Subject to subsection (2) below, for the purposes of this Chapter where any investments are sold or purchased by the appropriate person the date on which they are sold or purchased shall be taken to be the date on which he entered into a contract to sell or purchase them.

If the sale or purchase of any investments by the appropriate person results from the exercise (whether by him or by any other person) of an option, then, for the purposes of this Chapter, the date on which the investments are sold or purchased shall be taken to be the date on which the option was granted.