![]() But if we use it with the + operator, then it will be subtracted from the input date/time. If we use a negative value with the - operator, then the specified number of minutes will be added to the input date/time. It’s possible to perform date arithmetic with negative values. If the minutes to be subtracted are in 60 minute increments, we can alternatively use hours: SELECT time '15:45' - interval '1 hour' We can alternatively subtract the equivalent number in seconds: SELECT time '15:45' - interval '120 seconds' We can also add a date and time value together, and subtract minutes from that: SELECT date '' + time '01:00' - interval '18 minutes' We can even subtract minutes from a date value: SELECT date '' - interval '12 minutes' We can also subtract minutes from an interval: SELECT interval '5 hours' - interval '90 minutes' Declaration Following is the declaration for (long amountToSubtract, TemporalUnit unit) method. ![]() So to subtract one or more minutes, we can use minute or minutes: SELECT time '07:00' - interval '1 minute' Īnd in plural form: SELECT time '07:00' - interval '45 minutes' Īnd here it is with a timestamp value: SELECT timestamp ' 09:00' - interval '30 minutes' The (long amountToSubtract, TemporalUnit unit) method returns a copy of this instant with the specified amount subtracted. We can specify intervals when performing arithmetic against dates and times. We can also subtract minutes from a date value or a date and time combination. The getHours () method returns a number between 0 and 23 that represents the hour for the given date according to local time. If no Date object is provided to the function, it uses the current date. In the next post we’ll look at the LocalDateTime class.In PostgreSQL, we can use the - operator to subtract one or more minutes from a time value.īy “time” value, this could be an actual time value, a timestamp, or an interval. We created a reusable function that takes the number of hours and a Date object and subtracts the hours from the date. You can use the overridden “compareTo” method in a similar manner – it will return -1, 0 or 1 depending on which side of the comparison comes first – but again the result will depend on the exact timing. If you run this code at 23:58 then the return values will be the exact opposite as 23:58 + 10 minutes = 00:08 which will be before 23:58 and 23:58 comes after 00:08. Just like above, it depends on when during the day you run this code so don’t assume that “before” will always be true and “after” will always be false in the above example. However, be careful with the return values. The isAfter and isBefore methods work as the method names imply: If you’re not sure then you can check if the ChronoUnit is supported using the isSupported method:īoolean supported = now.isSupported(ChronoUnit.CENTURIES) Only those ChronoUnit enumerations are valid that make sense for the LocalTime class: Minutes, hours, seconds, etc., anything under the level of days. There’s no “next day” in LocalTime so “until” in that case will be -1320 which is the same as -22 hrs. 23:30 in your time zone then “until” will be a negative value as 23:30 plus 2 hrs is 01:30. “until” will be 120 as there are 120 minutes from “now” until “now + 2 hrs” of course. Long until = now.until(later, ChronoUnit.MINUTES) The “until” method will find the difference between the two time points in the provided unit of measurement: ![]() You can add/subtract some units of time using the “plus” and “minus” methods. ![]() ![]() You’ll set the time to 5:32am as follows: You can also create a time using the “of” static method. This will find the current time in the default time zone of your computer. Here’s how you can find the current time of day: some of your logic depends on the time of day every day, regardless of the calendar day. LocalTime will have no concept of days, months and years. I recommend you read through the post referenced above as many methods, like the “plus” and “minus” ones still apply in the same form. minus () method of a LocalTime class used to returns a copy of this LocalTime with the specified amount of unit subtracted. The “time of day” equivalent of LocalDate is LocalTime and its usage is very similar. There’s no concept of hours and minutes in that object. A typical point in time handled through this object is e.g. In this post we saw how to handle local date values to the level of days with the LocalDate object. ![]()
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