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Update Thailand holidays: extend support year down to 1914 #2166

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merged 7 commits into from
Dec 15, 2024
Merged

Update Thailand holidays: extend support year down to 1914 #2166

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009a9c9
Extend Thai LuniSolar calendar support down to 1914
PPsyrius Dec 12, 2024
4459030
Expand Thailand holidays down to 1914
PPsyrius Dec 12, 2024
2785a4a
Fixed up any remaining reference to the old start date
PPsyrius Dec 12, 2024
0485392
Merge branch 'dev' into th_holidays_historic
PPsyrius Dec 12, 2024
c4e2b4b
Update holidays/countries/thailand.py
PPsyrius Dec 14, 2024
e0b5c2c
Sort TH holidays logic by recentness, unify Rama VII-VIII holiday gap
PPsyrius Dec 14, 2024
91fad97
Merge branch 'dev' into th_holidays_historic
PPsyrius Dec 14, 2024
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34 changes: 25 additions & 9 deletions holidays/calendars/thai.py
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Original file line number Diff line number Diff line change
Expand Up @@ -22,7 +22,7 @@

class _ThaiLunisolar:
"""
** Thai Lunar Calendar Holidays only work from 1941 (B.E. 2484) onwards
** Thai Lunar Calendar Holidays only work from 1913 (B.E. 2456/2455) onwards
until 2157 (B.E. 2700) as we only have Thai year-type data for
cross-checking until then.

Expand Down Expand Up @@ -100,9 +100,15 @@ class _ThaiLunisolar:
2010-05-28
"""

# Athikawan (Extra-Day Year) list goes from 1941-2157 C.E.
# Athikawan (Extra-Day Year) list goes from 1914-2157 C.E.
# Copied off from 1757-2157 (B.E. 2300-2700) Thai Lunar Calendar
ATHIKAWAN_YEARS_GREGORIAN = {
1914,
1917,
1925,
1929,
1933,
1936,
1945,
1949,
1952,
Expand Down Expand Up @@ -147,10 +153,20 @@ class _ThaiLunisolar:
2153,
}

# Athikamat (Extra-Month Year) list goes from 1941-2157 C.E.:
# Athikamat (Extra-Month Year) list goes from 1914-2157 C.E.:
# Copied off from 1757-2157 (B.E. 2300-2700) Thai Lunar Calendar
# Approx formula as follows: (common_era-78)-0.45222)%2.7118886 < 1
ATHIKAMAT_YEARS_GREGORIAN = {
1915,
1918,
1920,
1923,
1926,
1928,
1931,
1934,
1937,
1939,
1942,
1944,
1947,
Expand Down Expand Up @@ -234,12 +250,12 @@ class _ThaiLunisolar:
}

# While Buddhist Holy Days have been observed since the 1900s
# Due to the calendar changes in 1941 (B.E. 2484) and that
# our array only goes up to B.E. 2700; We'll thus only populate
# the data for 1941-2157 (B.E. 2484-2700).
# Thailand's Public Holiday Act wasn't codified until 1914 (B.E. 2457)
# and that our array only goes up to B.E. 2700; We'll thus only populate
# the data for 1914-2157 (B.E. 2457-2700).
# Sources: หนังสือเวียนกรมการปกครอง กระทรวงมหาดไทย มท 0310.1/ว4 5 ก.พ. 2539
START_DATE = date(1940, 11, 30)
START_YEAR = 1941
START_DATE = date(1913, 11, 28)
START_YEAR = 1914
END_YEAR = 2157

def __init__(self, calendar=THAI_CALENDAR) -> None:
Expand Down Expand Up @@ -270,7 +286,7 @@ def _get_start_date(self, year: int) -> Optional[date]:
Calculate the start date of that particular Thai Lunar Calendar Year.
This usually falls in November or December of the previous Gregorian
year in question. Should the year be outside of working scope
(1941-2157: B.E 2484-2700), this will returns None instead.
(1914-2157: B.E 2457-2700), this will returns None instead.

:param year:
The Gregorian year.
Expand Down
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