code: def _utc_year(self):
          
          d = self._utc_float() - 1721059.5
          #d += offset
          C = 365 * 100 + 24
          d -= 365
          d += d // C - d // (4 * C)
          d += 365
          # Y = d / C * 100
          # print(Y)
          K = 365 * 3 + 366
          d -= (d + K*7//8) // K
          # d -= d // 1461.0
          return d / 365.0
docs: Return a fractional UTC year, for convenience when plotting.
  
          An experiment, probably superseded by the ``J`` attribute below.