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<?xml version="1.0" encoding="UTF-8"?>
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<helpdocument version="1.0">
<meta>
<topic id="textscalc01func_isoweeknumxml" indexer="include" status="PUBLISH">
<title id="tit" xml-lang="en-US">ISOWEEKNUM</title>
<filename>/text/scalc/01/func_isoweeknum.xhp</filename>
</topic>
</meta>
<body>
<bookmark xml-lang="en-US" branch="index" id="bm_id3159161"><bookmark_value>ISOWEEKNUM function</bookmark_value>
</bookmark>
<bookmark xml-lang="en-US" branch="hid/SC_HID_FUNC_ISOWEEKNUM" id="bm_id3158403" localize="false"/><h2 id="hd_id3159161"><variable id="isoweeknum"><link href="text/scalc/01/func_isoweeknum.xhp">ISOWEEKNUM</link>
</variable></h2>
<paragraph role="paragraph" id="par_id3149770" xml-lang="en-US"><ahelp hid="HID_FUNC_ISOWEEKNUM">ISOWEEKNUM calculates the week number of the year for the internal date value.</ahelp></paragraph>
<note id="par_idN105E4">The International Standard ISO 8601 has decreed that Monday shall be the first day of the week. A week that lies partly in one year and partly in another is assigned a number in the year in which most of its days lie. That means that week number 1 of any year is the week that contains the January 4th.</note>
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<paragraph role="code" id="par_id3147236" xml-lang="en-US">ISOWEEKNUM(Number)</paragraph>
<paragraph role="paragraph" id="par_id3147511" xml-lang="en-US">
<emph>Number</emph> is the internal date number.</paragraph>
<embed href="text/scalc/01/04060102.xhp#datenumberinfo"/>
<embed href="text/scalc/01/04060102.xhp#datenumberwarn"/>
<embed href="text/scalc/01/common_func.xhp#sectionexample"/>
<paragraph role="paragraph" id="par_id3149792" xml-lang="en-US"><item type="input">=ISOWEEKNUM(DATE(1995;1;1))</item> returns 52. Week 1 starts on Monday, 1995-01-02.</paragraph>
<paragraph role="paragraph" id="par_id3149794" xml-lang="en-US"><item type="input">=ISOWEEKNUM(DATE(1999;1;1))</item> returns 53. Week 1 starts on Monday, 1999-01-04.</paragraph>
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<embed href="text/scalc/01/04060102.xhp#datetimefunctions"/>
</section>
</body>
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