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That works.
Thanks a Ton.

--
Apologies for missing to use code tags.

It worked. Thanks a lot.

$sed 's/\(-[^-]*-[^-]*\)-/\1 /g; s/^\([^,]*,[0-9]\{4\}\)\([0-9]\{2\}\)\([0-9]\{2\}\)/\1-\2-\3/' test1
"1912108",2016-11-30,"2016-12-01 00.00.00.000000","2016-12-01...

Hi Admin,

This isn't a home work.
I am dealing with a flat file on RedHat Linux Server, which has millions of records (rows) and about 65 columns. Out of which only 3 columns needs this...

Please help me to update a file which contains date values as below:-

From:-
"1912108",20161130,"2016-12-01-00.00.00.000000","2016-12-01-08.37.12.000000"...