Because computation of East Asian traditional calendar depends on time when various astronomical phenomenon occur, especially nowadays when almost all places that are still using the old calendar have switched to use the actual observed/predicted time for those astronomical phenomenon to occur based on modern scientific prediction methodology, yet the time standard being used to compute those traditional calendar differ in each regions and there are multiple occasions in different countries that the time used to compute the traditional calendar, do not directly correspond to the time when the standard time were changed. Is it viable to record such information in another region within tz database? Having such a region could also remind vendors in East Asia area that the world have more than one timezone when computing traditional East Asian calendar and also remind vendors outside East Asia that there are not just Chinese-time-based-Chinese-calendar when computing days, especially when it come to computing festivals based on the traditional East Asian calendars like Lunar New Year, Double Nine Festival, Winter Solstice and Mid-Autumn Festival.