Date and time notation

{{more citations needed|date=January 2019}}

{{Use American English|date=December 2024}}

Date and time notation around the world varies.

An approach to harmonize 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.

• {{IETF RFC|822|link=no}} "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
• {{IETF RFC|2445|link=no}} "Internet Calendaring and Scheduling Core Object Specification"
• format: 19960401T235959Z
• {{IETF RFC|3339|link=no}} "Date and Time on the Internet: Timestamps"
• published July 2002
• intended use: new internet protocols
• format: 1982-06-20
• W3C: [http://www.w3.org/QA/Tips/iso-date "Use international date format (ISO)"]