How to Add or Subtract Seconds from a Date

This code example shows how to add and remove seconds from a date using an instance of the Calendar class.
The method incrementSeconds takes two parameters, the Calendar object and the number of seconds to add.
The method decrementSeconds takes the same parameters and decrement the Calendar object with the number of seconds passed to it.
Note that the actuall call to the calendar is to the same method, add(), but when decrementing a negative value is passed.

The main method creates a Calendar object and print out the current date / time.
Then it instantiates a new Main object and call both methods with the calendar instance as parameter along with the number of seconds.

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