In general: hours when most businesses are in operation. Although individual working hours may differ, and particular firms may choose staggered schedules, the conventional business day is 9 A.M. to 5 P.M.
Finance and investments: day when financial marketplaces are open for trading. In figuring the settlement date on a regular way securities transaction-which is the fifth business day after the trade date-Saturday, Sunday, and a legal holiday would not be counted, for example.




