lost ten seconds

I am just trying to find the midpoint in a wave that has time in seconds from the beginning of 1904.  

I tell it to print the value:  I get 21:34:46

I tell it to assign it to a global variable and i print it and i get 21:34:46

I assign it to a wave and then put it in a table and I get 21:34:56

        Print secs2time(Mean(wTimeTest),3)
        Variable/G midpoint=median(wTimeTest)
        Print secs2time(midpoint,3)
        Make/O/N=1 NewWave
        NewWave[0]= midpoint
        Edit NewWave

There has to be a simple explanation to this related to the formatting in IGOR or that they are accounting for the change in the size of the universe since 1904. 

Any help would be appreciated.