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计算2000年01月01日起到指定日的天数

 2001-01-17 16:30:32 来源:WEB开发网   
核心提示: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) { $star
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!!!!! 

Tags:计算 起到 指定

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