Start from the opening date.

The duration of the season card is three months, starting from the date of activation and ending on this day of the next month, which is one month. Three round-trips constitute one season.

The season card means that the game lasts for three months. Some are calculated based on three months of the natural month, and some are calculated based on the total hours of the three months of the natural month. Three months is called a quarter. In reality, January to March is the first quarter, April to June is the second quarter, July to September is the third quarter, and October to December is the fourth quarter, but in the game , the season card is not divided into seasons, but it is 3 months from the date the player opens the card, and the season card expires after 3 months.