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函数 <br> (算头也算尾)日期格式为：YYYY-MM-DD <br> <?php //;;;;计算从2000年01月01日开始到某日的天数 function cal_start2end($end_day,$start_day) { $start_day=ereg_replace("-","",$start_day); $end_day=ereg_replace("-","",$end_day); if($end_day>=$start_day) {;;;;//;;;;截止日期大于开始日期 ;;;;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 { //不同年！ $differ_year=substr($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; // 向上取整 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 "您输入的是：".$end_day."<br>n"$endday_from_startday=cal_start2end($end_day,$start_day); echo "该日距离$start_day 共 ".$endday_from_startday." 天"?> <br><br><br><br>时间太少了，那位大虾可以修改为计算任意两日期之间的间隔最好！！！！！;