The present-day calendar, which includes leap years and century year exclusion, was introduced by
A) Karl Marx in 1917.
B) Julius Caesar in 50 B.C.
C) Ptolemy in the second century B.C.
D) Pope Gregory XIII in 1582.

Question

Quizplus · Accepted Answer

The present-day Gregorian calendar, which includes the system of leap years and the exclusion of certain century years as leap years unless divisible by 400, was introduced by Pope Gregory XIII in 1582 to correct for the Julian calendar's inaccuracies.

The Present-Day Calendar, Which Includes Leap Years and Century Year