Date Calculator

Calculate date differences, add or subtract time, countdown to events, find the day of the week, and calculate ages.

Start Date

End Date

Exclude weekends (business days only)

Start Date

Years

Months

Days

Weeks

Hours

Target Date

Event Name (optional)

Enter a Date

Date of Birth

Your timezone:

About Date Calculations

Business days exclude Saturdays and Sundays. Enable the checkbox to get working day counts between dates.

Years divisible by 4 are leap years, except centuries not divisible by 400. February has 29 days in leap years.

Week numbering follows ISO 8601. Week 1 contains the first Thursday of the year. Weeks start on Monday.

Age is calculated from the date of birth to today. The next birthday countdown shows how many days until your next celebration.

🚀 Explore 125+ Free Developer Tools

From CSS generators to JSON formatters — all free, no signup required.