Java 获取本周，本月的开始和结束日期

转载自：http://blog.csdn.net/kaven_lv/article/details/10053615

获取本周的周一和周日的日期：

 Calendar ca=Calendar.getInstance();

  SimpleDateFormat f=new SimpleDateFormat("yyyy-MM-dd");

  int dayOfWeek = ca.get(Calendar.DAY_OF_WEEK);

  //中国习惯：周一是一周的开始

    if (dayOfWeek==1) {

dayOfWeek=7;

}else{

dayOfWeek--;

}

//   Log.d("tag","dayofweek="+dayOfWeek+"min= "+ca.getActualMinimum(Calendar.DAY_OF_WEEK)+" max="+ca.getActualMaximum(Calendar.DAY_OF_WEEK));

  Calendar  cal=(Calendar)ca.clone();

   

  cal.add(Calendar.DATE,1-dayOfWeek);

  Date date1=cal.getTime();

  cal=(Calendar)ca.clone();

  cal.add(Calendar.DATE,7-dayOfWeek);

  Date date2=cal.getTime();

  String str1=f.format(date1);

  String str2=f.format(date2);

  Log.d("tag","date1="+str1+" date2="+str2);

获取本月一号和后一天的日期：

Calendar ca=Calendar.getInstance();

  SimpleDateFormat f=new SimpleDateFormat("yyyy-MM-dd");

  int maximum = ca.getActualMaximum(Calendar.DAY_OF_MONTH);

  int minmum=ca.getActualMinimum(Calendar.DAY_OF_MONTH);

  int day=ca.get(Calendar.DAY_OF_MONTH);

  Calendar cal=(Calendar)ca.clone();

  cal.add(Calendar.DATE, maximum-day);

  Date dateD=cal.getTime();

  String strD=f.format(dateD);

  cal=(Calendar)ca.clone();

  cal.add(Calendar.DATE, minmum-day);

  Date dateX=cal.getTime();

  String strX=f.format(dateX);

  Log.d("tag","dateD="+strD+" dateX="+strX);