proleptic Gregorian calendar (Q1985727)
extension of the Gregorian calendar before its introduction
Language:
Current Data About proleptic Gregorian calendar
(P279) (Q7249564)

(P361) (Q12138)

(P910) (Q28929982)

(P1813) "gregorian calendar" (language: en)

other details
description extension of the Gregorian calendar before its introduction

External Links
(P646) /m/0b05m