Age & Date Difference Calculator
Find your exact age or the number of days between two dates, instantly. Runs entirely in your browser — nothing you enter is ever uploaded.
What can you calculate?
DateDelta answers two everyday questions: exactly how old you (or someone else) are today in years, months, and days, or exactly how far apart two dates are — in days, weeks, and weekdays. Handy for age verification, countdowns, project timelines, or just settling an argument about how long ago something happened.
How it works
Every calculation runs directly in your browser using standard calendar math — nothing is sent to a server, so it works even offline once the page has loaded. Enter a date of birth for your exact age plus a countdown to your next birthday, or two dates for the full difference breakdown.
Frequently asked questions
Is this free to use?
Yes. There's no sign-up and no limit on how many calculations you run.
Do you store the dates I enter?
No. Every calculation happens entirely client-side in your browser. See the privacy policy for details.
How is age calculated?
Age is calculated as full elapsed years, months, and days from your date of birth to today, the same way you'd count on a calendar.
What counts as a weekday?
Monday through Friday. The weekday count excludes Saturdays and Sundays between the two dates.