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
Calculate business days with clear inputs, instant results, and transparent assumptions.
Open calculatorWork Hours Calculator
Calculate work hours with clear inputs, instant results, and transparent assumptions.
Open calculatorOvertime Hours Calculator
Calculate overtime hours with clear inputs, instant results, and transparent assumptions.
Open calculatorCountdown Calculator
Calculate countdown with clear inputs, instant results, and transparent assumptions.
Open calculatorTime Zone Calculator
Calculate time zone with clear inputs, instant results, and transparent assumptions.
Open calculatorDue Date Calculator
Calculate due date with clear inputs, instant results, and transparent assumptions.
Open calculatorWeek Number Calculator
Calculate week number with clear inputs, instant results, and transparent assumptions.
Open calculatorLeap Year Calculator
Calculate leap year with clear inputs, instant results, and transparent assumptions.
Open calculatorBirthday Countdown
Calculate birthday countdown with clear inputs, instant results, and transparent assumptions.
Open calculatorUnix Timestamp Converter
Calculate unix timestamp converter with clear inputs, instant results, and transparent assumptions.
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.