To subtract 5 hours from 11:45 means determining the time 5 hours before 11:45. How to Subtract Hours and Minutes from Time You will get the final remainder if you want to subtract time in a.m. Step II: Add the second time, 2:10 to 3 hr and 30 min. and 2:10 p.m., we will follow the method below: After arriving at the answer, add the second time to the remainder. If needed, borrow hours and minutes to perform the subtraction. and p.m., subtract the first of the two times from 12:00. When one of the times is in a.m., and the other is in p.m., we can convert the times to 24-hour clock format and subtract.When both the times are in either a.m.To subtract time in a 12-hour clock format, we can consider the following two cases: The time in “a.m.” represents the first 12 hours of the day, and the time from 12 noon to 11:59 at night is denoted by the suffix ‘p.m.’ In a 12-hour clock format, the 24 hours of a day is divided into two parts. So, the difference between the given time is 2 hours and 40 minutes. Step III: Subtract the hours: $8$ $–$ $6 = 2$. We borrow 1 hour from 9 and add 60 to the minutes, as shown below The minutes at 9:00 are less than the minutes at 6:20. Hence, the answer is the result of Steps II and III together.įor example, calculate the difference between 6:20 and 9:00. Step III: Subtract the hours of both times. Step II: Subtract the minutes of both times. Step I: Compare the minute of both times.Ĭase 1: If the minutes of “time A” is less than the minutes of “time B,” then in “time A.”Ĭase 2: If the minutes of “time A” is more than the minutes of “time B,” jump to step 2 directly. Let us look at the method to subtract Time B from Time A or Time A - Time B: But if we use it with the + operator, then it will be subtracted from the input date/time.We can follow a simple process to subtract time in hours and minutes by hand. If we use a negative value with the - operator, then the specified number of hours will be added to the input date/time. It’s possible to perform date arithmetic with negative values. If the hours to be subtracted are in 24 hour increments, we can alternatively use days: SELECT timestamp ' 15:45' - interval '1 day' We can alternatively subtract the equivalent number in minutes: SELECT time '15:45' - interval '120 minutes' We can also add a date and time value together, and subtract hours from that: SELECT date '' + time '03:00' - interval '2 hours' We can even subtract hours from a date value: SELECT date '' - interval '8 hours' We can also subtract hours from an interval: SELECT interval '5 hours' - interval '2 hours' So to subtract one or more hours, we can use hour or hours: SELECT time '07:00' - interval '1 hour' Īnd in plural form: SELECT time '07:00' - interval '2 hours' Īnd here it is with a timestamp value: SELECT timestamp ' 09:00' - interval '30 hours' We can specify intervals when performing arithmetic against dates and times. We can also subtract hours from a date value or a date and time combination. In PostgreSQL, we can use the - operator to subtract one or more hours from a time value.īy “time” value, this could be an actual time value, a timestamp, or an interval.
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