The Modern Calendar. In this guide, we’re going to look at how the calendar has developed and how we use it today. Our modern western calendar is almost entirely a roman invention, but it has changed significantly throughout history.
The modern calendar is a simplified annual calendar with 13 months of 28 days over 4 weeks of seven days each. But before julius caesar, the roman leaders would think nothing of changing the calendar so they could collect taxes earlier, keep themselves in office, or—if they felt like it—add a month.
