A Korean Saju (Four Pillars) API that gets the date math right

Short summary

Building a Saju (Korean Four Pillars of Destiny) API requires solving three hard problems: lunisolar calendar conversion with irregular leap months, 24 solar-term boundaries that shift yearly, and true solar-time adjustment for hour pillars. The author's live API (free tier: 100 calls/month) is fully validated against Korea's KASI reference dataset with zero failures across 47,455 test days, letting developers skip calendar math and focus on interpretation. Includes curl and JavaScript examples.

• •Korean Saju requires solving three hidden calendar complexities that trip up naive implementations: lunisolar conversion, solar-term boundaries, and true solar time.
• •The API is live at saju-api.pages.dev with a free tier (100 calls/month) and RapidAPI integration, validated against KASI reference data with zero errors across 47,455 days.
• •Ready to use in minutes with curl or JavaScript examples; includes Five Elements breakdown and compatibility scoring endpoints.

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