So, there seems to be no response from the developer. What the heck? I have this plugin on multiple sites and it would be a nightmare to switch to something else and retrain all my clients!
Are you trying to resolve this or are we just S.O.L.? If you want an exact description of what is happening, you can select the start date an time fine but when you try to set the end date and time, all that you can select from is December in the month and 2020 – 2025 for the year. If you don’t put in an end date, it kinda works – you can enter the start info but, it moves to the end info field when you save it but seems to show correctly on the front-end.
If this does not make sense, I’d be happy to give you the login to the site I’m working on so you can see for yourself. I’ve disabled every plugin and changed to 2015 theme and it did not resolve.