Java中的 TimeZone inDaylightTime() 方法及示例

Java中TimeZone 类的inDaylightTime( Date )方法用于检查和验证给定日期是否处于夏令时。

句法：

public abstract boolean 
    inDaylightTime(Date date)

参数：该方法接受一个Date类型的参数date ，即要验证的给定日期。

返回值：如果传递的日期相对于夏令时无效，则该方法返回布尔值 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：
示例 1：

// Java code to demonstrate
// inDaylightTime() method
  
import java.util.*;
  
public class SimpleTimeZone_Demo {
    public static void main(String[] args)
    {
        // Creating a TimeZone
        TimeZone offtime_zone
            = TimeZone.getTimeZone("Europe/Rome");
  
        // Creating date object
        Date dt = new Date();
  
        // Verifying daylight
        boolean bool_daylight
            = offtime_zone.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? true

示例 2：

// Java code to demonstrate
// inDaylightTime() method
  
import java.util.*;
  
public class SimpleTimeZone_Demo {
    public static void main(String[] args)
    {
        // Creating a TimeZone
        TimeZone offtime_zone
            = TimeZone.getTimeZone("Pacific/Pago_Pago");
  
        // Creating date object
        Date dt = new Date();
  
        // Verifying daylight
        boolean bool_daylight
            = offtime_zone.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

参考： https: Java Java.util.Date)