Q: Are categories from Calendar and To-do different from each other?
A. Yes
Q: Why am I being shown two dates with different time zones?
A: Your current time zone is different than the time zone the event is happening.
One event date is for your current time zone and the other is for the events time zone.
Both are same point in time.
Q: How do I make sure my country does not imposse restrictions on SMS notifications before I purchase a subscription plan?
A: You may try the free version wich allows a number of SMS notifications to see if your country allows SMS or not