php中的时间处理

haidong

<>&lt;?<BR>/**<BR>* 转换为UNIX时间戳<BR>*/<BR>function gettime($d) {<BR>  if(is_numeric($d))<BR>    return $d;<BR>  else {<BR>    if(! is_string($d)) return 0;<BR>    if(ereg(":",$d)) {<BR>      $buf = split(" +",$d);<BR>      $year = split("[-/]",$buf[0]);<BR>      $hour = split(":",$buf[1]);<BR>      if(eregi("pm",$buf[2]))<BR>        $hour[0] += 12;<BR>      return mktime($hour[0],$hour[1],$hour[2],$year[1],$year[2],$year[0]);<BR>    }else {<BR>      $year = split("[-/]",$d);<BR>      return mktime(0,0,0,$year[1],$year[2],$year[0]);<BR>    }<BR>  }<BR>}<BR><BR>/**<BR>*<BR>* DateAdd(interval,number,date)<BR>* 返回已添加指定时间间隔的日期。<BR>* Inetrval为表示要添加的时间间隔字符串表达式，例如分或天<BR>* number为表示要添加的时间间隔的个数的数值表达式<BR>* Date表示日期<BR>*<BR>* Interval(时间间隔字符串表达式)可以是以下任意值: <BR>*  yyyy year年 <BR>*  q Quarter季度 <BR>*  m Month月 <BR>*  y Day of year一年的数 <BR>*  d Day天 <BR>*  w Weekday一周的天数 <BR>*  ww Week of year周 <BR>*  h Hour小时 <BR>*  n Minute分 <BR>*  s Second秒 <BR>*  w、y和d的作用是完全一样的，即在目前的日期上加一天，q加3个月，ww加7天。 <BR>*/<BR>function DateAdd($interval, $number, $date) {<BR>  $date = gettime($date);<BR>  $date_time_array = getdate($date); <BR>  $hours = $date_time_array["hours"]; <BR>  $minutes = $date_time_array["minutes"]; <BR>  $seconds = $date_time_array["seconds"]; <BR>  $month = $date_time_array["mon"]; <BR>  $day = $date_time_array["mday"]; <BR>  $year = $date_time_array["year"]; <BR>  switch ($interval) { <BR>    case "yyyy": $year +=$number; break; <BR>    case "q": $month +=($number*3); break; <BR>    case "m": $month +=$number; break; <BR>    case "y": <BR>    case "d": <BR>    case "w": $day+=$number; break; <BR>    case "ww": $day+=($number*7); break; <BR>    case "h": $hours+=$number; break; <BR>    case "n": $minutes+=$number; break; <BR>    case "s": $seconds+=$number; break; <BR>  } <BR>  $timestamp = mktime($hours ,$minutes, $seconds,$month ,$day, $year); <BR>  return $timestamp;<BR>} <BR><BR>/**<BR>* DateDiff(interval,date1,date2)<BR>* 返回两个日期之间的时间间隔<BR>* intervals(时间间隔字符串表达式)可以是以下任意值: <BR>*   w  周<BR>*   d  天<BR>*   h  小时<BR>*   n  分钟<BR>*   s  秒<BR>*/<BR>function DateDiff ($interval, $date1,$date2) { <BR>  // 得到两日期之间间隔的秒数 <BR>  $timedifference = gettime($date2) - gettime($date1); <BR>  switch ($interval) { <BR>    case "w": $retval = bcdiv($timedifference ,604800); break; <BR>    case "d": $retval = bcdiv( $timedifference,86400); break; <BR>    case "h": $retval = bcdiv ($timedifference,3600); break; <BR>    case "n": $retval = bcdiv( $timedifference,60); break; <BR>    case "s": $retval = $timedifference; break; <BR>  } <BR>  return $retval;<BR>} <BR><BR>?&gt;<BR><BR><BR><BR>&lt;?<BR>// 测试例<BR>$d1 = "2002-01-11";<BR>$d2 = date("Y-m-d",dateadd("d",15,$d1));<BR><BR>echo $d1."的". datediff("d",$d1,$d2)."天后是$d2&lt;br&gt;";<BR>echo $d1."的10天前是".date("Y-m-d",dateadd("d",-10,$d1))."&lt;br&gt;";<BR>$d3 = date("Y/m/d H:i:s");<BR>echo "现在是".$d3."距离2002/2/12 12:59:59还有".datediff("s",$d3,"2002/2/12 12:59:59")."秒&lt;br&gt;";<BR><BR>?&gt; </P>