How to Add or Subtract Months from a Date

This code example shows how to add and remove months from a date using an instance of the Calendar class.
The method incrementMonths takes two parameters, the Calendar object and the number of months to add.
The method decrementHours takes the same parameters and decrement the Calendar object with the number of months 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.
To tell the add() method that it is the month we want to increment or decrement we use its constant variable MONTH.

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 months.

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