Thank you for replying me as quickly. When i delete the filter i have this result in a file :
{"txechecczhier_date":"2017-04-25 00:00:00 +0200","txechecczhier_tx":2.08,"@version":"1","@timestamp":"2017-04-28T12:51:01.476Z"}
I want to display my txechecczhier_date in kibana, the date is different from the timestamp. With date filter we can transform a string to a timestamp?