🗓️ Free Date Tools

Date & Time
Calculators

12 free tools for calculating dates, ages, countdowns, time zones and more. Fast, accurate, no sign-up needed.

Explore All Tools Days Between Dates

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All Tools

12 Free Date & Time Calculators

Click any tool to get started — no account or download required.

Days Between Dates

Calculate the exact number of days between any two dates.

Days Until a Date

Find out how many days until any future date or event.

Calculate your exact age in years, months, days, hours and minutes.

Countdown Timer

Create a live countdown to any future date and time.

Time Zone Converter

Convert times between any two time zones around the world.

Working Days Calculator

Count business days between dates, excluding weekends & holidays.

Add or Subtract Days

Add or subtract any number of days from a date.

Find the ISO week number for any date.

Hours Between Times

Calculate hours and minutes between two times.

Leap Year Checker

Check if any year is a leap year.

What Day Was It

Find out what day of the week any date fell on.

Unix Timestamp Converter

Convert Unix timestamps to human-readable dates and back.

FAQ

Common Questions

Are these tools free?

Yes — all 12 tools on daycalctools.com are completely free. No account, no download, no payment required.

How accurate are the calculations?

All calculations use JavaScript's built-in Date API and account for leap years, DST, and time zones.

Do I need to create an account?

No. Just open the tool and start calculating — no sign-up or personal data required.

Do the tools work on mobile?

Yes. Every tool on daycalctools.com is fully responsive and works on phones, tablets and desktops.