13 free tools
Date & Time calculators
Compare dates, calculate ages, durations, workdays, and countdowns. Every tool includes its formula, an example, and instant private results.
Age Calculator
Calculate exact age in years, months, and days from a birth date to a chosen date.
Open calculatorDate Difference Calculator
Count the exact number of days and approximate weeks between any two dates.
Open calculatorTime Duration Calculator
Find elapsed hours and minutes between two clock times, including overnight spans.
Open calculatorBusiness Days Calculator
Count working days between two dates excluding weekends.
Open calculatorWork Hours Calculator
Calculate paid hours from clock-in, clock-out, and break time.
Open calculatorOvertime Hours Calculator
Split regular and overtime hours from total time worked.
Open calculatorCountdown Calculator
Count down days, hours, and minutes until a target date.
Open calculatorTime Zone Calculator
Convert date and time between UTC offsets worldwide.
Open calculatorDue Date Calculator
Calculate due dates from a start date and duration in days.
Open calculatorWeek Number Calculator
Find ISO week number for any calendar date.
Open calculatorLeap Year Calculator
Check whether a year is a leap year and why.
Open calculatorBirthday Countdown
See exactly how long until the next birthday celebration.
Open calculatorUnix Timestamp Converter
Convert Unix timestamps to readable dates and back.
Open calculatorAbout our date & time calculators
CalculatorDepot tools are designed for quick estimates and learning. Inputs stay in your browser, and each page describes the equation behind its result. Check important decisions with a qualified professional when individual circumstances, regulations, or fees matter.