Timestamp.php

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<?php
class MWTimestamp {
        private static $formats = array(
                TS_UNIX => 'U',
                TS_MW => 'YmdHis',
                TS_DB => 'Y-m-d H:i:s',
                TS_ISO_8601 => 'Y-m-d\TH:i:s\Z',
                TS_ISO_8601_BASIC => 'Ymd\THis\Z',
                TS_EXIF => 'Y:m:d H:i:s', // This shouldn't ever be used, but is included for completeness
                TS_RFC2822 => 'D, d M Y H:i:s',
                TS_ORACLE => 'd-m-Y H:i:s.000000', // Was 'd-M-y h.i.s A' . ' +00:00' before r51500
                TS_POSTGRES => 'Y-m-d H:i:s',
                TS_DB2 => 'Y-m-d H:i:s',
        );

        private static $units = array(
                "milliseconds" => 1,
                "seconds" => 1000, // 1000 milliseconds per second
                "minutes" => 60, // 60 seconds per minute
                "hours" => 60, // 60 minutes per hour
                "days" => 24 // 24 hours per day
        );

        private $timestamp;

        public function __construct( $timestamp = false ) {
                $this->setTimestamp( $timestamp );
        }

        public function setTimestamp( $ts = false ) {
                $da = array();
                $strtime = '';

                if ( !$ts || $ts === "\0\0\0\0\0\0\0\0\0\0\0\0\0\0" ) { // We want to catch 0, '', null... but not date strings starting with a letter.
                        $uts = time();
                        $strtime = "@$uts";
                } elseif ( preg_match( '/^(\d{4})\-(\d\d)\-(\d\d) (\d\d):(\d\d):(\d\d)$/D', $ts, $da ) ) {
                        # TS_DB
                } elseif ( preg_match( '/^(\d{4}):(\d\d):(\d\d) (\d\d):(\d\d):(\d\d)$/D', $ts, $da ) ) {
                        # TS_EXIF
                } elseif ( preg_match( '/^(\d{4})(\d\d)(\d\d)(\d\d)(\d\d)(\d\d)$/D', $ts, $da ) ) {
                        # TS_MW
                } elseif ( preg_match( '/^-?\d{1,13}$/D', $ts ) ) {
                        # TS_UNIX
                        $strtime = "@$ts"; // http://php.net/manual/en/datetime.formats.compound.php
                } elseif ( preg_match( '/^\d{2}-\d{2}-\d{4} \d{2}:\d{2}:\d{2}.\d{6}$/', $ts ) ) {
                        # TS_ORACLE // session altered to DD-MM-YYYY HH24:MI:SS.FF6
                        $strtime = preg_replace( '/(\d\d)\.(\d\d)\.(\d\d)(\.(\d+))?/', "$1:$2:$3",
                                        str_replace( '+00:00', 'UTC', $ts ) );
                } elseif ( preg_match( '/^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2})(?:\.*\d*)?Z$/', $ts, $da ) ) {
                        # TS_ISO_8601
                } elseif ( preg_match( '/^(\d{4})(\d{2})(\d{2})T(\d{2})(\d{2})(\d{2})(?:\.*\d*)?Z$/', $ts, $da ) ) {
                        #TS_ISO_8601_BASIC
                } elseif ( preg_match( '/^(\d{4})\-(\d\d)\-(\d\d) (\d\d):(\d\d):(\d\d)\.*\d*[\+\- ](\d\d)$/', $ts, $da ) ) {
                        # TS_POSTGRES
                } elseif ( preg_match( '/^(\d{4})\-(\d\d)\-(\d\d) (\d\d):(\d\d):(\d\d)\.*\d* GMT$/', $ts, $da ) ) {
                        # TS_POSTGRES
                } elseif (preg_match( '/^(\d{4})\-(\d\d)\-(\d\d) (\d\d):(\d\d):(\d\d)\.\d\d\d$/', $ts, $da ) ) {
                        # TS_DB2
                } elseif ( preg_match( '/^[ \t\r\n]*([A-Z][a-z]{2},[ \t\r\n]*)?' . # Day of week
                                                                '\d\d?[ \t\r\n]*[A-Z][a-z]{2}[ \t\r\n]*\d{2}(?:\d{2})?' .  # dd Mon yyyy
                                                                '[ \t\r\n]*\d\d[ \t\r\n]*:[ \t\r\n]*\d\d[ \t\r\n]*:[ \t\r\n]*\d\d/S', $ts ) ) { # hh:mm:ss
                        # TS_RFC2822, accepting a trailing comment. See http://www.squid-cache.org/mail-archive/squid-users/200307/0122.html / r77171
                        # The regex is a superset of rfc2822 for readability
                        $strtime = strtok( $ts, ';' );
                } elseif ( preg_match( '/^[A-Z][a-z]{5,8}, \d\d-[A-Z][a-z]{2}-\d{2} \d\d:\d\d:\d\d/', $ts ) ) {
                        # TS_RFC850
                        $strtime = $ts;
                } elseif ( preg_match( '/^[A-Z][a-z]{2} [A-Z][a-z]{2} +\d{1,2} \d\d:\d\d:\d\d \d{4}/', $ts ) ) {
                        # asctime
                        $strtime = $ts;
                } else {
                        throw new TimestampException( __METHOD__ . " : Invalid timestamp - $ts" );
                }

                if( !$strtime ) {
                        $da = array_map( 'intval', $da );
                        $da[0] = "%04d-%02d-%02dT%02d:%02d:%02d.00+00:00";
                        $strtime = call_user_func_array( "sprintf", $da );
                }

                try {
                        $final = new DateTime( $strtime, new DateTimeZone( 'GMT' ) );
                } catch(Exception $e) {
                        throw new TimestampException( __METHOD__ . ' Invalid timestamp format.' );
                }

                if( $final === false ) {
                        throw new TimestampException( __METHOD__ . ' Invalid timestamp format.' );
                }
                $this->timestamp = $final;
        }

        public function getTimestamp( $style = TS_UNIX ) {
                if( !isset( self::$formats[$style] ) ) {
                        throw new TimestampException( __METHOD__ . ' : Illegal timestamp output type.' );
                }

                if( is_object( $this->timestamp  ) ) {
                        // DateTime object was used, call DateTime::format.
                        $output = $this->timestamp->format( self::$formats[$style] );
                } elseif( TS_UNIX == $style ) {
                        // Unix timestamp was used and is wanted, just return it.
                        $output = $this->timestamp;
                } else {
                        // Unix timestamp was used, use gmdate().
                        $output = gmdate( self::$formats[$style], $this->timestamp );
                }

                if ( ( $style == TS_RFC2822 ) || ( $style == TS_POSTGRES ) ) {
                        $output .= ' GMT';
                }

                return $output;
        }

        public function getHumanTimestamp() {
                $then = $this->getTimestamp( TS_UNIX );
                $now = time();
                $timeago = ($now - $then) * 1000;
                $message = false;

                foreach( self::$units as $unit => $factor ) {
                        $next = $timeago / $factor;
                        if( $next < 1 ) {
                                break;
                        } else {
                                $timeago = $next;
                                $message = array( $unit, floor( $timeago ) );
                        }
                }

                if( $message ) {
                        $initial = call_user_func_array( 'wfMessage', $message );
                        return wfMessage( 'ago', $initial );
                } else {
                        return wfMessage( 'just-now' );
                }
        }

        public function __toString() {
                return $this->getTimestamp();
        }
}

class TimestampException extends MWException {}