partial time range solution

time-range

/**
 * Returns a compact date range like March 27-29, 1977 from two unix time stamps. If $end is empty
 * or less than start returns start only.
 * 
 * @param int    $start Unix timestamp
 * @param int    $end Unix timestamp
 * @param string $round Least unit of time to include - supported values: day, hour, minute
 * @param string $include Largest unit of time to include - supported values: year, month, hour
 * 
 * Samples:
 * January 1, 2001 - January 1, 2002
 * January 1 - Februray 1, 2001
 * January 1 - 2, 2001
 * January 1, 2001
 * 
 * January 1, 2001 at 1pm - January 1, 2002 at 1pm
 * January 1, 2001 at 1pm - Februray 1, 2001 at 1pm
 * January 2001, 1st 1pm - 2nd 2pm
 * January 1, 2001 1pm - 2pm
 * 
 * 
 * @return string
 */
function human_time_range ( $start, $end, $round = 'day', $include = 'year' ) {


  $y = ( 'year' == $include ) ? ', Y' : '';
	$m = ( in_array( $include, array( 'month', 'year' ) ) ) ? 'F ' : '';
	$d = ( 'hour' != $include ) ? 'j' : '';

	if ($end != '' && $start < $end) {
		$year1  = date( 'Y', $start );
		$year2  = date( 'Y', $end );
		$month1 = date( 'm', $start );
		$month2 = date( 'm', $end );
		$day1   = date( 'd', $start );
		$day2   = date( 'd', $end );
		$hour1  = date( 'H', $start );
		$hour2  = date( 'H', $end );

		if ( $year1 != $year2 ) {
			return date('F j, Y', $start) . ' &ndash; ' . date('F j, Y', $end);
		} elseif ( $month1 != $month2 ) {
			return date('F j', $start) . '&ndash;' . date('F j', $end) . date(', Y', $end);
		} elseif ( $day1 != $day2 ) {
			return date('F j', $start) . '&ndash;' . date('j', $end) . date(', Y', $end);
		}
	}

	return date('F j, Y', $start);
}