Unlike the latter, however, the week does not begin with Sunday, but with Saturday. In Arab countries, the system of week numbering is similar to the North American method of calculation just described. However, at the turn of the year, there are usually partial weeks of less than seven days, while the ISO calendar weeks always consist of whole weeks. The rule that the first week always begins on January 1 is more intuitive than in the ISO standard, since the last calendar week always ends with the final week of the year, and the first week always begins with the new year. If December 31 falls on a Tuesday, the last week of the year begins on Sunday, December 29 and consists of three days (Sunday, Monday and Tuesday).If January 1 falls on a Wednesday, the first week of the year begins on that Wednesday and consists of four days (Wednesday, Thursday, Friday and Saturday).The last week of a year always begins on the last Sunday of the year and ends on December 31.The first week of a year always starts on January 1 and ends on the following Saturday.In addition, the first calendar week – regardless of the day of the week – always begins on 1 January. In contrast to the ISO standard, Sunday is the first day of the week, which then ends with Saturday. In the USA, Canada and most Latin American countries, as well as Australia, Japan, Israel, South Korea and other countries, a different system is used for numbering the weeks. North American calculation of week numbers This is because the previous week would have contained only three days of the new year (Friday, Saturday and Sunday).
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