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Palco Meta

$meta_query = array(
	'relation' => 'AND',
	array(
		'key'     => 'dia_da_palestra',
		'value'   => 'current_time('d/m/Y');',
		'compare' => '=',
		'type'    => 'CHAR',
	),
	array(
		'key'     => 'inicio',
		'value'   => 'current_time('H:i')',
		'compare' => '>=',
		'type'    => 'CHAR',
	),
	array(
		'key'     => 'fim',
		'value'   => 'current_time('H:i')',
		'compare' => '<=',
		'type'    => 'CHAR',
	),
);