Java DateFormat setTimeZone()方法及示例

DateFormat类中 的 setTimeZone() 方法用于设置该DateFormat的日历时区。

语法

public void setTimeZone(TimeZone time_zone)

**参数 **：该方法需要一个时区类型的参数time_zone，指的是新的时区。

返回值 ：该方法不返回任何值。

下面的程序说明了DateFormat类的setTimeZone()方法的工作原理：
例1 :

// Java code to illustrate// getTimeZone() method  import java.text.*;import java.util.*;  public class DateFormat_Demo {    public static void main(String[] argv)    {        // Initializing the first formatter        DateFormat DFormat            = DateFormat.getDateInstance();          // Converting the dateformat to string        String str = DFormat.format(new Date());          // Original TimeZone        System.out.println(            "The original timezone is: "            + DFormat.getTimeZone()                  .getDisplayName());          TimeZone time_zone            = TimeZone.getTimeZone("GMT");          // Modifying the time zone        DFormat.setTimeZone(time_zone);          // Getting the modified timezones        System.out.println(            "New TimeZone is: "            + DFormat.getTimeZone()                  .getDisplayName());    }}

输出:

The original timezone is: Coordinated Universal TimeNew TimeZone is: Greenwich Mean Time

例2 :

// Java code to illustrate// getTimeZone() method  import java.text.*;import java.util.*;  public class DateFormat_Demo {    public static void main(String[] argv)    {        // Initializing the first formatter        DateFormat DFormat            = DateFormat.getDateInstance();          // Converting the dateformat to string        String str = DFormat.format(new Date());          // Original TimeZone        System.out.println(            "The original timezone is: "            + DFormat.getTimeZone()                  .getDisplayName());          TimeZone time_zone            = TimeZone.getTimeZone("Pacific/Tahiti");          // Modifying the time zone        DFormat.setTimeZone(time_zone);          // Getting the modified timezones        System.out.println(            "New TimeZone is: "            + DFormat.getTimeZone()                  .getDisplayName());    }}

输出:

The original timezone is: Coordinated Universal TimeNew TimeZone is: Tahiti Time

参考资料: https://docs.oracle.com/javase/7/docs/api/java/text/DateFormat.html#setTimeZone(java.util.TimeZone)