🎂 Dates

Time Lived Calculator

Discover exactly how long you have lived: years, months, days, hours and weeks since your date of birth.

Date of birth

About the calculator

Put in your date of birth and see, down to the detail, how many years, months, days and hours have gone by since then. The math runs live in your own browser, with nothing sent to any server.

How long have you been alive?

We tend to count age in years alone, but a life gathers far more than that. Starting from your date of birth, this tool works out exactly how long you have been alive: in years, in months, in days, in hours and even in weeks. The result opens up a curious perspective on the time that has gone by.

It is one of those numbers that catch you off guard. Seeing your own existence translated into thousands of days or hours gives the passage of time a different scale. It works as a curiosity, as an excuse for a birthday reflection, or just to settle the urge to know how many days of life you have racked up so far.

Your date will not end up anywhere, because the calculation is done in the browser and appears right away. All you do is enter the day you were born.

Frequently asked questions

What time of day does the hour count start from?

Midnight of the date you enter, in your device own time zone, since there is no field for the time of birth. If you were born in the evening, the hour total runs high by up to 24. The years, months and days breakdown is unaffected, because it works from calendar dates rather than elapsed hours.

Why does the next birthday line show almost a full year on my actual birthday?

The countdown targets the next occurrence of your birth day and month, and it rolls forward as soon as that date stops being ahead of the current moment. On the day itself it has already flipped to next year, showing about 365 days. Anyone born on 29 February gets 1 March in years that are not leap years.

I entered a date and nothing appeared. What went wrong?

Two cases hide the panel with no error message: an incomplete date, because the calculation only fires once day, month and year are all filled in, and a date in the future, which would mean negative elapsed time. Check the year field first, since browsers accept a partial year and quietly hold the result back.

Related Tools

🎂

Age Calculator

Calculates exact age in years, months, days and total in hours/minutes/seconds from a birth date.

🎂

Next Birthday Countdown

How many days, hours, minutes and seconds until your next birthday? Also shows which day of the week it falls on. Everything in your browser.

🎂

Days Until 18 (Legal Age)

Find out exactly how many days are left until you (or someone) turns 18 and reaches legal adulthood. Enter a birth date and see the precise countdown.

🌌

Local Sidereal Time (GMST/LST)

Calculates Greenwich Mean Sidereal Time (GMST) and Local Sidereal Time (LST) for geographic coordinates and a specific date, used in amateur astronomy.

🕙

French Decimal Time Converter

Convert a normal time (HH:MM:SS) into French revolutionary decimal time, where the day has 10 hours of 100 minutes of 100 seconds each, and back. A curiosity from the 1793 French Revolution.

🤰

Gestational Age Calculator (LMP)

Calculate gestational age in weeks and days from the last menstrual period (LMP). Track the pregnancy week by week with precision.