Date Calculators
Date calculators work out the time between dates, add or subtract days, weeks and months, find an exact age, and total hours worked. Every tool runs in your browser, shows the steps behind the answer, and needs no sign-up. Start with the age calculator, count the days between two dates, or find the date that falls a set number of days away. Work-time tools cover time cards, clock in and out, working days between dates and overtime pay.
Last updated October 20, 2026
Featured tools
Date & Time · Age & Birthdays
Age CalculatorExact age in years, months and days from a date of birth
Date & Time · Counters & Countdowns
Day CounterCount the days between two dates, with weeks and business days
Date & Time · Date Math
Date Difference CalculatorThe difference between two dates in years, months, weeks and days
Date & Time · Work Hours & Time
Time Card CalculatorAdd up the hours on a weekly time card, with breaks and optional pay
All Date & Time calculators
Date Math
Add, subtract and compare dates
Date & Time · Date Math
Date Difference CalculatorThe difference between two dates in years, months, weeks and days
Date & Time · Date Math
Weeks Between DatesWeeks and leftover days between two dates
Date & Time · Date Math
Date CalculatorAdd or subtract days, weeks, months or years from a date
Date & Time · Date Math
Days Between DatesHow many days between two dates, with an include-end-date option and business days
Date & Time · Date Math
Business Days CalculatorCount business days between two dates or add and subtract them, skipping weekends and your holidays
Date & Time · Date Math
Date To Date CalculatorThe span between two dates in days, weeks, months and years, with an include-last-day option
Age & Birthdays
Exact age and birthdays
Counters & Countdowns
Days until and days since a date
Work Hours & Time
Time cards, overtime and hours worked
Date & Time · Work Hours & Time
Time Card CalculatorAdd up the hours on a weekly time card, with breaks and optional pay
Date & Time · Work Hours & Time
Time Clock CalculatorHours worked between clock in and clock out
Date & Time · Work Hours & Time
Work Hours CalculatorWorking days and work hours between two dates
Date & Time · Work Hours & Time
Overtime CalculatorOvertime hours and overtime pay from hours worked and hourly rate
Date & Time · Work Hours & Time
Hours CalculatorHours and minutes between two dates and times, minus a break
Date & Time · Work Hours & Time
Add Time CalculatorAdd or subtract hours, minutes and seconds, and apply the total to a clock time
Date & Time · Work Hours & Time
Military Time ConverterConvert 12-hour time to military time and back.
Date & Time · Work Hours & Time
Time Duration CalculatorExact days, hours and minutes between two dates and times
Date & Time · Work Hours & Time
Time CalculatorAdd and subtract hh:mm:ss times, with the total in decimal hours
Date & Time · Work Hours & Time
Timesheet CalculatorWeekly time in and out with breaks, regular and overtime hours, and gross pay
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Frequently asked questions
Which calculator finds the number of days between two dates?
Use the Day Counter for a quick count, or the Date Difference Calculator when you also want the gap in years, months and days.
How do I add days to a date?
Use the Date Calculator: enter a start date, choose Add or Subtract, and set the years, months, weeks and days to shift by.
How are hours worked calculated?
The time card and time clock calculators subtract unpaid breaks from the shift time, and the work hours calculator counts Monday-to-Friday days between two dates.
Do these calculators store my dates?
No. Every calculation runs in your browser and nothing you enter is saved or uploaded.