I want to retrieve TR.EPSExclExtraBasic field , but along with it I need the point in time date (when this data was released) and the reference period.
You can use TR.EPSExclExtraBasic.calcdate and TR.EPSExclExtraBasic.fperiod, e.g.
ek.get_data('IBM.N',['TR.EPSExclExtraBasic', 'TR.EPSExclExtraBasic.calcdate', 'TR.EPSExclExtraBasic.fperiod'])
You can find these options under Output drop-down when you select the field and click on Parameters tab in Data Item Browser app in Eikon and in Formula Builder wizard in Excel.