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What operation do you want? date "subtraction"?
What you are showing us is ONE of the input operands if that is the case.


Jul 18 01:00:00 [minus something] = Jul 17 00:00:00 (probably 25...

Please post your Operating System and version and what Shell you use.
Please post whether you have the GNU date command.


Please post sample input data (already done), a better description of...

get the environment variable TZ from change it.
for ex,
if the TZ is CST6CDT then do it as below.


--> echo $TZ
CST6CDT
--> TZ=CST5CDT
-->date


now it should give you the time reqd .....

cp src_file dest_file 2>/dev/null


--ahamed

redirect stderr ..

cp filea fileb 2>/dev/null

awk 'BEGIN{IGNORECASE=1} /error|warning|exception/' infile
--ahamed

Another work around:
awk 'tolower($0) ~ /error/' inputfile