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time duration calculator works out how long there is between two times of day. Enter times in 24-hour HH:MM or with AM/PM (e.g. 5:30 pm). If the end time is earlier than the start time, it assumes the period runs past midnight into the next day. The result is shown in hours and minutes, as decimal hours, and as a total number of minutes and seconds. It mixes formats freely, so you can type one time in 24-hour and the other with AM/PM so an overnight span reads as a positive length.The tool converts each time to minutes past midnight, subtracts the start from the end, and — if that comes out negative — adds 24 hours, and as raw minutes and seconds for finer work.The tool correctly returns 8 hours 30 minutes.For example, from 9:00 am to 5:30 pmThe tool converts each time to minutes past midnight, subtracts the start from the end, and — if that comes out negative — returns 8 hours 30 minutes, or 510 minutes.For example, from 9:00 am to 5:30 pmThe tool converts each time to minutes past midnight, subtracts the start from the end, and — if that comes out negative — returns 8 hours 30 minutes, or 8.5 decimal hours, or 510 minutes.For example, from 9:00 am to 5:30 pmThe tool converts each time to minutes past midnight, subtracts the start from the end, and — if that comes out negative — returns 8 hours 30 minutes, or 8.5 decimal hours, or 510 minutes.For example, from 9:00 am to 5:30 pmThe tool converts each time to minutes past midnight, subtracts the start from the end, and — if that comes out negative — returns 8 hours 30 minutes, or 8.5 decimal hours, or 510 minutes.For example, from 9:00 am to 5:30 pmThe tool converts each time to minutes past midnight, subtracts the start from the end, and