Date & Time Calculators
Age, date difference, work hours, and schedule calculators.
Date & Time
Age calculator, date difference, time zone, and work hours tools.
Age Calculator
Enter a birth date to see exact age in years, months, days, weeks, and total days lived. Choose any reference date — today or a future date — to calculate age at a specific milestone. Handles leap years and year-end birthdays correctly.
Date Calculator
Calculate result date and day of week from Start year, Start month, Start day, Days to add/subtract, Operation, with the key formulas and caveats needed to interpret the result correctly.
Date Difference Calculator
Enter a start date and end date to calculate the duration in days, weeks, and calendar terms. Use exclusive counting for elapsed time, or inclusive counting when both the start and end dates should count.
Day Counter
Enter two valid dates to count the exact interval between them, including total days, weeks plus days, and business days that exclude Saturdays and Sundays.
Day of the Week Calculator
Enter a valid date to see the weekday, whether it is a weekday or weekend, its position in the week, and how many days it is from today.
Hours Calculator
Calculate worked hours between two clock times, including overnight spans and break deduction, then view the same result as decimal hours.
Time Calculator
Add or subtract two durations cleanly, then inspect the same result in hours, minutes, and total seconds.
Time Card Calculator
Add daily hours for the week, separate regular and overtime time, and estimate gross pay using the overtime rule built into the calculator.
Time Duration Calculator
Enter time segments in hours, minutes, and seconds to get one total duration. The calculator handles rollover from seconds to minutes and minutes to hours, useful for work logs, media lengths, workouts, and schedules.
Time Zone Calculator
Enter a time, source UTC offset, and target UTC offset to convert fixed-offset times. For cities that observe daylight saving time, verify the date with an IANA time-zone source before scheduling.
