Testing as if in another timezone
Having users in other time zones can lead to problems. In particular if dates (for historic reasons) are represented as time stamps - that is, a time of day is included.
In order to do manual tests it is beneficial to be able to run your browser as if it was running in another time zone.
On Edge in Windows (probably you’ll find something like that in other browsers) - you can do it via the Developer Tools (F12) and under the “Sensors” tab there is the option the change your location. You may create extra locations than the pre-defined. Use the TZ Database Time Zones.