Difference between 'YYYY' and 'yyyy' in NSDateFormatter

Question

What is exact difference between \'YYYY\' and \'yyyy\'. I read in this link, it states that

A common mistake is to use YYYY. yyyy specifies the calen

Answer 1

Also when using a date format string using the correct format is important.

@"YYYY" is week-based calendar year.

@"yyyy" is ordinary calendar year.

You can go through the whole blog, its a good to give it a look

https://web.archive.org/web/20150423093107/http://realmacsoftware.com/blog/working-with-date-and-time

http://realmacsoftware.com/blog/working-with-date-and-time (dead link)