Sets the start_at of this Shift.
        RFC 3339; shifted to location timezone + offset. Precision up to the minute is respected; seconds are truncated.

        :param start_at: The start_at of this Shift.
        :type: str

def start_at(self, start_at):
        """
        Sets the start_at of this Shift.
        RFC 3339; shifted to location timezone + offset. Precision up to the minute is respected; seconds are truncated.

        :param start_at: The start_at of this Shift.
        :type: str
        """

        if start_at is None:
            raise ValueError("Invalid value for `start_at`, must not be `None`")
        if len(start_at) < 1:
            raise ValueError("Invalid value for `start_at`, length must be greater than or equal to `1`")

        self._start_at = start_at