Can't put a single quote before the year in NSDateFormatter

Question

I want to format my date as follows:

Mon, Apr 14 '09

The dateFormat I'm setting for my NSDateFormatter is EEE, MMM dd 'yy but it shows:

Mon, Apr 14 'yy

If I take out the single quote before the year, I get the last two digits of the year but it's not obvious that it's the year because the single quote is gone. Help?

I've also tried putting ''', '\'', and '\''' before 'yy' but it doesn't work, although the last two produced 'yy and ''09

Answer 1

From http://www.unicode.org/reports/tr35/tr35-31/tr35-dates.html#Date_Format_Patterns:

In patterns, two single quotes represents a literal single quote, …

In your case:

 [formatter setDateFormat:@"EEE, MMM dd ''yy"];