What is meant by a period of notice of one or more calendar month(s)?

Periods of notice are usually expressed in calendar months. This means a period that runs from the first up to and including the last day of a month. It therefore makes no difference if notice is given at the start, halfway through or at the end of the month, the period of notice will always start after the last day of the month in which notice is given. Example: notice is given on a tenancy agreement on 15 March and a period of notice of one calendar month applies. In this case, the tenancy agreement ends on 30 April.