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# holidays
# --------
# A fast, efficient Python library for generating country, province and state
# specific sets of holidays on the fly. It aims to make determining whether a
# specific date is a holiday as fast and flexible as possible.
#
# Authors: Vacanza Team and individual contributors (see CONTRIBUTORS file)
# dr-prodigy <dr.prodigy.github@gmail.com> (c) 2017-2023
# ryanss <ryanssdev@icloud.com> (c) 2014-2017
# Website: https://github.com/vacanza/holidays
# License: MIT (see LICENSE file)
JULIAN_CALENDAR = "JULIAN_CALENDAR"
def julian_calendar_drift(year: int) -> int:
"""Return the Julian–Gregorian date drift relative to the 1899–2099 baseline.
Args:
year:
Gregorian year to check.
Returns:
Number of days to add/subtract relative to the 1899–2099 baseline.
"""
return -13 if year <= 1582 else (year // 100) - (year // 400) - 15
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