Relationship Anniversary Calculator
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Every couple counts differently: some celebrate monthly, some swear by the 100-day mark, some only remember the year when the reminder fires. This calculator dates the whole set - enter the day it started and the milestones re-date instantly, each one on its named weekday, because "sometime that weekend" is how every anniversary gets missed.
Bottom line: the milestones worth planning are the ones with round numbers - 100 days, 500 days, 1,000 days - plus the anniversaries themselves. The 100-day tradition (borrowed from Korean dating culture, where the first 100 days is the first real milestone) has gone fully mainstream, and 1,000 days is the collector's item: it arrives on a random Tuesday, which is exactly why planning it lands better than remembering it.
The honest part: the start date is a decision, not a fact. First date? The talk? The official ask? Couples routinely discover they have been counting from different days - the calculator's real job starts with agreeing on the anchor. Set it once, bookmark it, and the milestones never argue again.
How to use
- Set the start date - the day it became official, whatever that means for the two of you.
- Read the milestone table: every round-number day and anniversary, dated on its actual weekday.
- Bookmark the page - the start date saves on this device, so the next milestone is always one glance away.
Frequently asked questions
What are the traditional relationship milestones?
The set this calculator tracks: 100 days, six months, one year, 500 days, two years, 1,000 days, five years and ten. The day-counting milestones come from Korean dating culture (where 100 days is the first real celebration) and have gone mainstream worldwide; the year anniversaries are the Western classic. Plenty of couples track only the years - the table dates everything so the choice stays yours.
How do you calculate a 100-day anniversary?
Count forward 100 calendar days from the start date - the calculator adds the days directly, so a start on February 14 puts day 100 on May 25. No month-length puzzles, no off-by-one: the date you see is the date. Same arithmetic for 500 and 1,000 days, which is why those milestones land on weekdays nobody predicts.
Which date counts as the anniversary - first date or official?
Whichever one the two of you agree on - couples routinely discover they have been counting from different days (first date versus the official ask can be weeks apart). The calculator takes one anchor; pick the day you both remember the same way, and if the story is contested, the earlier date is the diplomatic choice.
Why do 1,000-day milestones feel special?
Because they land unpredictably: 1,000 days is 2.7 years, so the date falls on a seemingly random weekday - and a milestone that arrives on a random Tuesday only works if someone planned it. That surprise is the whole charm: the arithmetic did the romance, and the calculator exists so the arithmetic is done.