Date and time notation around the world varies.

An approach to harmonise the different notations is the ISO 8601 standard.

Since the Internet is a main enabler of communication between people with different date notation backgrounds, and software is used to facilitate the communication, RFC standards and a W3C tips and discussion paper were published.

  "Standard for the Format of Arpa Internet Text Messages"
 published 1982-08-13
 e.g. used for email
 format: [day ,] 20 Jun 82 14:01:17
  "Internet Calendaring and Scheduling Core Object Specification"
 format: 19960401T235959Z
  "Date and Time on the Internet: Timestamps"
 published July 2002
 intended use: new internet protocols
 format: 1982-06-20
 W3C: "Use international date format (ISO)"

See also 
 Date and time representation by country
 
 Date code on a semiconductor package
 Holocene calendar
 ISO 8601 usage
 Time formatting and storage bugs
 Unix time

Date and time representation