When is the starting time of the lunar year number?

Five years ago, when I was exploring the law of the combination of branches and branches of the lunar calendar, I consulted relevant materials and learned that the starting and ending time of the lunar calendar was from beginning of spring to the day before beginning of spring the following year. For example, this year, the lunar calendar has entered the first month. Although the year number is Renchen (that is, the Year of the Loong), it is still in the stage of Xinmao (Year of the Rabbit), because spring has not yet arrived. In real life, many people think that the beginning and ending time of the lunar year number is from the first day of the first month to New Year's Eve, that is, the lunar year is a year number, based on the year numbers marked in mainstream media newspapers such as Xinhua Daily Telegraph, People's Daily, Guangming Daily and Economic Daily. Nevertheless, the author thinks that this view and understanding are wrong, and the year numbers marked by mainstream media and many local media are also wrong. To this end, I hope that all kinds of media will correct it and avoid misleading the masses with false information. Readers in Xianning City, Hubei Province