Date format 'D-mm-yyyy' causes incorrect day of week on losing focus

[smalos]

• Open the following URL: Vanilla JS Datepicker Demo
• Set the date format to D-mm-yyyy.
• Select any date, for example, Mon-06-2024.
• Press the Tab key or move the focus to another element.
• Observe that the selected date changes to Thu-06-2024.

[smalos]

If updateOnBlur is set to false, there is no issue.