Learning Game: Calendar

In the unusual educational game "Calendar" you will have to complete the dates on the calendar. Everyone knows that a year consists of twelve months, with each month having twenty-eight to thirty-one days. Only six of the twelve months are thirty-one: January, March, May, July, August, October and December. The shortest month of the year is February. Depending on whether or not the year is a leap year, the number of days in the month depends on that. In a leap year, there are twenty-nine days in February and twenty-eight days in a normal year. In the game, you need to complete the dates of the three summer months on the calendar.