In my iPhone app, I need to display date in yyyy/MM/dd
format as show in beloow image
The UIDatePicker is made to adapt to the user's settings. Changing its format using the locale: method was possible but is now deprecated in iOS 5.0.
You can view your format in the settings of your iPhone :
Settings > General > International > Region Format >
If you want a specific format, consider making your own picker but it is very discouraged for a date picker.
And also refer this Link