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December 18 is the 352nd day of the year (353rd in leap years) in the Gregorian calendar; 13 days remain until the end of the year.
The Gregorian calendar is the calendar used in most parts of the world. It went into effect in October 1582 following the papal bull Inter gravissimas issued by Pope Gregory XIII, which introduced it as a modification of, and replacement for, the Julian calendar.
December 17 - Eastern Orthodox liturgical calendar - December 19. All fixed commemorations below celebrated on December 31 by Eastern Orthodox Churches on the Old Calendar. [note 1] For December 18th, Orthodox Churches on the Old Calendar commemorate the Saints listed on December 5 .
Dec. 17: National Maple Syrup Day. Dec. 18: Answer the Telephone Like Buddy the Elf Day, National Twin Day, International Migrants Day. Dec. 19: National Hard Candy Day, National Oatmeal...
The calendar year has begun in January and ended in December since about 450 BC according to Ovid or since about 713 BC according to Macrobius and Plutarch (see Roman calendar). Julius Caesar did not change the beginning of either the consular year or the calendar year.
The General Roman Calendar is the liturgical calendar that indicates the dates of celebrations of saints and mysteries of the Lord (Jesus Christ) in the Roman Rite of the Catholic Church, wherever this liturgical rite is in use. These celebrations are a fixed annual date, or occur on a particular day of the week.