A dentist performs dental services for a patient on April$20$; the total bill for the dental services was$$ $$200.$ The patient makes a$$ co$-$pay of$$ $$20$ on April$20,$ and the insurance company pays the remaining balance of$$ $$180$ on May $19.$ On what$$ date$($s$)$ will the dentist record the revenue for those dental services provided on April$20?$