QB Issue Resolution:

Qb POS draws it’s info from the system date. If the computer is not rebooted, you can end up with a date lag.

Reboot the system Every morning, ( a good idea anyways as it clears up system resources so the programs run smoother).

I would also check the time/date settings on the computer to make sure it has not been set to an incorrect time zone.

Resolution for Issue 'why does my new pos 12.0 always change the date to the day before every morning for at least half the day?' available: Yes (Solved).
Source: Intuit Community forum.

why does my new pos 12.0 always change the date to the day before every morning for at least half the day?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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