Yahoo Finance API historical quote

Question

I am using PHP and JavaScript to pull data from the yahoo finance API. For some reason the below yahoo finance API url is not pulling any financial data for yesterdays date and resulting in a 404 error. I have checked the API docs to verify the url is correct and it is. It is working for other dates, although not for the date that I need. I am simply trying to get the financial data for 2/16/15. Anyone have any idea why it is failing?

http://ichart.yahoo.com/table.csv?s=ZNGA&a=1&b=16&c=2015&d=1&e=16&f=2015

Thanks in advance

Answer 1

No data! It's President's Day in the US on the 3rd Mon of Feb!