code: def isconsistent(self):
          '''Check if the timeseries is consistent'''
          for dt1, dt0 in laggeddates(self):
              if dt1 <= dt0:
                  return False
          return Truf isconsistent(self):
          '''Check if the timeseries is consistent'''
          for dt1, dt0 in laggeddates(self):
              if dt1 <= dt0:
                  return False
          return True
docs: Check if the timeseries is consistent