Excel - 9 digit zip codes trimmed to first 5 digits

This code will trap for zip codes that have a "-" in it as a separator then trim 5 characters off the end to reveal only 5 digits.

=IF(LEN(P2)=5,P2,LEFT(P2,LEN(P2)-5))

Example: 46033-9695

after code execution "46033" will be displayed.