Date field in erpnext

Hi, I wanted to change the date format to MM-yyyy which ERPNext don’t support from the system setting. how can i set this date format in purchase receipt form.

Go to System Settings and select the desired date and time format.

i need only month and year format.not date included.can you plz help me to set month and date only

well then this needs core customization.

can you plz help to setup the code.