I don't think that there is an IsDate function in SSIS. If you don't mind doing a bit of coding, you could create a script component and do a Regex test on the column - here's a link to a regular expression which validates all dates except for non-leap-year 29 Februarys.
If you haven't even tried to resolve your issue, please don't expect the hard-working volunteers here to waste their time providing links to answers which you could easily have found yourself.