php中的时间处理

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