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Week numbers provide a convenient way to track the progression of time throughout the year. They are particularly useful for scheduling, planning, and data analysis. The ISO 8601 standard defines a system of week numbers that is widely used around the world. In this article, we will explore the 2025 week numbers in detail.

According to ISO 8601, a week number represents the week of the year. It is a number between 01 and 53. Week 01 is the first week of the year, which always starts on a Monday. Week 52 or 53 is the last week of the year, which ends on a Sunday.

For example, January 1, 2025, is the first day of the year. Therefore, the week number for January 1, 2025, is:

Week numbers can be useful for scheduling holidays. For example, the Christmas holiday in 2025 falls on week 52. This means that the holiday period starts on December 22, 2025, and ends on December 28, 2025.

Week numbers can also be used for payroll purposes. Many companies pay their employees on a weekly basis. The week number can be used to determine the pay period for each employee.

Week numbers provide a convenient and standardized way to track the progression of time throughout the year. They are particularly useful for scheduling, planning, and data analysis. The 2025 week numbers are shown in the table above.


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