Tra il 1° e l’ultimo giorno del mese
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$meta_query = array( 'relation' => 'AND', array( 'key' => 'evcal_srow', 'value' => '1575158400', 'compare' => '>=', ), array( 'key' => 'evcal_srow', 'value' => '1577750400', 'compare' => '<=', ), );