Agent Skills: cjk-calendar

Convert between Chinese, Japanese, Korean, and Vietnamese lunisolar calendar dates and Gregorian/Julian dates. Use when the user needs to look up historical East Asian dates, convert era names (年號) like 康熙, 天保, 崇禎 to Western dates, compute sexagenary cycle (干支) day/month/year, or work with Julian Day Numbers. Supports ~220 BCE to 1945 CE with 1,637 eras and 131,808 lunar month records. Runs entirely locally with a SQLite database.