sorea rea blog: calendar january 2011

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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 month, month, and the year. There may also be additional parts, such as the day of 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). The most widely used epoch is a conventional birthdate of Jesus (which was established by Dionysius Exiguus in the sixth century). A date without the year part may also be referred to as a date or calendar date (such as "7 January" rather than "7 January 2011"). As such, it defines the day of an annual event, such as a birthday or Christmas on 25 December. In this format the most significant data item is written before lesser data items i.e. year before month before day. It is consistent with the big endianness of the Indian decimal numbering system, which progresses from the highest to the lowest order magnitude. That is, using this format textual orderings and chronological orderings are identical. This form is standard in Asian countries, Hungary, Sweden and the US armed forces. The many numerical forms can create confusion when used in international correspondence, particularly when abbreviating the year to its final two digits.