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The Gregorian October 2019 Editable Calendar is proleptic before 1582 (assumed to exist before 1582). The following equation gives the number of days (actually, dates) that the Gregorian October 2019 Editable Calendar is ahead of the Julian calendar, called the secular difference between the two October 2019 Editable Calendar. A negative difference means the Julian calendar is ahead of the Gregorian October 2019 Editable Calendar. The year used in dates during the Roman Republic and the Roman Empire was the consular year, which began on the day when consuls first entered office—probably 1 May before 222 BC, 15 March from 222 BC and 1 January from 153 BC.
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