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=Digits in Numbers=
With endianness, we have to consider how we usually write text (letters of a word, word of a sentence) and numbers (left to right LTR, right to left RTL, top to bottom TTB, bottom to top BTT). Assuming [https://en.wikipedia.org/wiki/Bi-directional_text textflow] is from left-to-right (LTR) and [https://en.wikipedia.org/wiki/Hindu-Arabic_numeral_system Hindu-Arabic numeral system], we write numbers (decimal, as well as binary, octal and hexadecimal) [[Big-Endianendian|big-endian]] wise ("big end first") - that is, we write (or transmit) from most significant to least significant digit from left (first) to right (last).
=Numbers in Dates=
With respect to the significance of the sub-items, we would use big-endian as well, the biggest item left (first), thus yyyy-mm-dd. Anyway, [https://en.wikipedia.org/wiki/Calendar_date Calendar dates] are written quite differently in various countries and cultures, also with various separators.
* [[Little-Endianendian]], dd-mm-yyyy common to the vast majority of the world's countries* Middle-Endian endian mm-dd-yyyy as used in the [https://en.wikipedia.org/wiki/Calendar_date#mm.2Fdd.2Fyy_or_mm.2Fdd.2Fyyyy_.28month.2C_day.2C_year.29 United States] and a few other [https://en.wikipedia.org/wiki/Calendar_date#mm.2Fdd.2Fyy_or_mm.2Fdd.2Fyyyy_.28month.2C_day.2C_year.29 countries], likely more desciptive with name of the month.* [[Big-Endianendian]] yyyy-mm-dd as defined by [https://en.wikipedia.org/wiki/ISO_8601 ISO 8601]
One of the advantages of using the ISO 8601 big-endian standard date format is that when dates in this format are ordered by a standard [https://en.wikipedia.org/wiki/Collation collation] by leading characters first, they are also in date order.
