First, I have many lists, all with date fields, I share my lists with other users, but two users when they open a list item, the date automatically goes back 1 day. Only with click and open the date go back 1 day without edit anything.
We have the same locale, the same time zone, the same language.
this problem occurs only with those 2 users.
This problem does not happen to other users and to me
I have seen this happen to one of my users. If this is happenin in sharedpoint and the settings have not been modified through this resource. I would recommend you start from the root and just check the settings. If you are using AD and ADD, remember that, changes made dont trce back. So make sure to start at AD and then start checking the settings. Hope this helps.