If you're on Linux or something similar, you could use the date command to do the thinking for you...
google calendar add "test event today from `date -d "now + 2 minutes" +%H:%M`"
Use "man date" to see what's going on, but basically, the -d switch lets you specify a date other than now (and it speaks some common formats) and the + bit controls the output format. So the stuff between the `` backticks comes out as 12:05 if it's currently 12:03.
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