Java SimpleTimeZone inDaylightTime()方法及示例

Java中 SimpleTimeZone类 的 inDaylightTime( Date )方法 用于检查和验证给定日期是否在夏令时。

语法

public boolean inDaylightTime(Date date)

参数： 该方法需要一个 Date 类型的参数date，这是需要验证的给定日期。

返回值： 如果传递的日期在夏令时方面是无效的，该方法返回布尔值True，否则该方法返回布尔值False。

下面的程序说明了在Java中使用inDaylightTime()方法的情况：
例1 :

// Java code to demonstrate
// inDaylightTime() method
  
import java.util.*;
  
public class SimpleTimeZone_Demo {
    public static void main(String[] args)
    {
        // Creating a time zone object
        SimpleTimeZone simtimeobj
            = new SimpleTimeZone(540, "GMT");
  
        // Creating date object
        Date dt = new Date();
  
        // Verifying daylight
        boolean bool_daylight
            = simtimeobj.inDaylightTime(dt);
  
        // Checking the value of day light
        System.out.println("Is it in day"
                           + " light saving time? "
                           + bool_daylight);
    }
}

输出:

Is it in day light saving time? false

例2 :

// Java code to demonstrate
// inDaylightTime() method
  
import java.util.*;
  
public class SimpleTimeZone_Demo {
    public static void main(String[] args)
    {
        // Creating a time zone object
        SimpleTimeZone simtimeobj
            = new SimpleTimeZone(400, "AUS");
  
        // Creating a Calendar object
        Calendar c1 = Calendar.getInstance();
  
        // Set Month
        // MONTH starts with 0 i.e.(0 - Jan)
        c1.set(Calendar.MONTH, 00);
  
        // Set Date
        c1.set(Calendar.DATE, 30);
  
        // Set Year
        c1.set(Calendar.YEAR, 2019);
  
        // Creating a date object
        // with specified time.
        Date dt = c1.getTime();
  
        // Verifying daylight
        boolean bool_daylight
            = simtimeobj.inDaylightTime(dt);
  
        // Checking the value of day light
        System.out.println("Is it in day"
                           + " light saving time? "
                           + bool_daylight);
    }
}

输出: