March $$12$$th, $$2012$$ was a Monday. What day was May $$1$$st, $$2015$$? 
Overseas Competition->Knowledge Point->Word Problem Modules->Periodic Problems->Periodic Problems of Time->Period of Dates
March $$12$$th, $$2013$$: Tuesday  March $$12$$th, $$2014$$: Wednesday  March $$12$$th, $$2014$$: Thursday  $(31-12)+30+1=50$, $50\div 7=7\textbackslash{} \rm r \textasciitilde1$, so it was Friday. 