code: def timestamp(value, timezone=None):
      
      if isinstance(value, str):
          try:
              value = pd.Timestamp(value, tz=timezone)
          except pd.errors.OutOfBoundsDatetime:
              value = dateutil.parser.parse(value)
      if isinstance(value, numbers.Integral):
          raise TypeError(
              (
                  "Passing an integer to ibis.timestamp is not supported. Use "
                  "ibis.literal({value:d}).to_timestamp() to create a timestamp "
                  "expression from an integer."
              ).format(value=value)
          )
      return literal(value, type=dt.Timestamp(timezone=timezone))
docs: Returns a timestamp literal if value is likely coercible to a timestamp
  
      Parameters
      ----------
      value : timestamp value as string
      timezone: timezone as string
          defaults to None
  
      Returns
      --------
      result : TimestampScalar