An ex-coworker of mine (a s.o.a.b., actually) was assigned to build a new module for our Java ERP that should have collected and analyzed customers' data (retail industry). He decided to split EVERY Calendar/Datetime field in its components (seconds, minutes, hours, day, month, year, day of week, bimester, trimester (!)) because "how else would I query for 'every monday'?"
