The Year of the Dragon in 2024 is called the "year without spring" because there is no sign of the beginning of spring. The lunar calendar is not completely accurate as it determines dates based on the phases of the moon and the orbit of the sun.
A leap year in the solar calendar means February 29 and a leap month in the lunar calendar means adding one month after a certain month. The Gregorian calendar is a common daily calendar system in modern society and is widely used in business, government, and international communication.