see attached Screenshot
The red line indicates where dates are actually from the day before yesterday.

(i) The timezone is set correct:
JIRA: Default user time zone System default: (GMT+01:00) Berlin
USER: Time Zone: JIRA default (GMT+01:00) Berlin
SERVER: Current default time zone: 'Europe/Berlin'
---
Edit: As stated in the comment below:
It seems, that every issue, that is not from today and not older than 48 hours is considered to be from "yesterday"