CalcJournal

Age calculator

Find exact age in years, months, and days. You can measure against today in Asia/Karachi, or pick another date. The dates stay in your browser.

Date of birth
Calculate age as of

Days between two dates

Count whole days from one calendar date to another, plus how many of those days are weekdays and how many are weekend days.

Start date
End date

How exact age is counted

The form uses calendar dates only, not a birth clock time. It counts complete years, then leftover months, then leftover days. Total days lived is the number of midnights between the two dates. Hours are that day count times 24, rounded to a whole number because no time of day is entered.

Today, for the as of default, is the date in Asia/Karachi. That matches the rest of CalcJournal. You can still point the as of fields at a past or future civil date if you need a different checkpoint.

Questions

How is exact age calculated including leap years?

The calculator counts complete years, then leftover months, then leftover days, from the birth date to the as of date. If you were born on 29 February, a year that is not a leap year uses 28 February as the anniversary. Total days lived counts the midnights between those two dates. The weekday comes from the birth calendar date.

What does calculate age as of mean?

The as of date is the day you want to measure against, not only today. It defaults to the calendar date in Asia/Karachi when you open the page. Change it to a past date to see how old you were then, or to a future date to see how old you will be. Both dates stay in your browser.

How are days until the next birthday counted?

The tool looks for the next anniversary of the birth month and day that falls on or after the as of date. If that date is today, the result is zero days. A 29 February birthday uses 28 February in a year that is not a leap year. The count is whole calendar days, not hours and minutes.

How does the days between two dates tool work?

It subtracts the earlier calendar date from the later one. The total is whole days from the start up to, but not including, the end date, so 1 January to 2 January is one day. Weekdays are Monday through Friday in that span. Weekend days are Saturday and Sunday. Same day pairs return zero.

Does this send my birth date to a server?

No. Age math runs in your browser with ordinary JavaScript. The birth date and the as of date are not posted to CalcJournal. There is no account and no save button. That is the same privacy rule as the zodiac calculators on this site, which also keep birth data on the device.

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