The current month must be August.
what is the current month?
We need to add the last monday of the previous month, and the first thursday of next month, and we will get 38.
To answer this we need a calendar, there we can see for example that:
if last month was July, the last monday was on 31.
Then the current month is August, and the next month is September.
The first thursday on September is the 7th, adding the two we get:
31 + 7 = 38
So we can conclude that we are in August.