A year that is not divisible by 4 is a normal year, and February in a normal year is 28 days (leap year is 29 days).

28÷7=4

7 days 1 cycle, two, three, four, five, six, Sunday and one.

28 days is four cycles, and the 28th is the last day of the fourth cycle, that is, Monday, March 1 is Tuesday.

February is 28 days, plus March 1.

28+ 1=29 (days)

29÷7=4 (cycle) remaining 1 day.

The remaining 1 day depends on the first number of the period (the remaining 2 days depend on the second number of the period, the remainder is divisible, and the last day is the last number of the period).

The first day of this cycle is Tuesday.

So March 1 is Tuesday.