Use of the Java time class

Use of Date:

1. Date of Creation

2. Date format display

3. Conversion of dates

4, two date size comparison, date of the addition and subtraction

Some knowledge:

Carve-out of 24 time zones worldwide

Greenwich Mean Time GMT

World Coordination Time (world standard Time) UTC

Summer Time saving DST

CST Time

CST can also represent the following 4 different time zones:

Central Standard Time (USA) ut-6:00

Central Standard Time (Australia) ut+9:30

China Standard Time ut+8:00

Cuba Standard Time ut-4:00

CST can also represent the standard time in four countries of the United States, Australia, China, and Cuba.

Date class

The date class can get the current time, a comparison of two date types, a date type of milliseconds, but many methods and obsolete. If you get a specific date, time, and seconds.

New Date ();         New Date ();        Date.after (datetwo);        Date.compareto (datetwo);

Calendar class

The Calendar class is an abstract class that provides a class method getinstance. From the calendar instance, you can get information about the time zone for the month and day.

The calendar week is starting from Sunday, with a constant value of 0.

The month of the calendar is starting in January with a constant value of 0.

The first day of the month of the calendar has a value of 1.

Calendar instance = calendar.getinstance ();         int i = instance.get (calendar.date);         int i1 = instance.get (calendar.hour);         int i2 = instance.get (calendar.month);        System.out.println ("i2 =" + I2 + ", I1 =" + I1 + ", i=" + i);

SimpleDateFormat class

DateTime class