Question

Is it possible to implement the expiration date checking by script. 

Answer

Please use the ExpirationDate Method of the License Object. This method returns the date in separate parts through references. In the C#, it will look like this:
license.ExpirationDate(out var year, out var month, out var day); // C#

More information you could find in this article from our Help: ExpirationDate Method of the License Object