How Many Days Have We Been Together? Count It Correctly

Quick answer: Count the calendar days between the date your relationship began and today, then choose one convention: Day 0 for completed elapsed days or Day 1 when the first date is day one. Keep that choice consistent, and track numbered milestones separately from calendar anniversaries.

Counting how many days you have been together sounds simple until two calculators give you different answers. Usually neither is broken. They are using different start dates or disagreeing about whether the first date is Day 0 or Day 1.

First, choose the date that counts

There is no universal rule for when a relationship starts. Couples commonly use one of these:

• The first date
• The day you agreed you were together
• An engagement date
• A wedding or civil-partnership date

The useful answer is the one you both recognise. Save the other important dates separately rather than trying to make one counter represent every milestone.

Day 0 or Day 1?

Suppose your relationship began on 1 January.

• With Day 0 counting, 2 January is one completed day together.
• With Day 1 counting, 1 January is the first day and 2 January is Day 2.

This creates the familiar one-day difference between calculators. Day 1 often feels more natural for a relationship counter; completed-day counting is useful when you want elapsed time. Pick one convention and keep it consistent.

Count calendar days, not 24-hour blocks

Relationship dates are calendar dates, not timestamps. Counting fixed 24-hour periods can go wrong when daylight-saving time changes make a local day 23 or 25 hours long.

A reliable day counter compares the start date and today's date as calendar days. That gives the same answer in the morning and evening and does not lose a day when the clocks change.

Total days and calendar anniversaries answer different questions

“1,000 days together” is a running total. “Two years, three months” is a calendar duration. Both can be correct at the same time, but you should not estimate one from the other by treating every year as 365 days or every month as 30 days.

Use total days for numbered milestones. Use years and months for anniversaries.

Make the number meaningful

Write down the date and counting convention you chose, especially if you are setting up a counter together. Then add separate dates for a wedding, a first date, or another occasion you want to remember. One running total is useful; expecting it to stand in for every important date is what makes it confusing.

Milestones worth saving

Many couples track 100, 200, 500 and 1,000 days together alongside monthly and yearly anniversaries. Once you have the start date and counting convention, each 100-day milestone is just the next multiple of 100.

The calculator on our Anniversary Tracker page lets you try both counting conventions immediately. Anniversary Tracker for Android keeps the counter, upcoming milestones, reminders and home-screen widgets together. It is also available for iPhone.