Anniversary Calculator
Calculate precise calendar dates for future day milestones (e.g. 100th, 500th day) and yearly anniversaries
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🔒 Everything runs 100% in your browser. Your files and input are never uploaded to any server.
Calculate relationships or event milestones. Input a base date to output key milestones including 100-day increments and annual anniversaries.
How to use
- Enter your relationship or event start date (Day 1).
- Verify the computed calendar dates and D-day offsets displayed in the list.
- Copy all anniversary timelines using the copy results action.
FAQ
- Why is the 100th day calculated as base date + 99 days?
- Because the base date itself counts as Day 1. To reach Day 100, we add exactly 99 days to the initial date.