Not really. If that park has EMH on a given day, the park hours on the calendar for that day only reflect the regular operating hours. If there is an EMH notation, you have to figure out (by clicking on that link) whether it is a morning EMH or an evening EMH. Typically evening EMH's are three hours while morning EMH's just mean the park opens an hour earlier.
For example, MK's hours on Sunday are 11am-8pm* but it has an evening EMH. This will usually mean that the park will stay open for resort guests until 11pm.
*Example only, not actual hours.
Make sense?