Why same days comes every year in the month of April and July?

Answer 1

The reason for this is because the number of weekdays more than an even number of weeks in a month is 7, therefore, the same number of days as the number of days in a week are gained. To clarify:

April = 30 days. Two extra days are gained.

May = 31 days. Three extra days are gained.

June = 30 days. Two extra days are gained.

Because this is a total of seven days, a whole extra week has passed in the year aside from an even four weeks to the month.