D-day Calculator
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Enter a base date to get the D-day count and a list of milestone anniversaries like 100 days or 1 year.
D-day calculation
Base date · 2026.08.21 (Fri)
D-DAY
1 days since
100 days after is 2026.11.29 (Sun)
Milestones
| Milestone | Date | Status |
|---|---|---|
| Day 100 | 2026.11.28 (Sat) | D-99 |
| Day 200 | 2027.03.08 (Mon) | D-199 |
| Day 300 | 2027.06.16 (Wed) | D-299 |
| Year 1 | 2027.08.21 (Sat) | D-365 |
| Day 500 | 2028.01.02 (Sun) | D-499 |
| Year 2 | 2028.08.21 (Mon) | D-731 |
| Day 1,000 | 2029.05.16 (Wed) | D-999 |
| Year 3 | 2029.08.21 (Tue) | D-1096 |
| Year 4 | 2030.08.21 (Wed) | D-1461 |
| Day 1,500 | 2030.09.28 (Sat) | D-1499 |
| Year 5 | 2031.08.21 (Thu) | D-1826 |
| Day 2,000 | 2032.02.10 (Tue) | D-1999 |
| Day 3,000 | 2034.11.06 (Mon) | D-2999 |
| Year 10 | 2036.08.21 (Thu) | D-3653 |
How to use
Pick a base date, and optionally give it a label.
The D-day count (D-N or D+N) from today appears instantly.
For a past date, you'll also see a list of milestones like 100, 200 days, or 1-year anniversaries.
자주 묻는 질문
Q1. What do D-100 and D+100 mean?
D-100 means 100 days remain until the date, while D+100 means 100 days have passed since it. Future dates like an exam day show as D-, past dates like an anniversary show as D+.
Q2. How is the milestone list calculated?
From your base date, it calculates day-based milestones (100, 200, 300, 500, 1000 days, etc.) and year-based ones (1st through 10th anniversary), then lists them in chronological order.
Q3. Can I calculate a date a certain number of days before or after the base date?
Yes. Use the "from the base date" field to enter a number of days and pick before or after, and it calculates that date instantly.
Q4. Is the date or label I enter saved anywhere?
No. All calculations happen entirely in your browser and are never sent to or stored on a server.
Q5. Can I enter both past and future dates?
Yes. You can enter an upcoming date like an exam day, or a past date like an anniversary. Entering a past date also shows the milestone list.
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