Date Difference
Calculate the exact number of days, weeks, months, and years between any two dates.
Find the exact number of days, weeks, months, and years between any two dates. Essential for project timelines, rental agreements, employment duration, pregnancy tracking, and legal day-count requirements.
Calendar math is error-prone when done manually — leap years, 28/30/31-day months, and year boundaries trip up spreadsheets and mental math alike. This calculator handles all edge cases automatically.
Use it forward (today to deadline) or backward (start date to today). Results break down into multiple units so you can report in the format your contract or syllabus requires.
Free, no sign-up. Pair with our Working Days Calculator if you need business days only (excluding weekends).
Common Uses
- ✓Project and contract duration
- ✓Days until a deadline or event
- ✓Employment tenure and benefits eligibility
- ✓Rental lease day counts
- ✓Historical date span research
How to Use the Date Difference
- 1
Enter start date
Select the first (earlier) date.
- 2
Enter end date
Select the second (later) date.
- 3
View the difference
See the exact difference in days, weeks, months, and years.
💡 Tips & Tricks
- •Use this calculator to find out how long until a deadline or event.
- •Great for calculating contract durations, project timelines, or anniversaries.
- •For business planning, pair with the Working Days Calculator.
Frequently Asked Questions
How do I calculate the number of days between two dates?
Does the calculator include the start and end date?
Can I calculate business days between dates?
How are months calculated between dates?
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