Date Diff
Calculating Time Between Dates
Need to know how many days until your next vacation? Or the exact age in days? This tool handles leap years and variable month lengths automatically.
Common Uses
- Project Management: Calculate working days between start and deadline.
- Finance: Calculating interest accrual periods.
- Visa/Travel: Checking 90/180 day stay limits (e.g., Schengen Visa).
The Leap Year Rule
A year is a leap year if:
1. It is divisible by 4.
2. BUT NOT if it is divisible by 100.
3. UNLESS it is also divisible by 400.
Example: 2000 was a leap year. 1900 was not.