Java中的日期 setTime() 方法及示例

Java Date 类的setTime()方法设置一个日期对象。它将日期对象设置为表示 1970 年 1 月 1 日 00:00:00 GMT 之后的时间毫秒数。
句法：

public void setTime(long time)

参数：该函数接受一个指定毫秒数的参数时间。

返回值： It方法没有返回值。

异常：该函数不抛出任何异常。

下面的程序演示了上述函数：

方案一：

// Java code to demonstrate
// setTime() function of Date class
  
import java.util.Date;
import java.util.Calendar;
public class GfG {
    // main method
    public static void main(String[] args)
    {
  
        // creating a date object with specified time.
        Date dateOne = new Date();
  
        System.out.println("Date initially: "
                           + dateOne);
  
        // Sets the time
        dateOne.setTime(1000);
  
        // Prints the time
        System.out.println("Date after setting"
                           + " the time: "
                           + dateOne);
    }
}

输出：

Date initially: Wed Jan 02 09:34:03 UTC 2019
Date after setting the time: Thu Jan 01 00:00:01 UTC 1970

方案二：

// Java code to demonstrate
// setTime() function of Date class
  
import java.util.Date;
import java.util.Calendar;
public class GfG {
    // main method
    public static void main(String[] args)
    {
  
        // creating a Calendar object
        Calendar c1 = Calendar.getInstance();
  
        // set Month
        // MONTH starts with 0 i.e. ( 0 - Jan)
        c1.set(Calendar.MONTH, 11);
  
        // set Date
        c1.set(Calendar.DATE, 05);
  
        // set Year
        c1.set(Calendar.YEAR, 1996);
  
        // creating a date object with specified time.
        Date dateOne = c1.getTime();
  
        System.out.println("Date initially: "
                           + dateOne);
  
        // Sets the time
        dateOne.setTime(1000999);
  
        // Prints the time
        System.out.println("Date after setting"
                           + " the time: "
                           + dateOne);
    }
}

输出：

Date initially: Thu Dec 05 09:32:53 UTC 1996
Date after setting the time: Thu Jan 01 00:16:40 UTC 1970