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Thanks a lot to you and disedorgue and a big sorry for the imprecise description.
what a finally want, was rounding down the decade-minute and it works fine with
sed 's/:\([0-5]\)[1-5]:/:\10:/g' ...

Pardon me, but i'm afraid i didnt understand you right - sorry for the confusion.
i will try to concentrate my specification.
1. a snippet of the original input data [csv] i posted in #1
...

Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted!

1. The problem statement, all variables and given/known data:
my data in...