Date Calculator
Calculate the duration between two dates in days, weeks, and weekdays.
Calculation Results
How to Use the Date Calculator
- 1 Select the Start Date.
- 2 Select the End Date.
- 3 Click Calculate to instantly view results locally.
Practical Example
If you set the start date to June 1, 2026 and the end date to June 15, 2026:
- Calendar days between (excluding end date): 14 days
- Calendar days between (including end date): 15 days
- In weeks: 2 weeks and 0 days
- Start weekday: Monday, End weekday: Monday
Frequently Asked Questions
What is the difference between including and excluding the end date?
Excluding the end date is the standard way of counting duration (e.g., from Monday to Tuesday is 1 day). Including the end date counts both calendar dates fully, which is typical for lodging or billing stays (from Monday to Tuesday is 2 inclusive days).
Are calculations performed securely?
Yes, our date calculations are done completely on the client side using standard JavaScript. No date values or user information are transmitted to a backend, guaranteeing full data privacy.
How are leap years calculated?
Standard Gregorian leap rules are embedded in browser JavaScript date calculations. Leap years like 2024 and 2028 are correctly counted as having 366 days, with 29 days in February.
Why would my results be off by an hour or a day?
Our tool uses your browser's local timezone to calculate durations. This completely avoids UTC date conversion shifts, which are a common source of calculation errors in date tools.