How do I populate a date depending on what is selected in a drop down?

I'm new to this and have been reading so many discussions and verbiage on this that I am confusing myself more than anything.  This is the current custom calculation script I have:

(function () {

    // Get date from field
    var v = getField("Today").value;

    if (v) {

        // Convert string to date
        var d = util.scand('mm/dd/yyyy', v);

        // Add 14 days
        d.setDate(d.getDate() + 14);
        // Set value of this field to the new date
        event.value = util.printd("mm/dd/yyyy", d);

    } else {

        // Blank field if no date entered
        event.value = "";
    }
})();(function () {

    // Get date from field
    var v = getField("Today").value;

    if (v) {

        // Convert string to date
        var d = util.scand('mm/dd/yyyy', v);

        // Add 180 days
        d.setDate(d.getDate() + 180);
        // Set value of this field to the new date
        event.value = util.printd("mm/dd/yyyy", d);

    } else {

        // Blank field if no date entered
        event.value = "";
    }
})();

The issue I'm having is no matter which option is selected from the drop-down list, it still populates the date as Today + 180 days.