@mehedi – any thoughts on this? Seems a pretty major issue to be unable to enter employees into an HR system…

I’m having the same issue.
My site date setting is d/m/Y (the preview for this is 13/05/2021)
Site time setting (if impacting) is H:I

WP ERP Date format is dd/mm/yyyy

Every time I try to add an employee, it throws the “Please select a valid employee hire date” error

The ‘add new employee’ date field seems to be using the mm/dd/yyyy format, despite the setting for the plugin being dd/mm/yyyy