Date & Time calculator
Anniversary Calculator
Find the next anniversary date, days remaining, anniversary number, and completed anniversary years.
FormulaNext anniversary = next yearly occurrence of the original month and day on or after the as-of date
Formula
Anniversary date method
Anniversary counts are calendar estimates. For employment, benefit, legal, or contract dates, confirm the official counting rule.
Next anniversary = next yearly occurrence of the original month and day on or after the as-of date
For an original date of 2020-07-14 and as-of date 2026-07-14, the next anniversary is the 6th anniversary on 2026-07-14.
FAQ7 common questions for this calculator.
FAQs
What does the Anniversary Calculator count?+
It finds the next yearly occurrence of the original date, the days until it, and the anniversary number.
What happens for February 29 anniversaries?+
For non-leap years, February 29 anniversaries are treated as February 28.
Can I use it for work anniversaries?+
Yes for planning, but verify official HR or contract rules when benefits or eligibility depend on the date.
How does the Anniversary Calculator calculate the result?+
For the Anniversary Calculator, it uses the Anniversary date method: Next anniversary = next yearly occurrence of the original month and day on or after the as-of date. For an original date of 2020-07-14 and as-of date 2026-07-14, the next anniversary is the 6th anniversary on 2026-07-14.
What information do I need to use the Anniversary Calculator?+
For the Anniversary Calculator, enter the relevant dates, times, timezone, or calendar settings requested by the form. Exact dates matter because month lengths, leap years, and boundary days can change the result.
How accurate is the Anniversary Calculator?+
Anniversary Calculator is accurate for the values and assumptions entered on this page. It uses the Anniversary date method. Recheck the inputs before relying on the estimate.
What should I check before using the Anniversary Calculator result?+
For the Anniversary Calculator, check the date and time fields, date format, timezone, daylight-saving changes, inclusive or exclusive endpoints, and whether weekends or holidays should count.
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Date & Time guide
How to use the Anniversary Calculator
Find the next anniversary date, days remaining, anniversary number, and completed anniversary years. The page also explains the anniversary date method and shows a practical example: For an original date of 2020-07-14 and as-of date 2026-07-14, the next anniversary is the 6th anniversary on 2026-07-14.
- 1
Enter your details
Enter the values for the anniversary calculator scenario you want to check.
- 2
Check the calculation
Review the result alongside the anniversary date method: Next anniversary = next yearly occurrence of the original month and day on or after the as-of date.
- 3
Compare scenarios
Change one or more inputs to see how they affect the anniversary Calculator result before you use the estimate.