Date Calculator

Find days between dates (optionally business days) and add/subtract time. All calculations run locally in your browser.

1) Days Between Dates

Start date

End date

Inclusive (count both start and end) Business days only (Mon–Fri)

2) Add / Subtract Time

Base date

Amount

Unit

Direction

Skip weekends (Mon–Fri only)

About This Date Calculator

This tool helps you quickly answer two common questions: How many days between two dates? and What date is X days/weeks/months/years from a chosen date? Calculations are performed entirely in your browser for privacy—no data is uploaded.

To avoid daylight saving time issues, date math is done at midnight UTC. “Business days” count only Monday through Friday and ignore public holidays. If you need holiday-aware counting, consider manually subtracting those dates from the result.

Tip: use the inclusive toggle when you need to include both endpoints (e.g., a rental period spanning both the start and end date).