Taoism did not begin with the founder of Zhang Daoling.
The Taoist calendar is a special calendar for Taoism. The system is based on the China summer calendar and uses a 60-year calendar. The calculation method began in the era of the Yellow Emperor (2697 BC), and the current calendar (2002 BC) is 4699. In the Tang Dynasty, Laozi was the ancestor, and the year of Laozi's birth (1300 BC) was the beginning of the Taoist calendar, but after the Song Dynasty, the era of the Yellow Emperor was still used. However, Taoism fasted the Dojo and typed scripts with tables. All the books are based on the age of Tian Yun Jiazi, so there is no need to calculate the year because of the gods.
Buddha was born in 623 BC, enlightened in 588 BC and died in 543 BC. Three years later, 1954, the annual meeting was held in Yangon, Myanmar. At the meeting, it was decided that Buddhist countries should adopt the "Buddhist calendar" era, with Sakyamuni's nirvana day as the benchmark, and 1954 as the Buddhist calendar of 2498.
Immortals are precious and infinite people.
Wu Fusheng Tianzun