Problem solving process:

Because there are 30 days in June, 30÷7=4…2, which means there are 4 normal weeks.

I also know that there are five Mondays, and June 1 is not Saturday and Sunday, so the normal four weeks are counted from Monday.

In this way, the fifth Saturday month has two days, namely, Monday on the 29th and Tuesday on the 30th.

Therefore, it is concluded that June 30th is Tuesday.

Extended data

The knowledge point of this exam is the number of days per month.

Except February, the days of 1 1 month are fixed.

You can remember by the formula:

January is big, February is small, March is big, April is small, May is big and June is small;

July is big, August is big, September is small, October is big, November is small and December is big.

Among them, abortion is 30 days, big month is 3 1 day, February is 28 days in non-leap year and 29 days in leap year.