Date strptime returns invalid date

Question

Here is my IRB session

1.9.2p290 :020 > Date.strptime("31-2-2010", "%d-%m-%Y")
ArgumentError: invalid date

I have given the proper values, yet it is returning ArgumentError. Am I missing something here?

Answer 1

Yes, you are missing something:
There are never 31 days in February, regardless of the year.

You have given it an invalid date.