Date Duration Calculator
Date Duration Calculator
Find the exact duration between two dates — in days, weeks, months and years. Also add or subtract days from any date to plan deadlines, events and trips.
Duration between dates
Add / subtract days
What this calculator does
- Duration mode — exact days between two dates, plus weeks, calendar months and years.
- Add/subtract mode — find the date 90 days from today, 45 days before a deadline, etc.
Common uses
- Project deadlines and notice periods.
- Pregnancy week tracking and event countdowns.
- Visa stay-duration and subscription day counts.
Frequently asked questions
Does it count the start date? Duration is the number of days between the dates (end − start).
Are leap years handled? Yes — calculations use the real calendar including leap days.
Can I use it for age in days? Yes — enter your birth date and today as the end date.