Add, subtract, and convert time values with precision. Calculate time differences, time spans, and work with dates effortlessly.
Add and subtract time with precision
Understanding how time units relate to each other:
Different approaches to time calculations:
Special considerations in time calculations:
Real-world uses for time calculations:
Find answers to common questions about Online Calculator.
The Time Calculator helps you add, subtract, multiply, and convert time values between hours, minutes, and seconds.
Enter the time values (hours, minutes, seconds) you want to add, and the calculator will provide the total duration.
Enter two time values, and the calculator will find the difference, displaying the remaining time.
Yes, the calculator allows you to convert hours to minutes, seconds, and vice versa.
No, negative time values are not possible. If subtraction results in a negative value, the calculator will display an error or set the result to zero.
No, this calculator only performs basic time arithmetic and conversions. Time zone adjustments require a separate time zone converter.
Yes, you can enter two dates and times, and the calculator will compute the time difference in days, hours, minutes, and seconds.
The calculator works with both 12-hour (AM/PM) and 24-hour formats. Make sure to select the correct format before entering values.
Yes, you can multiply or divide time values to scale durations (e.g., doubling a time span or dividing it in half).
Yes, you can use the calculator to sum up work hours, determine overtime, or split time evenly across tasks.
To calculate hours worked, subtract the start time from the end time. For example, if you started at 9:00 AM and finished at 5:30 PM, the calculation would be 5:30 PM - 9:00 AM = 8 hours and 30 minutes. If your work spans across midnight, you'll need to handle the date change (e.g., 11:00 PM to 7:00 AM = 8 hours). Don’t forget to subtract any unpaid break periods from your total.
When calculating across time zones, it's best to first convert all times to a standard reference (like UTC) before performing calculations. For example, if you're calculating the duration of a flight from New York (UTC-5) to London (UTC+0), convert both departure and arrival times to UTC first, then find the difference. Alternatively, you can account for the time zone difference directly in your calculation by adding or subtracting the appropriate number of hours.
Date calculations can be tricky due to several factors: months have different numbers of days (28-31), leap years add an extra day to February, and daylight saving time transitions can create 23 or 25-hour days. For example, adding one month to January 31 might give March 3 (in non-leap years) because February doesn’t have 31 days. Our calculator handles these edge cases automatically, but it’s good to be aware of these complexities when interpreting results.
To convert from 12-hour (AM/PM) to 24-hour format: - For AM times, 12 AM becomes 00:00, while other AM times remain the same (e.g., 11:30 AM is 11:30). - For PM times, add 12 to the hour (except 12 PM, which remains 12:00). - Example: 1:15 PM becomes 13:15, and 11:45 PM becomes 23:45. - To convert from 24-hour to 12-hour format, hours 0-11 become AM (with 0 becoming 12 AM), while hours 12-23 become PM (subtracting 12 from hours 13-23).
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