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cat filename | awk -F ":" '{print $1":"$2, substr($3,3)}' >>new.file

cat filename | awk -F ":" '{print $1":"$2 ", substr($3,3)}' >>new.file
will give the required result

In awk set the FS to ":" and then substitute the $3 field.

sed 's/:00//g' <filename>
should help