What is the next anniversary date for a wedding on December 28, 2010?

If today is before December 28 in the current year: next anniversary = December 28 of this year, and the anniversary number = current year − 2010. If today is after December 28: next anniversary = December 28 of next year, and the anniversary number = next year − 2010.

What if the next anniversary is a milestone year (25th, 50th)?

If the calculation shows the next anniversary is a milestone year (25th, 30th, 40th, 50th, 60th, 70th), begin planning 6–12 months in advance for milestone anniversaries, or 2–4 weeks for standard annual anniversaries.

Next Anniversary Date: How to Find Your Upcoming Anniversary Year

Finding the next anniversary date requires two calculations: the calendar date of the next occurrence (same month and day in the current or upcoming year), and the anniversary year number (how many years will have passed). Both depend on whether today is before or after the anniversary month/day in the current year. See the Date Calculation for the complete year-by-year breakdown.

Calculate Your Anniversary Anniversary Calculator

Finding the Next Anniversary Calendar Date

Algorithm: (1) Take the original date's month and day. (2) Create a 'this year' version: original month/day in the current year. (3) If 'this year' version is today or in the future: the next anniversary is this year's version. (4) If 'this year' version is in the past: the next anniversary is next year's version. Special case: If today IS the anniversary date, next anniversary = same date next year.

Calculating the Anniversary Year Number

Anniversary year number = next anniversary year − original year. Example: Original date = June 10, 2000. Today = April 5, 2025. 'This year' version = June 10, 2025. Since April 5 < June 10, the next anniversary is June 10, 2025. Anniversary number = 2025 − 2000 = 25th anniversary. For comparison, explore Anniversary Countdown.

Practical Use: Planning for the Next Milestone

Knowing both the next anniversary date and its year number enables milestone planning. If the next anniversary is the 25th, 30th, 40th, 50th, or other named milestone, advance planning (venue, celebration format, gifts within the material tradition) becomes relevant. The anniversary calculator's saved anniversaries feature provides this information automatically for all stored dates. Related reading: Leap Year Anniversary.

Next Anniversary Date — Technical Reference

▸Algorithm: compare today to anniversary month/day → current year or next year
▸JavaScript: setYear(), isAfter(), isBefore() from date-fns
▸Feb 29 edge case: if non-leap year, use Feb 28 or Mar 1 per couple's preference
▸Output: Next anniversary date (calendar date) + anniversary year number

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Date Calculation