Date & Time
Calendar maths is deceptively hard: months vary in length, leap years interrupt the pattern, and "three months from now" is not 90 days. These tools do proper calendar arithmetic rather than dividing by 365.25, and the working-day tools iterate the actual range rather than approximating with a five-sevenths multiplier.
Collections in Date & Time
3 groups · 38 pagesDate Calculators18 calculators covering adding, subtracting and comparing dates, each with its formula and worked examples.18 calculatorsDuration Calculators10 calculators covering time arithmetic across hours, minutes and seconds, each with its formula and worked examples.10 calculatorsWorking Time Calculators10 calculators covering business days, working hours and timesheets, each with its formula and worked examples.10 calculators
All Date & Time calculators
38 focused tools.
Add Days to DateAdd Months to DateAdd Time CalculatorAge CalculatorAnnual Leave AccrualAverage Time CalculatorBillable Hours CalculatorBreak Adjusted HoursBusiness Days CalculatorCountdown Timer SplitDate Difference CalculatorDate Plus Business DaysDay of the Week CalculatorDay of the Year CalculatorDays Between Dates CalculatorDays Since a Date CalculatorDays Until a Date CalculatorDecimal Hours to TimeHalf Birthday CalculatorHours and Minutes to DecimalISO Week Number CalculatorLap Time Average CalculatorLeap Year CheckerMonths Between Dates CalculatorNext Birthday CountdownNotice Period End DateProject Deadline CalculatorShift Length CalculatorSprint Days CalculatorSubtract Days from DateSubtract Time CalculatorTime Duration CalculatorTime Zone Offset CalculatorTimesheet Total CalculatorTotal Hours CalculatorWeeks Between Dates CalculatorWorking Hours CalculatorYears Between Dates Calculator