Time Settings for Data

[Jason Snyder]

I have a data set with time signatures so that at time 1 (when I enter set t
1) for example the date is January 1 2009 3:00z.  There is another data set
that I want to use with this data set with time signatures so that at time
1,(when I enter set t 1)  the date is January 1 2009 0:00 z.  How am I able
to use the two data sets together in calculations when each has time steps
starting on different hours Z (3:00 z versus 0:00 z)?  Or how do I correct
the time on the first data set where each time step begins on 3:00 z?

Thanks,

Jason
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