What is the Calendar class?

The Calendar class is abstract and provides methods to convert the time in milliseconds to the calendar fields such as seconds, minutes, hours, days, weeks, months, and years. It makes the manipulation of dates easy.

The Calendar class does not provide any public constructor. It is instantiated using the Calendar.getInstance() method as follows:

Calendar c = Calendar.getInstance();

The important methods of the Calendar class are as follows:

• c.add(f1, val): This method adds the value val to the field f1. The field f1 can be a year, a month, a week, an hour, etc.
• c.roll(f1, val): This method is similar to the add method, with the exception that when a part of the date is changed as a result of addition, its larger part does not change. This means that adding even more than twenty-four hours to the hour field will not change the day field.

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