Date Calculator
8 powerful date tools in one — differences, countdowns, business days, and more
Date Difference Calculator
Find the exact time between any two dates
Add or Subtract from a Date
Add or subtract days, weeks, months, or years from any date
Business Days Calculator
Count working days between dates (excludes weekends)
Countdown Timer
Live countdown to any future date and time
Day of Week Finder
Find what day of the week any date falls on
Week Number Calculator
Find the ISO week number for any date
Leap Year Checker
Check if any year is a leap year and find nearby leap years
Zodiac Sign Finder
Find the zodiac sign for any date of birth
Frequently Asked Questions
How do I calculate days between two dates?
Use the "Difference" tab. Enter your start and end dates, then click Calculate. You'll get the exact difference in years, months, weeks, days, hours, minutes, and seconds.
How do I add days to a date?
Use the "Add/Subtract" tab. Enter your start date, choose "Add", enter the number of days (or weeks, months, years), and click Calculate to get the result date.
How are business days calculated?
Business days exclude weekends (Saturday and Sunday by default). You can customise which days to exclude. Public holidays are not automatically excluded — subtract them manually.
What is a leap year?
A leap year has 366 days (February has 29 days). A year is a leap year if: divisible by 4, except century years which must be divisible by 400. So 2000 was a leap year, but 1900 was not.
What is an ISO week number?
ISO 8601 defines week 1 as the week containing the first Thursday of the year. Weeks start on Monday. A year has either 52 or 53 weeks.
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