Is there a 3 1 in August?

Month of 3 1 day: January, March, May, July, August, October and December.

30-day months: April, June, September and November.

29-day month: February of leap year.

28-day month: February in a normal year.

Rules:

The average solar calendar year is divided into twelve months, the first month is 3 1 day, the second month is 30, and February is 28. The average calendar month is approximately equal to the average length of Wang Shuoyue (29.5306 days). There are certain rules for the size of months in the solar calendar. Before July, a single month was a big month and two months was a small month. After August, two months are big months and a single month is small, so January, March, Friday, July, August, October and December are big months and April, June, September and November are small months.