Date Calculator
Find the days, weeks and months between any two dates — or add and subtract days from a date to find a future or past date.
What Does This Tool Do?
Two tools in one: calculate the exact days, weeks and months between any two dates, or add/subtract a number of days from any date to find a resulting date.
Key Features
Days Between
Exact days, weeks and months between two dates.
Add / Subtract
Find a future or past date by adding or subtracting days.
Day of Week
Shows what day of the week the result falls on.
Instant
Results immediately.
How to Use
- Select the Days Between tab to find the gap between two dates.
- Or select Add/Subtract Days to compute a future or past date.
- Enter the required dates and click Calculate.
Frequently Asked Questions
Does the calculation include both start and end dates?▾
The result shows days between the dates (exclusive of one endpoint). Add 1 if you need to include both endpoints.
How are months calculated?▾
Month count is the calendar difference (year × 12 + month offset). Days count uses exact milliseconds.
Can I calculate across year boundaries?▾
Yes — the calculator handles all date arithmetic including leap years.