Shameless plug...
Scroll down that thread to near the end where latest features are listed.
You can feed multiple Cron and date lists into this node. It is 100% flexible. You even get human friendly times like "in 2 hours, 4 minutes and 27 seconds".
It is perfectly possible to create individual and repeating schedules dynamically, via a dashboard.
Hope it helps.
Ps, the built in help has full instructions and the node had built in example flows (import menu)