Time Lab
🧮

Time & Date Calculator

Durations, dates & age

Add or subtract two lengths of time.

Time A

::

Time B

::

Result

2:15:00

= 8,100 seconds · 135.0 minutes

🌐Converting time zones? Open World Clock

More time tools

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Features

⏱️Add or subtract hours, minutes and seconds — see the total in seconds and minutes too.
📅Find the exact number of days between two dates, broken down into years, months, weeks and hours.
🎂Work out your exact age in years, months and days, plus your age in days and hours.
🔒Everything runs in your browser — no ads, no sign-up, nothing sent to a server.

Frequently Asked Questions

How do I add or subtract time?

Enter two times as hours, minutes and seconds, pick + or −, and the result updates live — shown as H:MM:SS plus the total in seconds and minutes.

How do I find the number of days between two dates?

Set a From and To date. The calculator shows the whole number of days between them, plus a years/months/days and weeks breakdown. Use Today to fill in the current date.

How is my age calculated?

Enter your date of birth and we compute your exact age in years, months and days as of today, along with your total days lived, your next birthday, and the weekday you were born on.

Can it convert time zones?

For converting a time across cities and time zones, use the World Clock — it shows live times side by side. This calculator focuses on durations, date differences and age.