@Bernard - Your recipe for the date torte is almost identical in concept to the no-bake torte that my Mom used make, the one that got me back to her notebook to look for the recipe.
My Mom's torte (Šaldytas tortas - Frozen torte) uses arrowroot biscuits for the cake "layers", like your Mom's recipe uses graham crackers. The filling consists of a sort-of butter cream frosting that has chopped dried apricots, prunes, and finely chopped almonds. After it's assembled, the torte goes in the freezer for a day or two, and the arrowroot biscuits soften up and kind of meld with the frosting.
They've stopped making Nabisco arrowroot biscuits, but I think the Gerber version will work fine even though they're a bit thicker than the Nabiscos were. We have a number of stores that carry Eastern European products (Polish, Lithuanian, etc) and there may be a cookie available at one of those that might also work.
I'll post the recipe after I translate it from Lithuanian and find some suitable biscuits. And I'll definitely be trying out your recipe, as I'm a huge fan of dates!