datepicker in sql query

wxPython Users
1

I want to create a query that will extract data between two given dates. Dates are given in datepicker

datepickers:
startDate = str(self.datepicker_ctrl_1.GetValue ())
EndDate = str(self.datepicker_ctrl_2.GetValue ())

query:
SELECT employ.name, employ.surname FROM work JOIN employ ON employ.idZ=work.employ_idZ WHERE work.dateFrom>= ‘??’ AND work.dateToDO<= ‘??’

What can I set in query instead of ‘??’