Date repeater.
SEASON_SECONDS
91 * 24 * 60 * 60
$now :
$summer :
$autumn :
$winter :
$spring :
$type :
next( $pointer = 'future')
returns the next occurance of this repeatable.
this( $pointer = 'future')
width()
returns the width (in seconds or months) of this repeatable.
__toString()
__construct( $type)