perfect month
month whose number of days is divisible by the number of days in a week and whose first day corresponds to the first day of the week
en-GB/ˈpɜːfɪkt ˈmʌnθ/
en-US/pɚˈfɛkt ˈmʌnθ/
month whose number of days is divisible by the number of days in a week and whose first day corresponds to the first day of the week