If today is a Wednesday, then $$22$$ days ago was a． 
Overseas Competition->Knowledge Point->Word Problem Modules->Periodic Problems->Periodic Problems of Time
Today is Wednesday. $$21$$ days ago was Wednesday. $$22$$ days ago was Tuesday.  $\textasciitilde$  or  $\textasciitilde$  $$22\div7=3$$ weeks $$1$$ day.  $$1$$ day before Wednesday was a Tuesday. 