Method computeYear

src/main/java/com/nlf/calendar/Lunar.java:237–299

计算干支纪年

()

   * 计算干支纪年
   */
  private void computeYear() {
    //以正月初一开始
    int offset = year - 4;
    yearGanIndex = offset % 10;
    yearZhiIndex = offset % 12;

    if (yearGanIndex < 0) {
      yearGanIndex += 10;
    }

    if (yearZhiIndex < 0) {
      yearZhiIndex += 12;
    }

    //以立春作为新一年的开始的干支纪年
    int g = yearGanIndex;
    int z = yearZhiIndex;

    //精确的干支纪年，以立春交接时刻为准
    int gExact = yearGanIndex;
    int zExact = yearZhiIndex;

    int solarYear = solar.getYear();
    String solarYmd = solar.toYmd();
    String solarYmdHms = solar.toYmdHms();

    //获取立春的阳历时刻
    Solar liChun = jieQi.get("立春");
    if (liChun.getYear() != solarYear) {
      liChun = jieQi.get("LI_CHUN");
    }
    String liChunYmd = liChun.toYmd();
    String liChunYmdHms = liChun.toYmdHms();

    //阳历和阴历年份相同代表正月初一及以后
    if (year == solarYear) {
      //立春日期判断
      if (solarYmd.compareTo(liChunYmd) < 0) {
        g--;
        z--;
      }
      //立春交接时刻判断
      if (solarYmdHms.compareTo(liChunYmdHms) < 0) {
        gExact--;
        zExact--;
      }
    } else if (year < solarYear) {
      if (solarYmd.compareTo(liChunYmd) >= 0) {
        g++;
        z++;
      }
      if (solarYmdHms.compareTo(liChunYmdHms) >= 0) {
        gExact++;
        zExact++;
      }
    }

    yearGanIndexByLiChun = (g < 0 ? g + 10 : g) % 10;