Is it possible to make time zone settings unable for editing definite fields

[valetto]

We have lots of users from different time zones. When they create/update fields with setting time it changes.
For example, my time zone is Moscow (+3 GMT). I set in the field 4 a.m but it saves as 1 a.m

[tanya]

All datetime fields are saved in database in UTC timezone.
For each user it is shown in user's timezone