Given a dt, returns the next close.

        Parameters
        ----------
        dt: pd.Timestamp
            The dt for which to get the next close.

        Returns
        -------
        pd.Timestamp
            The UTC timestamp of the next close.

def next_close(self, dt):
        """
        Given a dt, returns the next close.

        Parameters
        ----------
        dt: pd.Timestamp
            The dt for which to get the next close.

        Returns
        -------
        pd.Timestamp
            The UTC timestamp of the next close.
        """
        idx = next_divider_idx(self.market_closes_nanos, dt.value)
        return pd.Timestamp(self.market_closes_nanos[idx], tz=UTC)