Monday is Teachers’ Day because Taiwan decided, in 1952, that Confucius was born on 28 September.
The older Republican calendar had tried other dates. In the early 1930s some educators marked 6 June. In 1939 the Ministry of Education moved Teachers’ Day to the traditional lunar birthday of Confucius, the 27th day of the eighth lunar month, written as 27 August when officials simply copied the numeral onto the solar calendar. After the government moved to Taipei, scholars at what is now National Taiwan Normal University recalculated the conversion and put the solar date at 28 September. In 1952 the Executive Yuan asked the president to make that the official Confucius Birthday and Teachers’ Day. It has stayed there.
The civic ritual is the dawn ceremony at Confucius temples. Taipei Confucius Temple still starts around 6 a.m., with court music, the Yi dance and incense offered in the name of the president. Students from local high schools fill the attendant roles. Visitors who want a seat line up before first light. The 2025 ceremony followed the same script; 2026 will too, holiday Monday or not.
Teachers’ Day was a full national holiday for decades, then slipped to a commemorative date without a day off after the five-day workweek settled. Recent commemoration-day legislation put the holiday back on the calendar. In 2026 it falls on Monday, so the Mid-Autumn Friday and Teachers’ Day Monday lock together.
The history is administrative, not mystical. Nobody in 1952 claimed to have found a new bamboo slip with a birth hour. They chose a solar date the school system could plan around, after an August date had landed in summer vacation. The temples kept the sacrifice. The Ministry of Education kept the citations for senior teachers.
If you want the institutional version of the island’s past, the National Museum of Taiwan History in Tainan holds the longer arc; its English pages are at nmth.gov.tw/en. For this Friday’s letter, the near anniversary is Monday’s date, three days off the briefing, closer than 21 September and far closer than National Day on 10 October.