How do i add two time stamps

Time stamps are in the form of HH:MM:DD:SS,nnnn

Used Time.parse to convert to Time and tried add ts1 + ts2 but it failed
saying no method.

tried t1 + t1.to_i i am getting

irb(main):013:0> p t1 + t2.to_i
RangeError: time + 1164507831.000000 out of Time range
        from (irb):13:in `+'
        from (irb):13

can somebody help me out?

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