计算2000年01月01日起到指定日的天数

这是一个计算2000年01月01日起到指定日的天数的因变量 <br> (算头也算尾)日子方法为：yyyy-mm-dd <br> <?php //    计划从2000年01月01日发端到某日的天数 function cal_start2end($end_day,$start_day) { $start_day=ereg_replace("-","",$start_day); $end_day=ereg_replace("-","",$end_day); if($end_day>=$start_day) {    //    截至日子大于发端日子     if(substr($end_day,0,4)==substr($start_day,0,4))         { if( is_int(substr($end_day,0,4)/4) )     $leap_day=29;    //leap year else     $leap_day=28; //            //同一年         if(substr($end_day,4,2)==substr($start_day,4,2))             { //            the same month              $endday_from_startday=$end_day-$start_day+1;             }         else             { //             not same month             switch (substr($end_day,4,2))                 {                 case "01":                         $endday_from_newyear=substr($end_day,6,2)+1;                         break;                 case "02":                         $endday_from_newyear=substr($end_day,6,2)+31;                         break;                 case "03":                         $endday_from_newyear=substr($end_day,6,2)+$leap_day+31;                         break;                 case "04":                         $endday_from_newyear=substr($end_day,6,2)+1+$leap_day+31*2;                         break;                 case "05":                         $endday_from_newyear=substr($end_day,6,2)+1+$leap_day+31*2+30;                         break;                 case "06":                         $endday_from_newyear=substr($end_day,6,2)+1+$leap_day+31*3+30;                         break;                 case "07":                         $endday_from_newyear=substr($end_day,6,2)+1+$leap_day+31*2+30*2;                         break;                 case "08":                         $endday_from_newyear=substr($end_day,6,2)+1+$leap_day+31*3+30*2;                         break;                 case "09":                         $endday_from_newyear=substr($end_day,6,2)+1+$leap_day+31*5+30*2;                         break;                 case "10":                         $endday_from_newyear=substr($end_day,6,2)+1+$leap_day+31*5+30*3;                         break;                 case "11":                         $endday_from_newyear=substr($end_day,6,2)+1+$leap_day+31*5+30*4;                         break;                 case "12":                         $endday_from_newyear=substr($end_day,6,2)+1+$leap_day+31*5+30*5;                         break;                 }             $endday_from_startday=$endday_from_newyear;             } return ($endday_from_startday);         }     else         { //        不同庚！ $differ_year=substr($end_day,0,4)-substr($start_day,0,4); $how_int_4_floor=floor($differ_year/4)+1; // 向下取整 $how_int_4_ceil=ceil($differ_year/4)+1; // 进取取整 if($how_int_4_floor==$how_int_4_ceil)     $how_leap_year=$how_int_4_floor-1; else     $how_leap_year=$how_int_4_floor; $how_noleap_year=$differ_year-$how_leap_year; $differ_year2day=$how_noleap_year*365+$how_leap_year*366; if( is_int(substr($end_day,0,4)/4) )     $leap_day=29;    //leap year else     $leap_day=28;         if(substr($end_day,4,2)==substr($start_day,4,2))             { //            the same month              $endday_from_startday=$differ_year2day+ substr($end_day,4,2);             }         else             { //             not same month             switch (substr($end_day,4,2))                 {                 case "01":                         $endday_from_newyear=substr($end_day,6,2)+1;                         break;                 case "02":                         $endday_from_newyear=substr($end_day,6,2)+1+31;                         break;                 case "03":                         $endday_from_newyear=substr($end_day,6,2)+1+$leap_day+31;                         break;                 case "04":                         $endday_from_newyear=substr($end_day,6,2)+1+$leap_day+31*2;                         break;                 case "05":                         $endday_from_newyear=substr($end_day,6,2)+1+$leap_day+31*2+30;                         break;                 case "06":                         $endday_from_newyear=substr($end_day,6,2)+1+$leap_day+31*3+30;                         break;                 case "07":                         $endday_from_newyear=substr($end_day,6,2)+1+$leap_day+31*2+30*2;                         break;                 case "08":                         $endday_from_newyear=substr($end_day,6,2)+1+$leap_day+31*3+30*2;                         break;                 case "09":                         $endday_from_newyear=substr($end_day,6,2)+1+$leap_day+31*5+30*2;                         break;                 case "10":                         $endday_from_newyear=substr($end_day,6,2)+1+$leap_day+31*5+30*3;                         break;                 case "11":                         $endday_from_newyear=substr($end_day,6,2)+1+$leap_day+31*5+30*4;                         break;                 case "12":                         $endday_from_newyear=substr($end_day,6,2)+1+$leap_day+31*5+30*5;                         break;                 } //end of switch     $endday_from_startday=$endday_from_newyear+$differ_year2day;     }    //end of  not same month  return ($endday_from_startday);         } //end of year }        //end of  $end_day>=$start_day } //end of function $start_day="2000-01-01"; $end_day="2011-01-01"; echo "您输出的是：".$end_day."<br>\n"; $endday_from_startday=cal_start2end($end_day,$start_day); echo "该日隔绝$start_day 共 ".$endday_from_startday." 天"; ?> <br><br><br><br>功夫太少了，那位大虾不妨窜改为计划大肆两日子之间的间隙最佳！！！！！