NXLOG - csv field need to parse on date format - how to convert 10Nov2016 to YYYY-MM-DD


I'm catching up logs, but when they arrived to my Graylog, they take the actual date and not the old date. 

I saw my logs and they don't have format date. They're csv, and I have this field :


and I need to assign it on the timestamp, but I don't kno how.

Could you help me please to convert this on a good format?

I tried this (I have a field called: FW_date_time on my source csv file):

AskedNovember 24, 2016 - 5:22pm