Add The Date Ranges Into My Structure?

I am creating a program that takes into account pay from a job. I will try to describe the problem I am having using some psuedo code - so dont take syntax too seriously.

I created a structure that has some of the following values:
Name as String
Amount as Double
FrequencyType as MyEnumerator

MyEnumerator looks like this:
EveryTwoWeeks = 1
TwiceAMonth = 2
Weekly = 3

Now my problem is how do I add the date ranges into my structure?If your pay is weekly or twice a week, then I just need a single date because all other paydays should increment in 1 or 2 week blocks. But if the pay is twice a month I need two dates. It seems like there has got to be a better way then just having two dates in my structure and knowing that you just need the 2nd date if the FrequencyType is = 2 (TwiceAMonth).I was thinking that instead of a Structure I should use a class and then I could create a function that returns the date or dates depending on the enumeration type that you pass into it.What would be the "correct" way of doing this? I think I need a type of enumerator that allows for more then just integer type values.

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