转换时转换出库时间增加一天

Question

我正在尝试转换时区，但它增加了一天额外的java函数。

   ""  deActivationDate=2021-06-25T23:59:59.000+0000"";
    
                             SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSZ");
                             
                            try {
                                Date date =formatter.parse(deActivationDate);
                                deActivationDate=formatter.format(date);
                                LOGGER.info("time format  printing 1" +deActivationDate);//2021-06-26T04:29:59.000+0430
    
                                deActivationDate = deActivationDate.substring(0, deActivationDate.length()-2)+":30";
    
    LOGGER.info("time format  printing 2" +deActivationDate);//2021-06-26T04:29:59.000+04:30""

在上面的停用日期是25，当我给输入时，但在格式化后，它的转换为26，为什么有一天os得到了添加，如何避免它。

Answer 1

这是您的代码的修复方法。但我们建议不要使用子字符串方法。

String deActivationDate="2021-06-25T23:59:59.000+0000";
 
try {
  SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSZ");
  formatter.setTimeZone(TimeZone.getTimeZone("UTC"));
  Date date =formatter.parse(deActivationDate);
  deActivationDate=formatter.format(date);
  
  System.out.println("time format  printing 1: " +deActivationDate); 
  //2021-06-25T23:59:59.000+0000

  deActivationDate = deActivationDate.substring(0, 
  deActivationDate.length()-4)+"0430";
    
  System.out.println("time format  printing 2: " +deActivationDate); 
  //2021-06-25T23:59:59.000+0430

} catch (Exception e) {
  System.err.println(e.getMessage());
}