Date Duration Calculator
The Date Duration Calculator finds how much time lies between two calendar dates, useful for project plans, ages and deadlines.
Key Features
- Day, week, month, year output
- Inclusive or exclusive count
- Add or subtract intervals
- Time-of-day aware
- Local only
Use Cases
- Measure a project length
- Calculate an age
- Count days to a deadline
- Teach date math
How to Use
- Enter the start and end dates
- Choose the unit
- Read the span
Practical Tips
- Decide whether to include both endpoints
- Time zones change day boundaries
- Leap years affect month math
FAQ
- Inclusive count?
- Including both the start and end day adds one.
- Why off by one?
- Usually an inclusive versus exclusive choice.