Find and Convert UTC Time to PST Time

Hello All -

I have a script that grabs data from the net and outputs the following data

46029  46.144 -124.510 2010 07 26 22 50 320   4.0   6.0  2.2   9  6.8 311 1012.1  -0.9  13.3  13.5  13.3   -     -
46041  47.353 -124.731 2010 07 26 22 50 250   2.0   3.0  1.6   8  6.4  - 1011.6    -  12.5  13.1    -   -     -
46088  48.333 -123.167 2010 07 26 22 50 250   4.0   5.0  0.4   7  4.9 259 1009.2    -  13.4  13.0    -   -     -

The 7th and 8th columns (highlighted in red) represent a UTC/GMT time stamp. how can i convert each row, column $7 and $8 into Pacific Standard Time (-8 GMT) keeping in mine that my server is located in Mountain Standard Time (-7 GMT)?