Date Countdown Calculator
Choose a starting date and a target date to find the exact number of days in between.
Use today or any reference date.
The date you’re counting down to (or from).
Days remaining until Project Deadline
0
Day(s)
That’s approximately 0.00 week(s) (0 hour(s)).
How to Use This Calculator
Pick the start date
Use the day you begin tracking from (e.g., today or project kickoff).
Select the target date
Choose the event, deadline, or milestone date.
Share the countdown
Use the results to update stakeholders or set reminders.
Formula
Days Difference = Target Date − Start Date
Hours Difference = Days Difference × 24
Weeks Difference = Days Difference ÷ 7
Example: 2025-11-09 to 2025-12-31 → 52 days remaining.
Why Track Date Differences?
- Visualize project timelines or sprint lengths.
- Plan vacations, weddings, or product launches.
- Monitor compliance deadlines or contract milestones.
- Keep motivation high with a simple days-left figure.
Frequently Asked Questions
Does the calculator include both start and end days?
No—it measures the difference between dates. To include both days, add one to the final result.
How do leap years affect the count?
Leap years are accounted for automatically because actual calendar dates are used.
Can I handle past events?
Yes—if the target date is before the start, the tool shows how many days have elapsed since that date.
What about time zones?
Date-only inputs use your local time zone; for cross-timezone scenarios, convert dates before entry.