Use this free anniversary calculator to count the days since a special date and find your next milestone, such as 100, 200, or 1,000 days.
How to use this anniversary calculator
Enter the date of your wedding, first date, or any special event, then press Calculate Anniversary. The result shows how many days have passed and the date of your next milestone day.
Common milestone days
Many couples celebrate 100 days, 200 days, 300 days, 1 year (365 days), 500 days, and 1,000 days. Each milestone date is the start date plus that many days.
Example
If your start date is 1 January 2025, your 100-day milestone is 11 April 2025.
Frequently asked questions
Does the count include the start day?
This calculator counts full days after the start date, the standard international way.
Can I use it for work anniversaries?
Yes, it works for any start date.