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If you will not be reading any stream with awk, you can just have the BEGIN block. That way awk won't try to read any input and you can drop the pipe with echo.

I think bash doesn't support floating point arithmetic. ksh93 does.
You may use ksh93 or bc or awk (as bmk suggested).
You may use bmk's solution with a slight modification:
awk 'BEGIN{"date...