Clojurians Log v2

Hi there, I am trying to generate instance of cljs-time (http://www.andrewmcveigh.com/cljs-time/latest/index.html) but instead getting:

cljs.user> (gen/generate (s/gen #(instance? time/date-time %)))
#object[Error Error: Unable to construct gen at: [] for: function (p1__27926_SHARP_){
return (p1__27926_SHARP_ instanceof cljs_time.core.date_time);
}]
Error: Unable to construct gen at: [] for: function (p1__27926_SHARP_){
return (p1__27926_SHARP_ instanceof cljs_time.core.date_time);
}

I tried gen/generate (s/gen #(time/date? %))) - result the same

Then tried just normal js/Date putting in repl this: (gen/generate (s/gen #(instance? js/Date %))) - similar error

After more googling my guess is that for Dates in general I need custom generator https://stackoverflow.com/questions/55059517/i-have-complex-spec-for-my-data-how-to-generate-samples