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If you are on Solaris 10, the ksh93 (Korn) shell is available to you.

In this shell, date arithmetic is fully supported

$ printf "%(%D)T\n" "Jan 1 2000 + 4444 days"
03/02/12
$

You're running awk 1 million separate times, to process 1 million separate lines. That's as wasteful as making 1 million phone calls to say 1 million words, slow and pointless. It is an external...

This is working fine.. Thanks rdcwayx:)