month lengths and leap years are always handled correctly.
All calculations are performed in your browser by the code on each page. The tools use your device's local date and time zone where "today" matters. They are calculation aids: for legal, financial or official deadlines, always check the counting rules of the organisation concerned.
ChronoAge is an independent project that aims to make everyday date questions quick to answer. You can read more on the About page, or get in touch through the Contact page if you have a suggestion or find a mistake.