Time shortcode used for make p2's

time-shortcode.php

<?php
/**
 * Plugin: Time Shortcode
 * Author: Otto
 *
 * Usage: [time]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
 * Conversion happens via Javascript and will depend on the users browser.
 **/

add_action('init','time_shortcode_init');
function time_shortcode_init() {
	if ( ! class_exists( 'P2' ) )
		return;

	add_shortcode('time','time_shortcode');
}

function time_shortcode( $attr, $content = null ) {
	$post = get_post();
	
	// try to parse the time, relative to the post time
	$time = strtotime($content, get_the_date( 'U' ) );

	// if strtotime doesn't work, try stronger measures
	if ( $time === false || $time === -1 ) {
		$timearray = date_parse($content);
		foreach ( $timearray as $key => $value ) {
			if ( $value === false ) unset ( $timearray[$key] );
		}

		//merge the info from the post date with this one
		$posttime = date_parse( $post->post_date );
		$timearray = array_merge( $posttime, $timearray );

		// use the blog's timezone if none was specified
		if ( !isset( $timearray['tz_id'] ) ) {
			$timearray['tz_id'] = get_option('timezone_string');
		}

		// build a normalized time string, then parse it to an integer time using strtotime
		$time = strtotime("{$timearray['year']}-{$timearray['month']}-{$timearray['day']}T{$timearray['hour']}:{$timearray['minute']}:{$timearray['second']} {$timearray['tz_id']}");
	}
	
	// if that didn't work, give up
	if ( $time === false || $time === -1 ) {
		return $content;
	}
	
	// build the link and abbr microformat
	$out = '<a href="http://www.timeanddate.com/worldclock/fixedtime.html?iso='.gmdate('Ymd\THi', $time).'"><abbr class="date" title="'.gmdate('c', $time).'">'.$content.'</abbr></a>';
	
	// add the time converter JS code
	add_action('wp_footer','time_converter_script');

	// return the new link
	return $out;
}

function time_converter_script() {
	$timestrings = array(
		'months' => array(__('January'), __('February'), __('March'),__('April'),__('May'),__('June'),__('July'),__('August'),__('September'),__('October'),__('November'),__('December')),
		'days' => array( __('Sunday'),__('Monday'),__('Tuesday'),__('Wednesday'),__('Thursday'),__('Friday'),__('Saturday')),
	);
?>
	<script type="text/javascript">
	jQuery(document).ready( function ($) {
		var timestrings = <?php echo json_encode($timestrings); ?>
		
		var parse_date = function (text) {
			var m = /^([0-9]{4})-([0-9]{2})-([0-9]{2})T([0-9]{2}):([0-9]{2}):([0-9]{2})\+00:00$/.exec(text);
			var d = new Date();
			d.setUTCFullYear(+m[1]);
			d.setUTCDate(+m[3]);
			d.setUTCMonth(+m[2]-1);
			d.setUTCHours(+m[4]);
			d.setUTCMinutes(+m[5]);
			d.setUTCSeconds(+m[6]);
			return d;
		}
		var format_date = function (d) {
			var p = function(n) {return ('00'+n).slice(-2); };
			var tz = -d.getTimezoneOffset()/60;
			if (tz>=0) { tz = "+"+tz; }
			return ""+timestrings['days'][d.getDay()]+", "+timestrings['months'][d.getMonth()]+" "+p(d.getDate())+", "+d.getFullYear()+" "+p(d.getHours())+":"+p(d.getMinutes())+" UTC"+tz;
		}
		var nodes = document.getElementsByTagName('abbr');
		for (var i=0; i<nodes.length; ++i) {
			var node = nodes[i];
			if (node.className === 'date') {
				var d = parse_date(node.getAttribute('title'));
				if (d) {
					node.textContent = format_date(d);
				}
			}
		}
	});
	</script>
<?php
}

add_filter('comment_text', 'time_shortcode_in_comments');

function time_shortcode_in_comments($comment) {
	global $shortcode_tags;
	
	// save the shortcodes
	$saved_tags = $shortcode_tags;

	// only process the time shortcode
	unset($shortcode_tags);
	$shortcode_tags['time']='time_shortcode';

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

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

	return $comment;
}