Time and dates without the guesswork
Convert time zones with daylight saving handled for the exact date, count days and working days, and find ISO week numbers. Everything runs in your browser.
All tools
Calendar maths done carefully: leap years, month ends and time zones included.
- Time Zone Converter
Pick a date and time in one zone and see it in many others, with daylight saving applied for that date.
Open → - World Clock
The current time in major cities, updated every second.
Open → - Days Between Dates
Count the time between two dates in days, weeks, months, years and business days.
Open → - Date Calculator
Add or subtract time from a date to find the new date.
Open → - Age Calculator
Enter a date of birth to get an exact age and the countdown to the next birthday.
Open → - Business Days Calculator
Count or add working days (Monday to Friday), with your own holidays excluded.
Open → - Week Number Calculator
Get the ISO week number, day of the year and quarter for any date.
Open →