calculate date

I am working on a case statement, but I am unsure I am getting the logic from correct from the pseudo code. I was wondering if someone can give me a hand and let me know if my case seems to be doing what expected based on the words.

That is:

ContractOpenStartDate = Equal to TODAY if in the middle of contract OR if contract has not started yet OR NULL if Contract is closed

CASE 
  WHEN [sbo_wcnd].[ContractStart] <= @Today AND [sbo_wcnd].[ContractEnd] >= @Today 
    THEN @Today
  WHEN [sbo_wcnd].[ContractStart] > @Today
    THEN [sbo_wcnd].[ContractStart]
  WHEN [sbo_wcnd].[ContractEnd] < @Today
    THEN NULL
END	AS ContractOpenStartDate

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And also...
ContractOpenEndDate = ALWAYS EndDate or NULL if contract is closed.

CASE 
  WHEN [sbo_wcnd].[ContractStart] <= @Today AND [sbo_wcnd].[ContractEnd] >= @Today 
    THEN @Today
  WHEN [sbo_wcnd].[ContractStart] > @Today 
    THEN [sbo_wcnd].[ContractStart]
  WHEN [sbo_wcnd].[ContractEnd] < @Today 
    THEN NULL 
END	AS ContractOpenStartDate

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A contract is closed if its end date is in the past.

Thank you very much for your help.