Krush Tools
D-Day Calculator
Count the days until an event or since a special date. Get your D-Day, D+ days, and every relationship milestone — from your first 100 days to 1,000 days together. Free, no sign-up.
An anniversary, a birthday, an exam, a trip — or the day you started dating.
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Try KrushWhat is a D-Day calculator?
A D-Day calculator counts the exact number of days between today and any date you choose. The name comes from the military "D-Day" — the day an operation begins — and the shorthand has become part of everyday life across Asia. In Korea, Japan, and beyond, people write D-1 for "one day to go", D-Day for the day itself, and D+1 for "one day since". You'll see it on exam countdowns, concert tickets, travel plans, and — most sweetly — couples tracking how long they've been together.
How to calculate D-Day
- 1. Pick your date. An event, birthday, exam, trip, or the day a relationship began.
- 2. Read the badge. A future date shows as D-minus the days remaining. Today is D-Day. A past date shows as D-plus the days since.
- 3. Watch your milestones. Enter a start date and the tool maps every anniversary ahead, with the precise date each one lands on.
Common uses
People reach for a D-Day calculator for all kinds of moments:
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Anniversaries
Count down to your 100-day, one-year, or 1,000-day milestone.
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Birthdays
Know exactly how many days until the celebration.
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Trips
Build the excitement for a flight, a reunion, or a first date.
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Exams & deadlines
A clean countdown that keeps you on track.
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Events
Concerts, weddings, launches, move-in day.
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Dating milestones
Track every day since you met someone special.
D-Day counting in Korea and across Asia
If you've dated within the Asian community, the D-Day and D+ format probably feels like second nature. Korean couples famously celebrate 100일 (100 days), then 200일, 300일, and the big 1,000일 — always counting the first day together as Day 1. One-year and later anniversaries fall on the calendar date instead. This calculator follows exactly that convention, so the milestone dates match how you'd actually count them with your partner.
Frequently asked questions
What does D-Day mean?
D-Day is the target day you are counting toward — an event, deadline, or anniversary. The days before it count down as D-1, D-2, D-3, and so on, and the day itself is simply "D-Day". The term comes from military planning and is used every day across Korea, Japan, and much of Asia to mark exams, trips, birthdays, and dating milestones.
What does D+ mean?
D+ counts the days that have passed since a date. The day after your D-Day is D+1, a week later is D+7, and so on. Couples often use D+ to track how long they have been together — for example, D+100 is the 100th day since they started dating.
How do you calculate D-Day?
Count the number of whole days between today and your chosen date. If the date is in the future, the result is "D-minus" that many days (D-30 means 30 days to go). If it has already passed, it is "D-plus" that many days. This calculator does the counting for you and always uses your local calendar date, so the result is never off by one.
Is today counted as D-Day?
Yes. When your chosen date is today, the result is exactly "D-Day". The day before is D-1 and the day after is D+1. For relationship milestones, though, many couples in Asia count the first day itself as Day 1 — so the 100-day mark lands 99 days after the start date.
Can I use this for anniversaries?
Absolutely. Enter the day you started dating (or your wedding date) and the calculator shows every upcoming milestone — 100 days, 200 days, 300 days, one year, 500 days, and 1,000 days — with the exact date each one falls on and how many days are left.
What is a 100-day anniversary?
The 100-day anniversary (백일 in Korean) is a beloved tradition among couples in Korea and across Asia: the 100th day of a relationship, counting the first day as Day 1. It usually calls for a small celebration, a gift, or a photo. This tool marks it automatically, along with the 200-day, 300-day, and 1,000-day milestones.
Meet someone worth counting days with.
Krush is the dating app for the Asian community — a curated space where like-minded singles connect through culture, values, and real compatibility. Your next 100-day milestone starts with the right match.
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