怎么去时间差

[xk_520]

$daytime=12 //相隔的天数
$datetime=2010-03-04 时间
1 怎么取得$datetime前 $daytime 的时间

[ghostwuboy]

$daytime=12;
$datetime="2010-03-04";
echo date("Y-m-d", strtotime($datetime) - 86400*12);

[ghostwuboy]

$daytime=12;
$datetime="2010-03-04";
echo date("Y-m-d", strtotime($datetime) - 86400*$daytime);

[thinkinginAOCP]

LZ的结贴律,顶呐!

[Abin-2008]

[Quote=引用 1 楼 iseagold 的回复:]

PHP code

$daytime=12;
$datetime="2010-03-04";
echo date("Y-m-d", strtotime($datetime) - 86400*12);
[/Quote]
算的真准...

[xuzuning]

$daytime = 12; //相隔的天数
$datetime = '2010-03-04';// 时间
echo date('Y-m-d', strtotime("-$daytime day $datetime")); //out 2010-02-20

[程序猿之殇]

echo date('Y-m-d', strtotime('-12 days 2010-03-04'));
看看手册就知道这个函数的强大了.

[程序猿之殇]

echo date('Y-m-d', strtotime('-12 day 2010-03-04'));
看看手册就知道这个函数的强大了.

[kyzy_yy_pm]

lz结贴率听怪异

[mu_rain]

/**
 * 返回给指定的日期添加天数后的日期
 *
 * @param string $date	被添加的日期
 * @param int $addDay	添加的天数
 * @return string
 */
function dateAdd($date, $addDay){
   $parts = explode(' ', $date);
   $date = $parts[0];
   $time = $parts[1];
   $ymd = explode('-', $date);
   $hms = explode(':', $time);
   $year = $ymd[0];
   $month = $ymd[1];
   $day = $ymd[2];
   $hour = $hms[0];
   $minute = $hms[1];
   $second = $hms[2];
   $day = $day+$addDay;  
   if($month=='1' || $month=='3' || $month=='5' || $month=='7' || $month=='8' || $month=='10' || $month=='12'){
      if($day>31){
         $day = $day - 31;
         $month++;
      }
   }
   if($month=='4' || $month=='6' || $month=='9' || $month=='11'){
      if($day>30){
         $day = $day - 30;
         $month++;
      }
   }
   if($month=='2'){
      if(checkRun($year)){
          //Feb has 29 days in leap year
         if($day>29){
            $day = $day - 29;
            $month++;
         }
      }
      else{
         if($day>28){
            $day = $day - 28;
            $month++;
         }
      }
   }
   if($month==13){
      $month = 1;
      $year++;
   }
   if(strlen($month)==1){$month = "0".$month;}
   if(strlen($day)==1){$day = "0".$day;}
   return $year . "-" . $month . "-" . $day;
}

/**
 * 验证是否是润年
 *
 * @param int $year 年份
 * @return boolean	如果是则返回True，否则返回False
 */
function checkRun($year){
   if($year%4==0 && ($year%100!=0 || $year%400==0) )
      return true;
   else
      return false;
}

/**
 * 将时间转化成秒
 * @param string $time
 */
function time_to_second($time) {
	if (is_time($time)) {
		$array_time = explode(':', $time);
		return $array_time[0]*3600+$array_time[1]*60+$array_time[2];
	} else {
		return 0;
	}
}

/**
 * 将时间转化为unix时间戳
 *
 * @param string $date
 * @return int 如果转化成功则返回unix时间戳，否则返回-1
 */
function format_date_to_unix($date){
	$date = trim($date);
	$regexp = '^([0-9]{4})-([0-9]{1,2})-([0-9]{1,2})( ([0-9]{1,2}):([0-9]{1,2}):([0-9]{1,2}))?$';
	if(ereg($regexp,$date,$regs)){
		return mktime($regs[5],$regs[6],$regs[7],$regs[2],$regs[3],$regs[1]);
	}else{
		return -1;
	}
}

/**
 * Calculation of the time the auction closes
 * @param int $begin	unix timestamp
 * @param int $end		unix timestamp
 * @return string	The time the auction closes
 */
function date_between($begin, $end = 0, $between = FALSE)
{
	if ($end === 0) $end = time();
	if ($between === FALSE) $between = $begin - $end;
	if($between < 0) return '';
	if ($between < 60)
	{
		return $between.'秒';
	}
	else
	{
		$second  = $between % 60;
		$between = $between / 60;
		if ($between < 60)
		{
			return (int)$between."分".$second."秒";
		}
		else if($between === 60)
		{
			return "1小时";
		}
		else
		{
			$minute = $between % 60;
			$between = ($between - $minute) / 60;
			if ($between < 24)
			{
				$string = (int)$between."小时";
				if ($minute > 0)
				{
					$string .= $minute."分";
				}
				return $string;
			}
			else if($between === 24)
			{
				return "1天";
			}
			else
			{
				$hour	 = $between % 24;
				$between = $between - $hour;
				$day	 = $between / 24;
				$string = (int)$day."天";
				if ($hour > 0)
				{
					$string .= $hour."小时";
				}
				if ($minute > 0)
				{
					$string .= $minute."分";
				}
				return $string;
			}
		}
	}
}

[江南昆虫]

多看看手册，好好利用系统函数啊...