Days Together Calculator (weekends, Christmases & anniversaries together)

How it works

Days together = end date − start date. Weekends, Christmas Days (25 December), New Year’s Days (1 January) and Valentine’s Days (14 February) are counted when they fall on or between the two dates. Full months count calendar months completed (a month is complete when the day of the month is reached again). The next anniversary is the next date with the same month and day as the start (28 February in non-leap years for a 29 February start). Korean-style day counts that call the first day “day 1” are one higher than “days together”.

FAQ

Why is my couple app one day ahead?

Many Korean couple apps count the first day as day 1, so they show days together + 1. This calculator shows the plain difference between the dates; add one for the “day 1” style.

Can I count a friendship or a marriage?

Yes — any start date works, for example a wedding date, the day you met a friend or the day you adopted a pet.

Checked 11 Nov 2026. Gregorian calendar arithmetic (day counts between two dates, weekday of each date). No external figures are used.