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

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>

function cal_start2end($end_day,$start_day) {

<?php
//    计算从2000年01月01日开始到某日的天数

$start_day=ereg_replace(“-“,””,$start_day);
$end_day=ereg_replace(“-“,””,$end_day);

function cal_start2end($end_day,$start_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)) {

$start_day=ereg_replace(“-“,””,$start_day);
$end_day=ereg_replace(“-“,””,$end_day);

if( is_int(substr($end_day,0,4)/4) ) $leap_day=29; //leap year else
$leap_day=28;

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))
        {

// //同一年

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
$endday_from_startday=$end_day-$start_day+1;

//            //同一年

} else { // not same month

        if(substr($end_day,4,2)==substr($start_day,4,2))
            {
//            the same month  
            $endday_from_startday=$end_day-$start_day+1;

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; }

            }
        else
            {
//             not same month

return ($endday_from_startday);

            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;
            }

} else { // 不同年!

return ($endday_from_startday);

$differ_year=substr($end_day,0,4)-substr($start_day,0,4);

        }
    else
        {
//        不同年!

$how_int_4_floor=floor($differ_year/4)+1; // 向下取整
$how_int_4_ceil=ceil($differ_year/4)+1; // 向上取整

$differ_year=substr($end_day,0,4)-substr($start_day,0,4);

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;

$how_int_4_floor=floor($differ_year/4)+1; // 向下取整
$how_int_4_ceil=ceil($differ_year/4)+1; // 向上取整

$how_noleap_year=$differ_year-$how_leap_year;

if($how_澳门新葡亰手机版,int_4_floor==$how_int_4_ceil)
    $how_leap_year=$how_int_4_floor-1;
else
    $how_leap_year=$how_int_4_floor;