Working with multiple Timestamps...

I have three Timestamp columns in a DB and need to manipulate them with math operations.
T2-T1 difference beetween two times
T2+T3 sum of two times
My answer is: what is the best method to do this?
Any help will be appreciated.
:)

I have tried to use the long value give by getTime()
function, but it seems to me that after i do the operations an convert the results to Timestamp again, I lost the original value.

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