Anniversary Calculator
Enter your wedding or relationship start date to calculate years together, total days, and your next milestone anniversary.
Keep as today for live countdowns or pick a future celebration date.
Time Together
Duration as of Tuesday, November 25, 2025
10 year(s), 5 month(s), 5 day(s)
3,811 total days together
Next anniversary
11 (11th)
On Saturday, June 20, 2026 • 207 day(s) away
How to Use This Calculator
Input your start date
Use the date you began your relationship, got engaged, or tied the knot. The calculator treats it as the anchor point.
Select a reference date
Keep today for real-time results or choose a future date to see how long you’ll have been together by then.
Review milestone info
Get time together in years/months/days, total days, next anniversary number, and the traditional gift label.
Formula
Years Together = Reference Year − Start Year (adjust for anniversary)
Total Days = floor((Reference − Start) ÷ 86,400,000 ms)
Next Anniversary Date = Start Date + (Years Together + 1) years
Days Until Next = ceil((Next Anniversary − Reference) ÷ 86,400,000 ms)
Example: Married 2015-06-20 → On 2025-11-09 you’re 10 years, 4 months, 20 days together. Next anniversary (11th – Steel) on 2026-06-20.
Anniversary Planning Tips
Use the countdown to schedule reservations, order gifts, and notify loved ones. Celebrate big milestones with extra flair.
- Create a shared calendar reminder 60/30/7 days before the anniversary.
- Document highlights yearly and reflect on them during the celebration.
- Blend traditional gift themes with personal hobbies for thoughtful presents.
- Set budget goals aligned with bigger milestones (10th, 25th, 50th, etc.).
Frequently Asked Questions
Can I track multiple anniversaries?
Run the calculator for each important date (engagement, wedding, first date) and save the results separately.
How are leap years handled?
All calculations rely on actual calendar days, so leap years are accounted for automatically.
What if the next anniversary already passed?
The calculator always shows the next upcoming anniversary after the reference date.
Are milestone names universal?
Names vary by region; we list common U.S./UK traditional names. Customize as needed for your cultural traditions.