java/javascript 通用算出一个月有多少天

  private static int getDaysOFMonth(String timeMonth) throws Exception { if (timeMonth == null) { throw new Exception("时间对象为空值"); } //格式不正确 正确格式YYYYMM if (timeMonth.length() < 6) { throw new Exception("时间格式不正确"); } Date Currentdate = new Date(Integer.parseInt(timeMonth.substring(0, 4)), Integer.parseInt(timeMonth.substring(4, 6)), 1); Date Lastdate = new Date(Integer.parseInt(timeMonth.substring(0, 4)), Integer.parseInt(timeMonth.substring(4, 6)) - 1, 1); long diffDays = Currentdate.getTime() - Lastdate.getTime(); return (int) (diffDays / (24 * 60 * 60 * 1000)); }// int days=getDaysOFMonth("200812"); 

 

 

 

/** * 当月天数 (YYYYMM) */ function daysOfMonth(Month) { var currentMonth=new Date(Month.substring(0,4),Month.substring(4,6),1); var lastMonth=new Date(Month.substring(0,4),Month.substring(4,6)-1,1); var diffDays=currentMonth-lastMonth; return (diffDays/( 24 * 60 * 60 * 1000)); }//alert(daysOfMonth('200812'));