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Java ZonedDateTime minusDays()用法及代碼示例


ZonedDateTime類的minusDays()方法用於從此ZonedDateTime中減去指定的天數並返回ZonedDateTime的副本。此方法從本地日期時間中減去作為參數傳遞的天數,然後將其轉換回ZonedDateTime,使用區域ID來獲取偏移量。當轉換回ZonedDateTime時,如果本地日期時間重疊,則將盡可能保留偏移量,否則將使用較早的偏移量。此實例是不可變的,不受此方法調用的影響。

用法:

public ZonedDateTime minusDays(long days)

參數:此方法接受單個參數days,該參數代表要減去的天數,可以為負數。


返回值:此方法基於此日期時間並減去天後返回ZonedDateTime。

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minusDays()方法:
示例1:

// Java program to demonstrate 
// ZonedDateTime.minusDays() 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 days: "
                           + zoneddatetime); 
  
        // subtract 13 days 
        ZonedDateTime returnvalue 
            = zoneddatetime.minusDays(13); 
  
        // print result 
        System.out.println("ZonedDateTime after "
                           + " subtracting 13 days: "
                           + returnvalue); 
    } 
}
輸出:

ZonedDateTime before subtracting days: 2018-12-06T19:21:12.123+05:30[Asia/Calcutta]
ZonedDateTime after subtracting 13 days: 2018-11-23T19:21:12.123+05:30[Asia/Calcutta]

示例2:

// Java program to demonstrate 
// ZonedDateTime.minusDays() 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 days: "
                           + zoneddatetime); 
  
        // subtract 22 days 
        ZonedDateTime returnvalue 
            = zoneddatetime.minusDays(20); 
  
        // print result 
        System.out.println("ZonedDateTime after "
                           + " subtracting 24 days: "
                           + returnvalue); 
    } 
}
輸出:

ZonedDateTime before subtracting days: 2018-10-25T23:12:31.123+02:00[Europe/Paris]
ZonedDateTime after subtracting 24 days: 2018-10-05T23:12:31.123+02:00[Europe/Paris]

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