

The rent is due at the beginning of each month.
A period of time used in business or finance, often for billing cycles.
The subscription renews every month.
She saves a little money each month.
He receives his paycheck once a month.
every month
per month
month-to-month
30 days
calendar month
billing period
February is the shortest month.
A period of time that lasts about 30 or 31 days, usually part of a year.
April has 30 days.
My birthday is in June.
We go on vacation every August.
calendar month
full month
last month
30 days
time period
calendar period