Java ZonedDateTime minusMonths()用法及代碼示例

ZonedDateTime類的minusMonths()方法用於減去此ZonedDateTime中的月份數，並在減去後返回ZonedDateTime的副本。此實例是不可變的，不受此方法調用的影響。

用法:

public ZonedDateTime minusMonths(long months)

參數：此方法接受單個參數months，它代表要減去的月份，可以為負數。

返回值：此方法基於此日期時間返回一個ZonedDateTime，並減去月份，而不是null。

異常：如果結果超出支持的日期範圍，則此方法將引發DateTimeException。

以下示例程序旨在說明minusMonths()方法：
示例1:

// Java program to demonstrate 
// ZonedDateTime.minusMonths() method 
  
import java.time.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // create a ZonedDateTime object 
        ZonedDateTime zoneddatetime 
            = ZonedDateTime.parse( 
                "2018-12-06T19:21:12.123+05:30[Asia/Calcutta]"); 
  
        // print instance 
        System.out.println("ZonedDateTime before"
                           + " subtracting months: "
                           + zoneddatetime); 
  
        // subtract 10 months 
        ZonedDateTime returnvalue 
            = zoneddatetime.minusMonths(10); 
  
        // print result 
        System.out.println("ZonedDateTime after "
                           + " subtracting 10 months: "
                           + returnvalue); 
    } 
}

輸出：

ZonedDateTime before subtracting months: 2018-12-06T19:21:12.123+05:30[Asia/Calcutta]
ZonedDateTime after subtracting 10 months: 2018-02-06T19:21:12.123+05:30[Asia/Calcutta]

示例2:

// Java program to demonstrate 
// ZonedDateTime.minusMonths() method 
  
import java.time.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // create a ZonedDateTime object 
        ZonedDateTime zoneddatetime 
            = ZonedDateTime.parse( 
                "2018-10-25T23:12:31.123+02:00[Europe/Paris]"); 
  
        // print instance 
        System.out.println("ZonedDateTime before"
                           + " subtracting months: "
                           + zoneddatetime); 
  
        // subtract 2 months 
        ZonedDateTime returnvalue 
            = zoneddatetime.minusMonths(2); 
  
        // print result 
        System.out.println("ZonedDateTime after "
                           + " subtracting 2 months: "
                           + returnvalue); 
    } 
}

輸出：

ZonedDateTime before subtracting months: 2018-10-25T23:12:31.123+02:00[Europe/Paris]
ZonedDateTime after subtracting 2 months: 2018-08-25T23:12:31.123+02:00[Europe/Paris]

參考： https://docs.oracle.com/javase/10/docs/api/java/time/ZonedDateTime.html#minusMonths(long)

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注：本文由純淨天空篩選整理自AmanSingh2210大神的英文原創作品 ZonedDateTime minusMonths() method in Java with Examples。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。