How many days would there be in the first four months?

Answer 1

30. The fourth month is April, and April is in this rhyme:

Thirty days have September, April, June and November.

All the rest have thirty-one,

Except February alone,

Which has only twenty-eight days clear,

And twenty-nine in each leap year.

Answer 2

123 days 31+31+31+30=123