Anniversary Calculator
Find out how many days, weeks, months, and years have passed since an anniversary date.
Formula
Days = Today − Anniversary Date
- Weeks = days ÷ 7
- Months = days ÷ 30.44
- Years = days ÷ 365.25
Anniversary on Jan 1, 2020
Inputs
- Anniversary Year: 2020
- Anniversary Month: 1 (1-12)
- Anniversary Day: 1
From Jan 1, 2020 to today calculates the elapsed days, weeks, months, and full years.
Frequently asked questions
What is this calculator?
It tells you how long it has been since a special anniversary date.
How are months calculated?
Months are approximated as days ÷ 30.44 (average days per month).
Does it account for leap years?
Years use 365.25 days to account for leap years.
Can I use it for birthdays?
Yes — enter any past date to see how long ago it was.