Comparing date between current date with Date of birth with Date of joining

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C#

ASP.NET

Hi All,

Im working on project where i need to enter "Date of Birth" and "Date of Joining"(should be more than 21 years) from current date but Date of Birth and Date of Joining should not be same.

Ideally Date of Birth and Date of Joining should have at least 5 years.

this i need to do as 1st option:

Javascript on Date of Birth filling and Date of Joining filling(on focus off)
C# asp.net on click event.

Project is about Registration form for lectures

Thanks