All values for this field are currently stored in the UTC time zone format. If you change the behavior of the field, the ...

All values for this field are currently stored in the UTC time zone format. If you change the behavior of the field, the value will no longer be converted to the current user's local time zone. As a result, some date values may change. You should review all the dependencies of this field, such as business rules, workflows, and calculated or rollup fields, to ensure that issues won't occur.