If a term date is NOT entered in a rental lease do I HAVE to give 90 day notice to vacate or can I give 30?

Also, the provisions state ';tenant must provide a 90 day written notice in the event that Tenant must vacate premises prior to termination of the lease agreement end date';. BUT there was no ';end date'; provided on the lease agreement each party signed.If a term date is NOT entered in a rental lease do I HAVE to give 90 day notice to vacate or can I give 30?
That means you have a month to month rental agreement. You have to give one month's notice.