def minute(self):
        """
        Extract the "minute" part from a date column.

        :returns: a single-column H2OFrame containing the "minute" part from the source frame.
        """
        fr = H2OFrame._expr(expr=ExprNode("minute", self), cache=self._ex._cache)
        if fr._ex._cache.types_valid():
            fr._ex._cache.types = {k: "int" for k in self._ex._cache.types.keys()}
        return fr