Date to convert to MM/DD/YYYY

Hi,

I have Character Field contains value = 2015.02.23 (sysdate()).

I want output as 02/23/2015.

I coded as to_date(<field>, 'MM/DD/YYYY')

I have got error as 15 can not be converted to month.

Could you please help me what expression I need to use?.

Regards.