What this calculator does
The Anniversary Calculator counts how many full years have passed since a special date, shows the total number of days together, and counts down to the next anniversary.
How the calculation works
The calculator compares your anniversary date to today’s date. A full year only counts once the month and day have both been reached, so if your anniversary hasn’t happened yet this year, the year count is reduced by one to stay accurate. The countdown finds the next occurrence of your anniversary date, rolling over to next year if this year’s date has already passed.
This tool is for general and celebratory use, such as planning a party or gift for a wedding, dating, or work anniversary.
Last reviewed August 2026