Was looking to get the shares outstanding every quarter. Used the following 
ek.get_data('STEL.SI', fields = ['TR.ISPeriodEndDate','TR.CompanySharesOutstanding'] ,
        parameters= {'Frq' : 'FQ', 'SDate' : 0, 'EDate': -12, 
                     'CH' : 'Fd'})
The TR.ISPeriodEndDate was to give the reporting date. Unfortunately, this gives
InstrumentIncome Statement Period End DateCompany Shares 
STEL.SI  2018-03-31. 16329158300.0 
STEL.SI  2018-03-31. 16329158300.0 
STEL.SI  2018-03-31  16329158300.0 
STEL.SI  2018-03-31. 16329158300.0 
STEL.SI  2017-03-31. 16329100000.0 
STEL.SI  2017-03-31. 16329100000.0
rather than the reporting quarter dates.
Pls advise what would be the correct query