As per the documentation for available system properties, the property, glide.ui.date_picker.first_day_of_week can specify the first day of the week in the date and date/time picker with Sunday=1 and Monday=2 and so on.

When setting this property to a value like 2, the expected day to start the week is Monday. However, in the due date picker on a PTASK in a VTB is one day ahead i.e. the week there starts with Tuesday for a value of 2.

• Login to any NewYork instance and go to System properties
• Create the property - glide.ui.date_picker.first_day_of_week with type integer and value = 2
• Open any regular form like incident form and add a date or date/time field to the form (if needed) like Expected Start
• Click on the icon to open the date picker - notice the week starts with Monday as expected
• Open Visual task boards and go to any freeform board or create one if required
• Create a new task or open an existing one
• Click on the date picker next to the due date field
  
  Expected behavior - Week should start the same as above with the first day as Monday
  Actual behavior - Week starts with Tuesday. This is the unexpected behavior

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