Date/time automatically +7 hours

hi everyone, why does my log date when I upload it to machine learning automatically add 7 hours.

for example

in the original log:

field: logontime: 14.57

after i upload to machine and import from there it becomes,

field: logontime 21.57

If the field is of type date then the time is stored as UTC timezone, but possibly displayed by Kibana in your local timezone. Is your local timezone UTC+7?

yes. so how i used as UTC timezone?

Kibana - Advanced Settings