Show yes or No based on date value

Hi,

Can anyone help if this possible to do.

There are three fields, two date fields name as Start date and end date and one text field.

User will manually fill start and end date

Condition is : 

If end date is less then 365 days from current date then it show as YES on text field

If end date is greater then 365 days from current date then it show as No on text field

For easy understanding this for warranty calculation.

Please help.

Regards

Faisal