Update holidays/countries/thailand.py
@@ -82,6 +82,8 @@ class Thailand(HolidayBase):
# Coronation Day.
if year <= 2016:
+ add_holiday(date(year, MAY, 5), "Coronation Day")
+ elif year >= 2020:
add_holiday(date(year, MAY, 4), "Coronation Day")
# Queen's Birthday.
