Tools
Duration CalculatorcalculatorsCalculate time durations and intervals. Add or subtract time periods and convert between different time units.
Time Addition CalculatorcalculatorsAdd multiple times together easily. Calculate total duration from multiple time intervals.
Time Difference CalculatorcalculatorsCalculate the exact time difference between two dates and times, including days, hours, minutes, and seconds.
Time Format ConvertercalculatorsConvert between different time formats and notations. Support for 12/24 hour formats, ISO 8601, and more.
Time Subtraction CalculatorcalculatorsSubtract time intervals easily. Calculate time differences between multiple durations.
Time Zone ConvertercalculatorsConvert times between different time zones easily. Find out what time it is anywhere in the world.
Work Hours CalculatorcalculatorsCalculate total work hours, breaks, and overtime. Track your working time and calculate pay periods easily.
Guides
basicsHow to Read and Use the 24-Hour ClockRead and convert 24-hour time easily. Avoid AM/PM confusion. Midnight is 00:00, noon is 12:00. Simple guide with conversion table.
durationHow to Calculate Your Exact Age in Years, Months, and DaysCalculate exact age in years, months, and days. Step-by-step guide to chronological age, handling leap year birthdays, and using a...
businessHow Billable Hours Work: A Guide for Lawyers and FreelancersHow billable hours work in 6-minute increments (0.1 hour). Conversion chart, ethics, and tracking tips for lawyers and freelancers.
businessHow Broadcasters Calculate Segment Times and SchedulesHow broadcasters calculate segment durations, schedule across time zones, and time ad breaks. Includes real examples for TV, sports, and...
basicsTime Calculation Mistakes People Make Every DayAvoid common time calculation mistakes: 0.5 hours = 30 minutes, not 50; midnight ambiguity; DST and month length errors explained.
basicsHow to Convert Seconds to Hours, Minutes, and SecondsConvert seconds to hours, minutes, and seconds with the division and remainder method. Examples for Unix time and the Year 2038 problem.
howtoHow to Calculate Cooking Times for Multiple DishesCoordinate multiple dishes so they finish together. Work backwards from serving time using a time subtraction calculator.
durationHow to Calculate the Number of Days Between Two DatesCalculate the exact number of days between two dates. Manual method, leap year rules, and when to use the Duration Calculator.