Question: The king during  the 166th year of the Rattanakosin Kingdom of Thailand served for how many years and days?
Sentence (from "1948 in Thailand"): It was the 2nd year in the reign of King Bhumibol Adulyadej (Rama IX), and is reckoned as year 2491 (1 January – 31 March) and 2492 (1 April – 31 December) in the Buddhist Era.
Relevant evidence: Yes