Date & Time Calculator

Calculate exact calendar spans, track net work hours, compute exact age milestones, and convert time zones directly in your browser.

Date Calculator

Calculate the exact span between two calendar dates in multiple units.

Start Date

End Date

Include end date (+1 day)

Days Between Dates Calculator

Find the exact number of days between two dates with boundary controls.

Start Date

End Date

Date Inclusion Mode

Standard (Exclude start date) Include both dates (+1 day)

Age Calculator / Date of Birth

Calculate exact chronological age accounting for month lengths and leap years.

Date of Birth

Calculate Age On

Add or Subtract From a Date

Add or subtract days, weeks, months, or years with calendar month-end capping.

Starting Date

Operation

Amount

Calendar Unit

Date Calculator From Today

Find a target date relative to your local browser clock.

Direction

Quantity

Unit

Time Calculator

Add or subtract sexagesimal hours, minutes, and seconds vectors.

First Time (HH:MM:SS)

Second Time (HH:MM:SS)

Operation

Time Duration Calculator

Calculate elapsed duration between two clock times, including overnight periods.

Start Time

End Time

End time is on the next day (overnight)

Work Time Calculator

Calculate net working hours by deducting unpaid breaks from gross shifts.

Work Start

Work End

Shift spans overnight into the next day

Breaks

Time Card Calculator

Calculate daily and weekly payroll hours with automatic decimal aggregation.

Day	Start Time	End Time	Break (Mins)	Daily Total

Minutes & Seconds Converter

Convert values across hours, minutes, and seconds with fractional breakdown.

Amount

Conversion Type

Time Zone Calculator

Convert date and time between IANA time zones with automatic Daylight Saving Time support.

Date

Time

From Time Zone

To Time Zone

Quick Date & Time Questions

How many hours is 9:30 to 4:30? Open Time Duration Calculator

How do I calculate time? Open Time Calculator

How do I calculate 24 hours? Open Time Duration Calculator

How many days are between two dates? Open Days Between Dates

How do I calculate my age? Open Age Calculator

How do I calculate work hours? Open Work Time Calculator

How many hours is 150 minutes? Open Unit Converter

More Calculators

Date CalculatorCalculate date differences in days, weeks, months, and years.

Age CalculatorCalculate your exact age from your date of birth.

Days Between DatesFind exactly how many days are between two dates.

Add or Subtract DateFind a future or past date by adding or subtracting time.

Time CalculatorAdd or subtract hours, minutes, and seconds.

Time Duration CalculatorFind the exact duration between two times.

Work Time CalculatorCalculate working hours after subtracting breaks.

Time Card CalculatorCalculate daily and weekly working hours.

Minutes & Seconds ConverterConvert between hours, minutes, and seconds.

Time Zone CalculatorConvert a date and time between time zones.