获取一个月的开始时间和结束时间_获取一个月的开始和节数时间-优快云博客

本文介绍了一种在Java中获取指定日期所在月份第一天和最后一天的方法，并通过具体示例展示了如何获取上个月的起始和结束日期。

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Calendar c = Calendar.getInstance();

c.add(Calendar.MONTH, -1); //月份减1
Date lastMonth = c.getTime(); //结果

Log.i(TAG, "onCreate: -------开始时间----------"+getSupportBeginDayofMonth(lastMonth));
Log.i(TAG, "onCreate: -------结束时间-------------"+getSupportEndDayofMonth(lastMonth));

/**
 * 根据提供的年月日获取该月份的第一天
 */

public  String getSupportBeginDayofMonth(Date date) {

   date.getTime();

   Calendar startDate = Calendar.getInstance();
   startDate.setTime(date);
   startDate.set(Calendar.DAY_OF_MONTH, 1);
   startDate.set(Calendar.HOUR_OF_DAY, 0);
   startDate.set(Calendar.MINUTE, 0);
   startDate.set(Calendar.SECOND, 0);
   startDate.set(Calendar.MILLISECOND, 0);
   Date firstDate = startDate.getTime();
 //  SimpleDateFormat myFmt7=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
   SimpleDateFormat myFmt7=new SimpleDateFormat("yyyy-MM-dd");
   return myFmt7.format(firstDate);

 }

 /**
  * 根据提供的年月获取该月份的最后一天
  */
 public  String getSupportEndDayofMonth(Date date) {
   Calendar startDate = Calendar.getInstance();
   startDate.setTime(date);
   startDate.set(Calendar.DAY_OF_MONTH, startDate.getActualMaximum(Calendar.DAY_OF_MONTH));
   startDate.set(Calendar.HOUR_OF_DAY, 23);
   startDate.set(Calendar.MINUTE, 59);
   startDate.set(Calendar.SECOND, 59);
   startDate.set(Calendar.MILLISECOND, 999);
   Date firstDate = startDate.getTime();
//   SimpleDateFormat myFmt7=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
   SimpleDateFormat myFmt7=new SimpleDateFormat("yyyy-MM-dd");
   return myFmt7.format(firstDate);
 }