Can I cancel my rent on the 16th of the month if this is stated in the rental contract?

Questioner

I want to terminate my lease as of the 16th of this month (June), which means that the lease should expire on July 16th of this year. I have informed the landlord of this in writing by e-mail (on time). However, the landlord indicates that the lease ends on August 1st. Who is in the right here? The lease states that 'Art. 20 The notice period for the tenant is one month. The notice must be given by the first or the sixteenth of the month.'

Lawyer

There has been a deviation from the law, that is allowed, you are right.