Dates and Strings
Dates and times
GregorianCalendar

The GregorianCalendar class manipulates calendar information such as year, month, and day.

The GregorianCalendar class

java.util.GregorianCalendar;

Common constructors of the GregorianCalendar class

Method	Description
GregorianCalendar()	Creates a GregorianCalendar object set to the current date and time.
GregorianCalendar(year, month, day)	Creates a GregorianCalendar object set to the specified date.
GregorianCalendar(year, month, day, hour, minute)	Creates a GregorianCalendar object set to the specified date and time.
GregorianCalendar(year, month, day, hour, minute, second)	Creates a GregorianCalendar object set to the specified date and time.

A statement that gets the current date

GregorianCalendar now = new GregorianCalendar();
Statements that create dates with literals
GregorianCalendar startDate = new GregorianCalendar(2004, 0, 30);
GregorianCalendar startTime = new GregorianCalendar(2007, 8, 20, 15, 30);

A statement that creates a date with variables

GregorianCalendar birthDate = new GregorianCalendar(birthYear, birthMonth, birthDay);

Rules for coding date/time values

Year must be a 4-digit integer.
Month must be an integer from 0 to 11 with 0 being January and 11 being December.
Day must be an integer from 1 to 31.
Hour must be an integer from 0 to 23, with 0 being 12 AM (midnight) and 23 being 11 PM.
Minute and second must be integers from 0 to 59.