wenpai.org/wp-content/plugins/o2/modules/time-shortcode/load.php

<?php
/**
 * Plugin: Time Shortcode
 * Original Author: Otto
 *
 * Usage: [time]any-valid-time-string-here[/time]
 * Put any attribute into the shortcode to have a date relative to the current time instead of the post/comment time
 * e.g. [time doitlive]any-valid-time-string-here[/time]
 * Will attempt to parse the time string and create a format that shows it in the viewers local time zone
 * Note that times should be complete with year, month, day, and hour and minute.. something strtotime can parse meaningfully.
 * Times are assumed to be UTC.
 * Conversion happens via Javascript and will depend on the users browser.
 **/

class o2_Time_Shortcode {

	/**
	 * Set the hooks for handling the time shortcode
	 **/
	public static function init() {

		add_shortcode( 'time', array( 'o2_Time_Shortcode', 'time_shortcode' ) );
		add_filter( 'comment_text', array( 'o2_Time_Shortcode', 'do_comment_time_shortcode' ) );
	}

	/**
	 * Process the time shortcode
	 *
	 * @param array $attr - parse relative to current time if any attribute is set
	 * @param string $content - Any valid strtotime string
	 * @return string - html content
	 **/
	public static function time_shortcode( $attr, $content = null ) {

		global $in_comment_content, $comment;

		// try to parse the time, relative to now or comment time or post time, in that order
		if( ! empty( $attr ) ) {
			$relative_time = false;
		} elseif ( $in_comment_content ) {
			$relative_time = strtotime( $comment->comment_date_gmt );
		} else {
			$relative_time = get_the_date( 'U' );
		}

		$time = self::parse_time( $content, $relative_time );

		// if that didn't work, give up
		if ( false === $time || -1 === $time ) {
			return $content;
		}

		$format = isset( $attr['format'] ) ? $attr['format'] : 'full';

		// build the link and abbr microformat
		$out = '<a href="http://www.timeanddate.com/worldclock/fixedtime.html?iso=' . gmdate( 'Ymd\THi', $time ) . '"><abbr class="globalized-date" title="' . gmdate( 'c', $time ) . '" data-time="' . absint( $time ) . '000" data-format="' . esc_attr( $format ) . '">' . $content . '</abbr></a>';

		// add the time converter JS code if not already added
		if ( ! has_action( 'wp_footer', array( 'o2_Time_Shortcode', 'time_conversion_script' ) ) ) {
			add_action( 'wp_footer', array( 'o2_Time_Shortcode', 'time_conversion_script' ) );
		}

		// return the new link
		return $out;
	}

	/**
	 * Convert a time string into an epoch timestamp
	 *
	 * @param string $date_string - Any valid strtotime string
	 * @param int $time (optional) - Epoch timestamp for relative date parsing
	 * @return mixed - int Epoch timestamp on success, false on fail
	 **/
	public static function parse_time( $date_string, $time = null ) {

		if ( empty( $date_string ) ) {
			return false;
		}

		if ( empty( $time ) ) {
			$time = time();
		}

		// Remove the word "at" from the string, if present. Allows strings like "Monday, April 6 at 19:00 UTC" to work
		$date_string = str_replace( ' at ', ' ', $date_string );

		// Convert all the random characters to html entities, then strip all html entities
		// This removes both bad unicode characters and html entities in one swoop
		// .+-/ characters are unnaffected by htmlentities, so strtotime won't break
		$date_string = htmlentities( $date_string, ENT_QUOTES );
		$html_entity_regex = '/&[^\s]*;/';
		$date_string = preg_replace( $html_entity_regex, ' ', $date_string );

		return strtotime( $date_string, $time );

	}

	/**
	 * Process the time shortcode and only the time shortcode in comments
	 *
	 * @param string $comment_text - The comment content
	 * @return string Modified comment content
	 **/
	public static function do_comment_time_shortcode( $comment_text ) {

		global $shortcode_tags, $in_comment_content;
		$in_comment_content = true;

		// save the shortcodes
		$original_tags = $shortcode_tags;

		// only process the time shortcode
		$shortcode_tags = array(
			'time' => array( 'o2_Time_Shortcode', 'time_shortcode' ),
		);

		// do the time shortcode on the comment
		$comment_text = do_shortcode( $comment_text );

		// restore the normal shortcodes
		$shortcode_tags = $original_tags;

		$in_comment_content = false;
		return $comment_text;
	}

	/**
	 * Render and enqueue the javascript that converts the raw time into local time
	 **/
	public static function time_conversion_script() {

		global $wp_locale; // These are strings that Core has already translated.

		?>
		<script type="text/javascript">

			var o2_get_time_settings = function() {
				return <?php echo json_encode( array(
					'months' => array_values( $wp_locale->month ),
					'days'   => array_values( $wp_locale->weekday ),
				) ); ?>;
			};

			jQuery( 'body' ).on( 'ready post-load ready.o2', function() {

				jQuery( 'abbr.globalized-date' ).each( function() {

					var $this = jQuery( this );

					//Valid elements will have an epoch timestamp in milliseconds on a data-time attribute
					var time = parseInt( $this.data( 'time' ), 10 );
					if( ! time || isNaN( time ) ) {
						return;
					}

					$this.text( o2_format_date( new Date( time ), $this.data( 'format' ) ) );

				} );
			} );

		</script>
		<?php

		wp_enqueue_script(
			'o2-time-shortcode',
			plugins_url( 'modules/time-shortcode/js/time-shortcode.js', O2__FILE__ ),
			array(),
			1.1,
			true
		);
	}
}
o2_Time_Shortcode::init();