{
  "date": "2026-10-29",
  "cases": [
    {
      "input": {
        "calendar": "lunar",
        "year": "2023",
        "month": "2",
        "day": "1",
        "time": "12:00",
        "gender": "1",
        "unknown": false,
        "leap": false,
        "zone": "Asia/Hong_Kong",
        "longitude": "114.1694",
        "solar": false,
        "sect": "2",
        "fold": "first",
        "city": "0"
      },
      "gregorian": "2023-02-20",
      "pillars": [
        "Gui Mao",
        "Jia Yin",
        "Ji You",
        "Geng Wu"
      ],
      "roundtrip": {
        "year": 2023,
        "month": 2,
        "day": 1
      },
      "solarEquivalence": true
    },
    {
      "input": {
        "calendar": "lunar",
        "year": "2023",
        "month": "2",
        "day": "1",
        "time": "12:00",
        "gender": "1",
        "unknown": false,
        "leap": true,
        "zone": "Asia/Hong_Kong",
        "longitude": "114.1694",
        "solar": false,
        "sect": "2",
        "fold": "first",
        "city": "0"
      },
      "gregorian": "2023-03-22",
      "pillars": [
        "Gui Mao",
        "Yi Mao",
        "Ji Mao",
        "Geng Wu"
      ],
      "roundtrip": {
        "year": 2023,
        "month": -2,
        "day": 1
      },
      "solarEquivalence": true
    }
  ],
  "invalidCase": {
    "input": {
      "calendar": "lunar",
      "year": "2024",
      "month": "2",
      "day": "1",
      "time": "12:00",
      "gender": "1",
      "unknown": false,
      "leap": true,
      "zone": "Asia/Hong_Kong",
      "longitude": "114.1694",
      "solar": false,
      "sect": "2",
      "fold": "first",
      "city": "0"
    },
    "error": "This lunar date or leap month does not exist. Check the lunar birth record."
  },
  "checks": "Both lunar dates roundtrip; equivalent Gregorian inputs yield identical pillars; nonexistent leap-month rejected"
}