Often they don’t. Time-to-business-date is a business or legal rule, not a celestial one. The “day” often ends at 5pm. Trading systems may have eod at 2. If you deposit a cheque into a machine at 5:30pm on Thursday, that is posted Friday. A trade at 3pm is next-day. Heaven forbid you have a global operation.
Yeah this is my experience too. Often there is a time or times associated with a date but they can be difficult/impossible to deduce and many intuitive answers are wrong or riddled with important exceptions.
