code: def from_clock_time(cls, clock_time, epoch):
          
          try:
              clock_time = ClockTime(*clock_time)
          except (TypeError, ValueError):
              raise ValueError("Clock time must be a 2-tuple of (s, ns)")
          else:
              ordinal = clock_time.seconds // 86400
              return Date.from_ordinal(ordinal + epoch.date().to_ordinal())
docs: Convert from a ClockTime relative to a given epoch.