A calendar date is a reference to a particular day, represented within a calendar system, enabling a specific day to be unambiguously identified. Simple math can be performed between dates; commonly,
Postal mark of Czechoslovakia dated 13 June 1939
Memorial plaque to John Etty in All Saints' Church, North Street, York, uses dual dating style to record his date of death as "28 of Jan: 170+8/9"
A calendar is a system of organizing days. This is done by giving names to periods of time, typically days, weeks, months and years. A date is the designation of a single and specific day within such
Calendar date
…A calendar date is a reference to a particular day, represented within a calendar system, enabling a specific day to be unambiguously identified. Simple math can be performed between dates; commonly, the number of days between two…
Modern day Indonesian Gregorian calendar of the Jakarta Cathedral
British calendar, 1851, gilt bronze and malachite, height: 20.3 cm, Metropolitan Museum of Art (New York City)
Equinox seen from the astronomic calendar of Pizzo Vento at Fondachelli Fantina, Sicily
Catalan early 20th century perpetual calendar