True sort-by-date may not be available for CSEs, but try this:

  customSearchControl.setSearchStartingCallback(
    this,
    function(control, searcher, query) {
      searcher.setQueryAddition(
        'more:recent4');
    });

This uses the "recent4" label to apply a bias for recent results.
AFAIK this may be the closest available *approximation* to sort-by-
date for CSEs.

Note:  For reasons unknown to me, this solution might not work for
some CSEs.

-- omr

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