Week Number Calculator

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Calculates the week number from date.

Week Number
    1.   Date
    7. ,

    1. The first day of week
   
The first week of the ISO calendar system is the week with the year's first Thursday in it. It is mainly used in Europe.
The first week of USA calendar system is the week that contains January 1st.
    Week Number
    [0-0] / 0Disp-Num
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