Sayyiduna Mughirah bin Shu'bah (may Allah be pleased with him) said: The impotent man is to be given a respite of one year from the time his case is presented before the ruler.
Imam Malik (may Allah have mercy on him) said: The respite is to be counted from the day the case is presented before the judge.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النكاح / 14293