The Icelandic calendar has a year of either 52 or 53 weeks. The year is divided into a summer season beginning in April and a Winter Season beginning in October. At some time the number of weeks in each year was defined so that the Summer Season began on the first Thursday on or after 9 April in the Julian Calendar or 19 April in the Gregorian calendar.
Graph IRI | Count |
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http://dbkwik.webdatacommons.org | 5 |