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+<?php
+/**
+ * Creation and parsing of MW-style timestamps.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ * @since 1.20
+ * @author Tyler Romeo, 2012
+ */
+use Wikimedia\Timestamp\ConvertibleTimestamp;
+
+/**
+ * Library for creating and parsing MW-style timestamps. Based on the JS
+ * library that does the same thing.
+ *
+ * @since 1.20
+ */
+class MWTimestamp extends ConvertibleTimestamp {
+	/**
+	 * Get a timestamp instance in GMT
+	 *
+	 * @param bool|string $ts Timestamp to set, or false for current time
+	 * @return MWTimestamp The instance
+	 */
+	public static function getInstance( $ts = false ) {
+		return new static( $ts );
+	}
+
+	/**
+	 * Get the timestamp in a human-friendly relative format, e.g., "3 days ago".
+	 *
+	 * Determine the difference between the timestamp and the current time, and
+	 * generate a readable timestamp by returning "<N> <units> ago", where the
+	 * largest possible unit is used.
+	 *
+	 * @since 1.20
+	 * @since 1.22 Uses Language::getHumanTimestamp to produce the timestamp
+	 * @deprecated since 1.26 Use Language::getHumanTimestamp directly
+	 *
+	 * @param MWTimestamp|null $relativeTo The base timestamp to compare to (defaults to now)
+	 * @param User|null $user User the timestamp is being generated for
+	 *  (or null to use main context's user)
+	 * @param Language|null $lang Language to use to make the human timestamp
+	 *  (or null to use main context's language)
+	 * @return string Formatted timestamp
+	 */
+	public function getHumanTimestamp(
+		MWTimestamp $relativeTo = null, User $user = null, Language $lang = null
+	) {
+		if ( $lang === null ) {
+			$lang = RequestContext::getMain()->getLanguage();
+		}
+
+		return $lang->getHumanTimestamp( $this, $relativeTo, $user );
+	}
+
+	/**
+	 * Adjust the timestamp depending on the given user's preferences.
+	 *
+	 * @since 1.22
+	 *
+	 * @param User $user User to take preferences from
+	 * @return DateInterval Offset that was applied to the timestamp
+	 */
+	public function offsetForUser( User $user ) {
+		global $wgLocalTZoffset;
+
+		$option = $user->getOption( 'timecorrection' );
+		$data = explode( '|', $option, 3 );
+
+		// First handle the case of an actual timezone being specified.
+		if ( $data[0] == 'ZoneInfo' ) {
+			try {
+				$tz = new DateTimeZone( $data[2] );
+			} catch ( Exception $e ) {
+				$tz = false;
+			}
+
+			if ( $tz ) {
+				$this->timestamp->setTimezone( $tz );
+				return new DateInterval( 'P0Y' );
+			} else {
+				$data[0] = 'Offset';
+			}
+		}
+
+		$diff = 0;
+		// If $option is in fact a pipe-separated value, check the
+		// first value.
+		if ( $data[0] == 'System' ) {
+			// First value is System, so use the system offset.
+			if ( $wgLocalTZoffset !== null ) {
+				$diff = $wgLocalTZoffset;
+			}
+		} elseif ( $data[0] == 'Offset' ) {
+			// First value is Offset, so use the specified offset
+			$diff = (int)$data[1];
+		} else {
+			// $option actually isn't a pipe separated value, but instead
+			// a comma separated value. Isn't MediaWiki fun?
+			$data = explode( ':', $option );
+			if ( count( $data ) >= 2 ) {
+				// Combination hours and minutes.
+				$diff = abs( (int)$data[0] ) * 60 + (int)$data[1];
+				if ( (int)$data[0] < 0 ) {
+					$diff *= -1;
+				}
+			} else {
+				// Just hours.
+				$diff = (int)$data[0] * 60;
+			}
+		}
+
+		$interval = new DateInterval( 'PT' . abs( $diff ) . 'M' );
+		if ( $diff < 1 ) {
+			$interval->invert = 1;
+		}
+
+		$this->timestamp->add( $interval );
+		return $interval;
+	}
+
+	/**
+	 * Generate a purely relative timestamp, i.e., represent the time elapsed between
+	 * the given base timestamp and this object.
+	 *
+	 * @param MWTimestamp $relativeTo Relative base timestamp (defaults to now)
+	 * @param User $user Use to use offset for
+	 * @param Language $lang Language to use
+	 * @param array $chosenIntervals Intervals to use to represent it
+	 * @return string Relative timestamp
+	 */
+	public function getRelativeTimestamp(
+		MWTimestamp $relativeTo = null,
+		User $user = null,
+		Language $lang = null,
+		array $chosenIntervals = []
+	) {
+		if ( $relativeTo === null ) {
+			$relativeTo = new self;
+		}
+		if ( $user === null ) {
+			$user = RequestContext::getMain()->getUser();
+		}
+		if ( $lang === null ) {
+			$lang = RequestContext::getMain()->getLanguage();
+		}
+
+		$ts = '';
+		$diff = $this->diff( $relativeTo );
+		if ( Hooks::run(
+			'GetRelativeTimestamp',
+			[ &$ts, &$diff, $this, $relativeTo, $user, $lang ]
+		) ) {
+			$seconds = ( ( ( $diff->days * 24 + $diff->h ) * 60 + $diff->i ) * 60 + $diff->s );
+			$ts = wfMessage( 'ago', $lang->formatDuration( $seconds, $chosenIntervals ) )
+				->inLanguage( $lang )->text();
+		}
+
+		return $ts;
+	}
+
+	/**
+	 * Get the localized timezone message, if available.
+	 *
+	 * Premade translations are not shipped as format() may return whatever the
+	 * system uses, localized or not, so translation must be done through wiki.
+	 *
+	 * @since 1.27
+	 * @return Message The localized timezone message
+	 */
+	public function getTimezoneMessage() {
+		$tzMsg = $this->format( 'T' );  // might vary on DST changeover!
+		$key = 'timezone-' . strtolower( trim( $tzMsg ) );
+		$msg = wfMessage( $key );
+		if ( $msg->exists() ) {
+			return $msg;
+		} else {
+			return new RawMessage( $tzMsg );
+		}
+	}
+
+	/**
+	 * Get a timestamp instance in the server local timezone ($wgLocaltimezone)
+	 *
+	 * @since 1.22
+	 * @param bool|string $ts Timestamp to set, or false for current time
+	 * @return MWTimestamp The local instance
+	 */
+	public static function getLocalInstance( $ts = false ) {
+		global $wgLocaltimezone;
+		$timestamp = new self( $ts );
+		$timestamp->setTimezone( $wgLocaltimezone );
+		return $timestamp;
+	}
+}