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30 days 31 December 91 days adoption ancient approval Assn Astronomical begins on Sunday calen calendar reform calendar shift calendrier Canada Canadian century Chairman Chamber of Commerce Chinese civil Committee Congress days and dates Easter Egyptians Elisabeth Achelis endar extra day February four governments Gregorian calendar interest January Journal of Calendar Julian calendar Julius Caesar labor League of Nations leap-year Leapyear Day lunar Marco Mastrofini Monday moon number of days organized perpetual calendar Pope Gregory Pope Gregory XIII present calendar proposed railroad religious revision Roman S M T W T F S S M T W T F S S M T W T F S S M T W T F S S M T W T F S S M T W T F S scientific social stabilized ternational tion United Nations Victoria Day World Calendar Association world holiday Worldsday