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Date Calculators and Countdowns

Quick, free tools for working with dates: deadlines, durations, countdowns and week numbers. Each one links to the matching month on the calendar so you can see the result in context.

Date Calculator

Add or subtract days, weeks, months, years or business days from any date.

Days Between Dates

Count the calendar days, weekdays and US working days between two dates.

Day Counter

Count the days since or until any date, and find day 100, 500 or 1,000.

Days Until

Count down the days until Christmas, New Year, a birthday or any date.

Week Number

Find the ISO week number for any date, with the Monday–Sunday range.

Holiday countdowns

Days until Christmas Days until New Year's Day Days until Halloween Days until Thanksgiving Days until Valentine's Day

Date Tools FAQ

Are the date tools free?

Yes. Every tool is free, needs no account and runs in your browser. Nothing you enter is sent to or stored on a server.

Which time zone do the tools use?

Anything that depends on today, such as countdowns and the current week number, uses the date on your own device. Calculations between two dates count calendar days, so time zones and daylight saving time do not change the result.

Which holidays count as non-working days?

Working and business days skip Saturdays, Sundays and the 11 US federal holidays on their observed dates. Holiday lists for other countries are on the holidays pages.

Put your dates on a calendar

Add deadlines, countdowns and events in the builder and export a printable PDF.

Open the Calendar Builder