Well, how to sort on an array element is a FAQ. But judging from you example, giving you the FAQ answer will just cause you to come with a followup question, as your example only has one array which actually has an end date, and a poorly formatted one as well. Note BTW, that your example isn't valid code. It misses quotes, and arrayref delimiters.

I'd say, either read the FAQ, or format your real question.