[PE Dry Run]W10-3 setDate command parseing invalid input dates as valid.

[nus-se-bot]

When parsing the dates for setDate command for the month of Feb, invalid dates (such as 31st of Feb) still gets parsed as 28th.

Input/Steps to reproduce: select any event, attempt to set the date to 31-02-1900
Expected: Application should throw an invalid date error
Output: Application saves the date as 28-02-1900.

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Reported by: @prokarius
Severity: Low

_{[original: nus-cs2103-AY1819S1/pe-dry-run#659]}