Make sense of every date.
From birthdays to deadlines, get the exact answer in seconds. Beautifully simple date calculators, always free — no sign-up, no fuss.
Days between dates
Your quick calendar calculatorEvery date question, answered.
Ten handy calculators built for life's everyday moments.
Days Between Dates Calculator
Find the exact number of days, full weeks, and remaining days between any two dates.
Open calculator →Exact Age Calculator
Find your age in years, months, days, and total days — instantly and privately.
Open calculator →Add or Subtract Days From a Date
Add or subtract years, months, weeks and days to find a future or past date.
Open calculator →Business Days Calculator
Count Monday-to-Friday days between dates without confusing weekends or public holidays.
Open calculator →Birthday Countdown Calculator
See how many days until your next birthday and which weekday it falls on.
Open calculator →Date Countdown Timer
Live countdown to an upcoming date and time in your local timezone.
Open calculator →ISO Week Number Calculator
Find the ISO week number, week-year and Monday-to-Sunday date range.
Open calculator →Leap Year Calculator
Check whether any year is a leap year using the Gregorian calendar rules.
Open calculator →Day of the Week Calculator
Discover which weekday any date falls on, including dates from the past.
Open calculator →Time Duration Calculator
Calculate elapsed hours and minutes between two clock times, including overnight.
Open calculator →More answers. Less searching.
There's no reason to open a spreadsheet for a simple date question. DateRuler gives you clear results without accounts, confusing settings or unnecessary distractions.
Simple tools, clear assumptions.
Are these date calculators really free?
Yes. All ten tools are free to use, with no subscription or registration required.
Will my dates be uploaded to a server?
No. Regular calculations run in your browser. A shareable link encodes the selected dates in its URL fragment, which is not sent to the server as part of a normal HTTP request.
Can I use DateRuler in any country?
Yes. Calendar calculations work worldwide. Country-specific holidays are intentionally not included in the weekday counter.
How are month ends and leap years handled?
DateRuler uses the Gregorian calendar, handles leap years, and uses a month-end clamp when adding calendar months.