add 3 hours to each Downloader line?

[iamken <iamken@xxxxxxxxxxxxxxx>]

I have a intraday security in the Downloader and I want to add 3 hours
to each line.  For instance a line currently reads 06:31:00 and the next
line is 06:32:00.  I want it to read 09:31:00 and the next line to read
09:32:00.  There are thousands of lines.  I can't find a way to do this
in either the Downloader or Excel.  Any help is appreciated.  If there
were a trade on each one minute interval (there isn't), I could copy the
times from another file that has the 09:31:00 times and paste them in in
place of the 06:31:00 times.  Any ideas?

Regards,
Ken