Anniversary Calculator

About this calculator

This calculator finds the exact elapsed time between a past date and today, broken down into years and days, and also works out which day of the week that date fell on using calendar arithmetic (accounting for leap years, since every 4th year adds a day to February and century years have their own leap-year exceptions). Because it counts actual calendar days rather than a flat 365-day year, it stays accurate across any span, whether the date was last month or fifty years ago.

People planning wedding, dating, or company anniversaries use it to know exactly how many years and days a milestone represents, while genealogists, journalists, and trivia writers use it to confirm which weekday a historical event fell on for accuracy in an article or family record. Enter any past date to see the elapsed time and its weekday.