Get only the date from timestamp

Hi,

I have a timestamp in my input. so i convert it as follows

date {
match => ["timestamp", "UNIX_MS"]
target => "mydate"
}

And the mydate is 2017-08-22T11:26:22.156Z

I would like to extract only the 2017-08-22 from the the above.
I have tried but did not get a best solution.

Help appreciated

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