This would be a good example of not planning ahead. You coded, before you planned. Two words: "Software engineer" - meaning to engineer the software. A person wouldn't build a building by nailing together a bunch of wood, then two days in start thinking about how they are going to accommodate a door and window. Same in this field.
Enough with the scolding...
Based on your question I'm guessing you did exactly what you said: You added dates as text into a label. Now you are stuck because you don't have any dates to work with, only text. It is possible to convert text back into DateTime (do some reading about TryParse), but it would be better to re-engineer what your application is doing.
Tip 1: Never throw something away until you are sure you are done with it.
Tip 2: Remember to keep your data, and your user interface seperate in your mind.
In this case, as you take in dates from your Calendar control be sure to add them to a List<> or Array of DateType objects just as DeepBlue has indicated. This is the data you will actually use. If you also want to add them to a text box, list control, label or some other UI for your user that's cool too, but the UI is just for the user and not for your program to think with.
Now that you have a list/array of DateTime objects you can work through them for whatever purpose you want. Use a 'for' loop to check each item in the list/array. Is it a Sunday date? Is it after 2 pm? Is it before or after your target date? and so on.
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