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;