QB Issue Resolution:

Go to Edit > Preferences > Time & Expenses > Company preferences and change the first day of the week.

Resolution for Issue 'How do I change the look of the calendar in the “Pay Peroiod Ends” and in the “Check Date” to start on Monday and finish on Sundays. instead of Sunday to Saturday.' available: Yes (Solved).
Source: Intuit Community forum.

How do I change the look of the calendar in the “Pay Peroiod Ends” and in the “Check Date” to start on Monday and finish on Sundays. instead of Sunday to Saturday.: 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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