Calendar Julian Vs Gregorian. Today, the gregorian calendar is the most widely used calendar in the world, and it is the official calendar of the catholic church. In 1750 following an act of parliament, england and colonies changed to the gregorian calendar, as by then the difference between the calendars had increased to 11 days.

The current discrepancy between the julian and gregorian calendars is 13 days. The julian and gregorian calendars stand as two pivotal timekeeping systems that have significantly influenced the way we measure and organize time.