Days Until Calculator — Free Online
Count the exact number of days until any future date or event. Shows total days, weeks, and the weekday of your target date — perfect for countdowns and planning.
How to Use the Days Until Calculator
- Select your target date — a future event, deadline, birthday, or holiday
- Click "Count Days" to instantly see the result
- The result shows total days, weeks with remaining days, and the weekday of your target date
- Past dates are also supported — the calculator shows how many days ago they occurred
- Copy the day count using the copy button
How the Days Until Calculator Works — The Formula
Days Until = JDN(Target Date) − JDN(Today)
Weeks = ⌊|Days Until| / 7⌋
Remaining Days = |Days Until| mod 7
If Days Until < 0: date is in the past
Today is excluded from the count (standard convention)
Formula validated by Vipul Jaganiya, Computer Science expert in Calendar Mathematics and Timezone Engineering.
Real-World Examples
| Target Date | Event | Days Until (from 2026-05-26) | Weekday |
|---|---|---|---|
| 2026-12-25 | Christmas Day | 213 days | Friday |
| 2027-01-01 | New Year 2027 | 220 days | Friday |
| 2026-08-15 | India Independence Day | 81 days | Saturday |
| 2026-06-21 | Summer Solstice | 26 days | Sunday |