Age Calculator
Counts completed calendar years, then separately calculates elapsed calendar days.
Time & date10 free tools
Time & date
Make sense of dates, durations and days in between.
All processing happens on your device.
Date Difference
Elapsed days = (end UTC midnight − start UTC midnight) ÷ 86,400,000.
Time & dateAdd / Subtract Days
Adds a signed whole number of calendar days, rolling across month and year boundaries.
Time & dateBusiness Days Calculator
Counts Monday–Friday after the start date through the end date, subtracting unique supplied weekday holidays.
Time & dateWeek Number
ISO 8601 weeks start Monday.
Time & dateDay Of Year
January 1 is day 1.
Time & dateLeap Year Checker
A year is leap if divisible by 4, except centuries unless divisible by 400.
Time & dateCountdown Creator
Subtracts the current clock time from a target interpreted in the device’s timezone, updating each second.
Time & dateDuration Calculator
Total seconds = hours × 3600 + minutes × 60 + seconds.
Time & dateTime Duration Calculator
Subtracts start clock minutes from end clock minutes; optionally wraps an earlier end into the next day.
Time & date