If $$19^{}\text{th}$$March is Monday, what day of the week is $$1$$\textsuperscript{st~}March ? 
Overseas Competition->Knowledge Point->Word Problem Modules->Periodic Problems->Periodic Problems of Time
There are 19 days between $$19^{}\text{th}$$March and~ $$1$$\textsuperscript{st~}March.  Apart from $19$\textsuperscript{th} March itself, there are $18$ days,  18 days = 2 week and 4 days.  Therefore,~~$$1$$\textsuperscript{st~}March is Thursday. 