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 (算头也算尾)日期格式为：YYYY-MM-DD =$start_day) { // 截止日期大于开始日期 if(substr($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."\n"; $endday_from_startday=cal_start2end($end_day,$start_day); echo "该日距离$start_day 共 ".$endday_from_startday." 天"; ?>

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