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< title > WEEKNUM Function< / title >
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< h1 > WEEKNUM Function< / h1 >
< p > The < b > WEEKNUM< / b > function is one of the date and time functions. It used to return the number of the week the specified date falls within the year.< / p >
< p > The < b > WEEKNUM< / b > function syntax is:< / p >
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< p style = "text-indent: 150px;" > < b > < em > WEEKNUM(serial_number, [return_type])< / em > < / b > < / p >
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< p > < em > where< / em > < / p >
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< p style = "text-indent: 50px;" > < b > < em > serial_number< / em > < / b > is a number representing the date within the week, entered using the < a href = "Date.htm" onclick = "onhyperlinkclick(this)" > Date< / a > function or other date and time function.< / p >
< p style = "text-indent: 50px;" > < b > < em > return_type< / em > < / b > is a numeric value used to determine on which day the week begins. It can be one of the following:< / p >
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< table style = "width: 40%" >
< tr >
< td > < b > Numeric value< / b > < / td >
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< td > < b > Week begins on< / b > < / td >
< td > < b > System< / b > < / td >
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< / tr >
< tr >
< td > 1 or omitted< / td >
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< td > Sunday< / td >
< td > 1< / td >
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< / tr >
< tr >
< td > 2< / td >
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< td > Monday< / td >
< td > 1< / td >
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< / tr >
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< tr >
< td > 11< / td >
< td > Monday< / td >
< td > 1< / td >
< / tr >
< tr >
< td > 12< / td >
< td > Tuesday< / td >
< td > 1< / td >
< / tr >
< tr >
< td > 13< / td >
< td > Wednesday< / td >
< td > 1< / td >
< / tr >
< tr >
< td > 14< / td >
< td > Thursday< / td >
< td > 1< / td >
< / tr >
< tr >
< td > 15< / td >
< td > Friday< / td >
< td > 1< / td >
< / tr >
< tr >
< td > 16< / td >
< td > Saturday< / td >
< td > 1< / td >
< / tr >
< tr >
< td > 17< / td >
< td > Sunday< / td >
< td > 1< / td >
< / tr >
< tr >
< td > 21< / td >
< td > Monday< / td >
< td > 2< / td >
< / tr >
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< / table >
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< p > When < b > < em > return_type< / em > < / b > is set to 1-17, < b > System 1< / b > is used. This means that the first week in a year is the week that contains January 1.< / p >
< p > When < b > < em > return_type< / em > < / b > is set to 21, < b > System 2< / b > is used. This means that the first week in a year is the week that contains the first Thursday of the year. System 2 is commonly used in Europe according to the ISO 8601 standard.< / p >
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< p > To apply the < b > WEEKNUM< / b > function,< / p >
< ol >
< li > select the cell where you wish to display the result,< / li >
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< li > click the < b > Insert function< / b > < div class = "icon icon-insertfunction" > < / div > icon situated at the top toolbar,
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< br / > or right-click within a selected cell and select the < b > Insert Function< / b > option from the menu,
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< br / > or click the < div class = "icon icon-function" > < / div > icon situated at the formula bar,
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< / li >
< li > select the < b > Date and time< / b > function group from the list,< / li >
< li > click the < b > WEEKNUM< / b > function,< / li >
< li > enter the required arguments separating them by commas,< / li >
< li > press the < b > Enter< / b > button.< / li >
< / ol >
< p > The result will be displayed in the selected cell.< / p >
< p style = "text-indent: 150px;" > < img alt = "WEEKNUM Function" src = "../images/weeknum.png" / > < / p >
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