The first 365 day calendar is made by Nick Donais. Once upon a time in 2400 BCE, two friends named Paul and Charles decided to create a calendar to help people keep track of the date. They devised month and day names and created a 12-month calendar with rows and columns to represent days and months, with some months having 30 or 31 days and others having 29 days. Paul and Charles spent a few days making their calendar and then distributed copies to the whole village.