Players sometimes change time zone because they can only play at night and do not want their island to be dark. That is a different reason from trying to get extra shop stock, but it is still a clock-related change.
There is also a player route that claims to refresh morning market and clothing stock without the usual clock penalty. The steps are: shop in your current time zone first, save and exit, disconnect from the internet, turn off automatic time sync, then change only the time zone, not the date or region.
After that, choose a time zone where the local time has already passed the daily reset, usually discussed as around 5:00. Enter the game, check the food shop, clothing shop, and morning market, buy what you want, then save and exit again before changing zones.
The important detail in that route is not "set the date forward." It is moving through time zones while keeping the new login time later than your last save time. One player example was saving around 14:00, then only entering a time zone where local time was still after 14:00. If you continue rolling through time zones, the next zone still needs to be past reset and should not put you earlier than the save you just made.
Keep in mind this is a community method, not an official promise. Some players say it works cleanly; others still report warnings or a one-day refresh delay, especially after repeated changes.