"A calendar date is a reference to a particular day represented within a calendar system. The calendar date allows the specific day to be identified. The ...
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number of days between two dates may be calculated. For example, "24 September 2020" is ten days after "14 September 2020" in the Gregorian calendar. The date of a particular event depends on the observed time zone. For example, the air attack on Pearl Harbor that began at 7:48 a.m. Hawaiian time on 7 December 1941 took place at 3:18 a.m. Japan Standard Time, 8 December in Japan.
A particular day may be represented by a different date in another calendar as in the Gregorian calendar and the Julian calendar, which have been used simultaneously in different places. In most calendar systems, the date consists of three parts: the day of the month, the month, and the year. There may also be additional parts, such as the day of the week. Years are usually counted from a particular starting point, usually called the epoch, with era referring to the particular period of time (note the different use of the terms in geology)." - (en.wikipedia.org 28.09.2020)
