Anniversary calculator

List milestone days and year anniversaries from a start date — the 100th day, the 1,000th, and more.

Calculated in this browser. Nothing is sent anywhere.

Calendar arithmetic in your time zone: day counts ignore clock changes, year milestones land on the same month and day. Start dates 1900–2200.

How to use

  1. Pick the start date.
  2. Run the list.
  3. See each milestone's date, weekday, and distance from today.

What it supports

Calendar-day milestones to 30,000 days and anniversaries to 100 years, in your time zone; a Feb 29 start lands on Feb 28 in common years and is flagged. Start years 1900–2200.

Related tools

Related guides