php中的时间处理
<P><?<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);<BR> $hour = split(":",$buf);<BR> if(eregi("pm",$buf))<BR> $hour += 12;<BR> return mktime($hour,$hour,$hour,$year,$year,$year);<BR> }else {<BR> $year = split("[-/]",$d);<BR> return mktime(0,0,0,$year,$year,$year);<BR> }<BR>}<BR>}<BR><BR>/**<BR>*<BR>* DateAdd(interval,number,date)<BR>* 返回已添加指定时间间隔的日期。<BR>* Inetrval为表示要添加的时间间隔字符串表达式，例如分或天<BR>* number为表示要添加的时间间隔的个数的数值表达式<BR>* Date表示日期<BR>*<BR>* Interval(时间间隔字符串表达式)可以是以下任意值: <BR>*yyyy year年 <BR>*q Quarter季度 <BR>*m Month月 <BR>*y Day of year一年的数 <BR>*d Day天 <BR>*w Weekday一周的天数 <BR>*ww Week of year周 <BR>*h Hour小时 <BR>*n Minute分 <BR>*s Second秒 <BR>*w、y和d的作用是完全一样的，即在目前的日期上加一天，q加3个月，ww加7天。 <BR>*/<BR>function DateAdd($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 $retval;<BR>} <BR><BR>?><BR><BR><BR><BR><?<BR>// 测试例<BR>$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<br>";<BR>echo $d1."的10天前是".date("Y-m-d",dateadd("d",-10,$d1))."<br>";<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<br>";<BR><BR>?> </P>
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