Metric calendar

The Metric Calendar, also known as the International Fixed Calendar, is a modified year divided into 13 months of 28 days each, totaling 364 days. This system includes an extra "Year Day" at the end of the year that is outside the months, and in leap years, a "Leap Day" is added, creating symmetry. The goal is to standardize the calendar, making each month consistent in length and simplifying planning and calculations. It aligns weeks uniformly across months, potentially improving productivity and time management, although it is not widely adopted internationally.