korean-holidays

Korean public holidays calculator with automatic lunar calendar conversion

A Python library that automatically calculates Korean public holidays. Includes automatic lunar-to-solar conversion for Seollal (설날), Chuseok (추석), and Buddha's Birthday (부처님오신날), plus substitute holiday rules. No hardcoding — works for any year.

Features

• Automatic lunar conversion — Seollal (설날), Chuseok (추석), and Buddha's Birthday (부처님오신날) calculated automatically each year
• Automatic substitute holidays — Reflects the expanded 2021 substitute holiday rules
• Any year supported — No hardcoding, just call get_holidays(2030)
• Trading day calculation — is_trading_day(), count_trading_days()
• Built-in cache — No recomputation on repeated calls for the same year
• Zero config — No API key required, no network required

Installation

pip install korean-holidays

Quick Start

from datetime import date
from korean_holidays import get_holidays, is_holiday, is_trading_day, count_trading_days

# All public holidays for 2026
holidays = get_holidays(2026)
for d, name in sorted(holidays.items()):
    print(f"{d} {name}")

# Check a specific date
print(is_holiday(date(2026, 2, 17)))      # True (Seollal)
print(is_holiday(date(2026, 5, 25)))      # True (Buddha's Birthday substitute holiday)
print(is_trading_day(date(2026, 4, 6)))   # True (Monday, weekday)

# Number of trading days in a year
days = count_trading_days(date(2026, 1, 1), date(2026, 12, 31))
print(f"Trading days in 2026: {days}")

# Works for 2030 too (not hardcoded)
holidays_2030 = get_holidays(2030)

API Reference

Supported Holidays

Fixed holidays: New Year's Day (신정), Independence Movement Day (삼일절), Labor Day (근로자의날), Children's Day (어린이날), Memorial Day (현충일), Liberation Day (광복절), National Foundation Day (개천절), Hangul Day (한글날), Christmas

Lunar holidays (automatically calculated): Seollal (설날) 3-day holiday, Chuseok (추석) 3-day holiday, Buddha's Birthday (부처님오신날)

Substitute holidays (automatically applied):

• Seollal (설날) / Chuseok (추석): If overlapping with Sunday, the next available weekday after the holiday period
• Children's Day (어린이날): If overlapping with Saturday/Sunday (since 2014)
• Independence Movement Day (삼일절) / Liberation Day (광복절) / National Foundation Day (개천절) / Hangul Day (한글날): If overlapping with Saturday/Sunday (since 2021)
• Buddha's Birthday (부처님오신날): If overlapping with Saturday/Sunday (since 2023)

Disclaimer

Holiday calculations are based on current legislation and may require updates if laws are amended. Ad-hoc public holidays (e.g., election days) are not included.

License

MIT License. See LICENSE.