How do I calculate how many years we have been together?

Enter the original anniversary or relationship start date. The calculator counts the full calendar years, months, and days that have passed.

Does the anniversary calculator show the next anniversary?

Yes. It calculates the next occurrence of the anniversary date and shows how many calendar days remain.

Can I use the calculator for a wedding anniversary?

Yes. It can be used for weddings, relationships, work anniversaries, business milestones, friendships, and other yearly events.

What happens with a February 29 anniversary?

For a February 29 start date, the calculator lets you choose February 28 or March 1 as the observed anniversary during non-leap years.

Free Date & Time Tool

Anniversary Calculator

Calculate exactly how long it has been since a special date, see your next anniversary, find the number of days remaining, and track upcoming anniversary milestones.

Enter Your Dates

Add your anniversary or milestone date and choose the date you want to calculate from.

Anniversary Type

Anniversary / Start Date

Enter the original date of your wedding, relationship, work, business, or other milestone.

Calculate As Of

Your Anniversary Results

Enter your anniversary date and click Calculate Anniversary to see your exact time together and upcoming celebration.

Time Since Your Anniversary

0 years, 0 months, 0 days

Next Anniversary -

Days Remaining -

Total Days 0

Total Weeks 0

Completed Anniversaries 0

Upcoming Anniversary -

Anniversary Theme

Your upcoming anniversary theme will appear here.

Progress to next anniversary 0%

Upcoming Anniversaries

What Is an Anniversary Calculator?

An anniversary calculator measures the amount of time between an important starting date and a selected comparison date. It can calculate completed years, calendar months, remaining days, total days together, and the date of the next yearly anniversary.

You can use this tool for wedding anniversaries, relationship milestones, work anniversaries, business founding dates, friendships, or any other important date that repeats each year.

How to Use the Anniversary Calculator

Enter the Start Date

Select the original date of your wedding, relationship, job, business, or milestone.

Select an As Of Date

Use today for a current result or choose another date to plan a future anniversary.

View Your Results

See exact time elapsed, total days, next anniversary date, countdown, and milestones.

How the Anniversary Calculation Works

The calculator compares calendar dates rather than assuming that every month has the same number of days. This makes the result more useful when months have different lengths or when a leap year is involved.

Completed Years = Full yearly anniversaries reached Exact Duration = Completed Years + Completed Months + Remaining Days Total Days = As Of Date - Original Date Next Anniversary = Next occurrence of the original month and day Days Remaining = Next Anniversary Date - As Of Date

February 29 Anniversaries

If the original date is February 29, the calculator lets you choose whether a non-leap-year anniversary should be observed on February 28 or March 1.

Frequently Asked Questions

Enter the date your relationship, marriage, or other milestone began. The calculator counts the full calendar years that have passed and also shows the remaining months and days.

Yes. It finds the next occurrence of your original anniversary month and day and shows both the date and the number of calendar days remaining.

Yes. The calculator can be used for weddings, dating anniversaries, engagements, work anniversaries, business anniversaries, and other yearly milestones.

For leap-day anniversaries, you can choose whether the anniversary should fall on February 28 or March 1 when the selected year does not contain February 29.

Yes. Change the Calculate As Of field to a future date to see how long the anniversary will have lasted at that point.