Question: When was the computer user group which created the country code top-level domain for Denmark founded?

Context paragraphs:
Country code top-level domain: A country code top-level domain (ccTLD) is an Internet top-level domain generally used or reserved for a country, sovereign state, or dependent territory identified with a country code.

Domain name registrar: A domain name registrar is an organization or commercial entity that manages the reservation of internet domain names.  A domain name registrar must be accredited by a generic top-level domain (gTLD) registry and/or a country code top-level domain (ccTLD) registry.  The management is done in accordance with the guidelines of the designated domain name registries.

.ie: . ie is the country code top-level domain (ccTLD) which corresponds with the ISO 3166-1 alpha-2 code for the Republic of Ireland.  The Internet Assigned Numbers Authority (IANA) list the Computing Services Computer Centre of University College Dublin as its sponsoring organisation for the . ie domain.  Since 2000 the business of administrating the domain registry has been handled by IE Domain Registry Limited.  Domain name registration is open to individuals located in, or with a significant connection with, any part of the island of Ireland.  In 2006, . irish was a proposed new generic top-level domain (gTLD) for the global Irish community.

.рф: The domain name . рф (romanized as . rf; abbreviation of Russian: Росси́йская Федера́ция , "Rossijskaja Federacija") is the Cyrillic country code top-level domain for the Russian Federation, in the Domain Name System of the Internet.  In the Domain Name System it has the ASCII DNS name xn--p1ai .  The domain accepts only Cyrillic subdomain applications, and is the first Cyrillic implementation of the Internationalizing Domain Names in Applications (IDNA) system.  The domain became operational on 13 May 2010.  As of 2014 it is the most used internationalized country code top-level domain, with around 900,000 domain names.

.dd: . dd was the assigned country code top-level domain (ccTLD) for the German Democratic Republic (East Germany).  It was chosen based on the ISO 3166-1 alpha-2 code for the German Democratic Republic, the letters coming from the German name of the country: "Deutsche Demokratische Republik ".  In accordance with IANA policy, . dd was therefore available to be assigned as the country code top-level domain (ccTLD) for East Germany.  However, this was never done, and so . dd was never added to the root nameservers. Its only use was internally at the universities of Jena and Dresden.

Country code second-level domain: A country code second-level domain is a second-level domain to a country code top-level domain.  Such a domain may be reserved by the domain name registry for the registration of third-level domains or assigned to a third party as a subdomain.

.hk: . hk is the designated Internet country code top-level domain (ccTLD) for Hong Kong.  Although Hong Kong is part of the People's Republic of China, the transitional "One Country, Two Systems" policy allows Hong Kong to retain a separate top-level domain distinct from the mainland . cn.  Hong Kong Internet Registration Corporation (HKIRC) is the only organization endorsed by the Hong Kong Government to undertake the administration of 'hk' domain names.  Hong Kong Internet Registration Corporation (HKIRC) is a non-profit making, non-statutory, member-based corporation established in 2001.

.dk: . dk is the country code top-level domain (ccTLD) for Denmark.  The supervision of the . dk top-level domain is handled exclusively by DK Hostmaster.  Any new . dk domain name has to be applied for via an approved registrator.  Then the domain name applicant can ask the registrator to manage his domain name or have it managed directly by the DK Hostmaster.  Registrations of domain names with the characters æ, ø, å, ö, ä, ü, and é are also allowed.

Danish UNIX User Group: The Danish UNIX systems User Group (Danish: "Dansk UNIX-system Bruger Gruppe" , DKUUG) is a computer user group around UNIX, which was the first Internet provider in Denmark and which created and maintained the . dk internet domain for Denmark.  Founded 18th November 1983, DKUUG is a primary advisor on the Danish UNIX and Open Standards use.  The group is active in the standards processes for UNIX, POSIX, the Internet, the World Wide Web, and Open Document Format.

Internationalized country code top-level domain: An internationalized country code top-level domain is a top-level domain (TLD) in the Domain Name System (DNS) of the Internet.  IDN ccTLDs are specially encoded domain names that are displayed in an end user application, such as a web browser, in their language-native script or alphabet, such as the Arabic alphabet, or a non-alphabetic writing system, such as Chinese characters. IDN ccTLDs are an application of the internationalized domain name system to top-level Internet domains assigned to countries, or independent geographic regions.

Supporting paragraphs: Danish UNIX User Group .dk
Answer: 18th November 1983