Thank you Lee for the help
If you use the string date (useful is you want move thread on date expiration, the first post I added here):
Text Mask Filter: Custom (regex)
and ^((?:19|20)\d\d)/(0?[1-9]|1[012])/(0?[1-9]|[12]\d|3[01])$
Input Formatter: <?=strtotime({VALUE})?>
Use Custom Input HTML yes and in
Input Field HTML:
Display Format: <?=date('d-m-Y', {VALUE})?>
When you add date in newthread and edit date in editpost still you'll have US format date (yy/mm/dd) but patience.. "he who grasps at too much loses everything"