Date & Time Calculators
Count days, years, hours and minutes accurately, including leap years and month lengths. Useful for deadlines, eligibility cut-offs, timesheets and planning.
5 free calculators · no sign-up · results stay in your browser
- Age Calculator Popular Exact age in years, months and days, with total days, next birthday and age on any date.
- Date Calculator Add or subtract days, weeks, months or years from a date, with a business-days option.
- Days Between Dates Calculator Popular Count days between two dates, with business days, weekends, weeks and months.
- Time Calculator Add or subtract hours, minutes and seconds, or add time to a clock time past midnight.
- Hours Calculator Hours worked from start and end times, minus breaks, with decimal hours, overtime and pay.
About these calculators
Counting dates by hand is easy to get wrong. Months have 28 to 31 days, leap years add a day, and "between" can mean including or excluding the end date. These calculators handle all of that. The age calculator gives your exact age in years, months and days from your date of birth, and can check your age on a specific date, which is useful for exam and job eligibility cut-offs.
Use the days between dates calculator to count calendar days or business days, and the date calculator to add or subtract days, weeks, months or years from a date. For timesheets and payroll, the hours calculator works out hours worked between two clock times, minus breaks, and the time calculator adds and subtracts durations.
All dates use your device's local calendar, and nothing you enter leaves your browser.
Two conventions cause most date mistakes. The first is whether to count the end date: from 1 March to 10 March is 9 days if you count the gap, or 10 days if both the first and last day are included, which is how many leave and booking rules work. Our calculators let you choose. The second is adding months to a date near the end of a month: 31 January plus one month has no matching day, so it becomes 28 February (29 in a leap year), the same rule spreadsheets use.
Business-day counts skip Saturdays and Sundays but not public holidays, because holidays differ by country, state and employer, so subtract those yourself when a deadline depends on them. For payroll, the hours calculator converts a shift to decimal hours, which is what most timesheet and payroll systems expect: 7 hours 45 minutes is 7.75 hours, not 7.45.