计算2000年01月01日起到指定日的天数

技术  /  管理员 发布于 7年前   328

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

<?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."
\n"; 
$endday_from_startday=cal_start2end($end_day,$start_day); 
echo "该日距离$start_day 共 ".$endday_from_startday." 天"; 
?> 

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！！！！！