DateTime Issues : DD-MON-RRRR

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Hi All,

My requirement is to format the input date and subtract one day from the given date. The requirement sounds simple but the date is not getting formatted.

Input Date : DD-MON-RRRR e.g. 01-JAN-2019

string(xp20:format-dateTime($InputDate,'[DD]-[MM]-[YYYY]') - xsd:dayTimeDuration('P1D')) -  not working

string(xp20:format-dateTime($InputDate,'[DD]-[MN,*-3]-[YYYY]') - xsd:dayTimeDuration('P1D')) -  not working

string(xp20:format-dateTime($InputDate,'[D01]-[MN,*-3]-[Y0001]') - xsd:dayTimeDuration('P1D')) -  not working

Thanks,

Ritu