How to subtract hours from timestamp in java

In this article, let’s explore the various methods to find the difference between the Two Time Periods in Java. For simplicity, let’s assume that the Time Period provided to us is in the format HH:MM:SS

Example

Input : 1st Time Period :- 18:00:00 2nd Time Period :- 21:00:00 Output: 3 hours 0 minutes and 0 seconds Input : 1st Time Period :- 17:00:00 2nd Time Period :- 23:22:00 Output: 6 hours 22 minutes and 0 seconds

 

Method 1 :- Using SimpleDateFormat class and Date class

SimpleDateFormat class has been added to the java.text package in the 7th JDK version.

Parse the Time Period in the format HH:MM:SS by creating a SimpleDateFormat object. SimpleDateFormat object parses the Time period and returns a Date object which can be used to calculate the time elapsed.

Below is the code for the above approach:

Time Complexity: O(1)

 

Method 2 :- Using the LocalTime and ChronoUnit class

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