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<?xml version="1.0" encoding="UTF-8"?>
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<helpdocument version="1.0">
<meta>
<topic id="textscalc01func_weeknumxml" indexer="include" status="PUBLISH">
<title id="tit" xml-lang="en-US">WEEKNUM</title>
<filename>/text/scalc/01/func_weeknum.xhp</filename>
</topic>
</meta>
<body>
<bookmark xml-lang="en-US" branch="index" id="bm_id3159161"><bookmark_value>WEEKNUM function</bookmark_value>
</bookmark>
<bookmark xml-lang="en-US" branch="hid/SC_HID_FUNC_KALENDERWOCHE" id="bm_id3158403" localize="false"/><paragraph role="heading" id="hd_id3159161" xml-lang="en-US" level="2" l10n="U" oldref="54"><variable id="weeknum"><link href="text/scalc/01/func_weeknum.xhp">WEEKNUM</link>
</variable></paragraph>
<paragraph role="paragraph" id="par_id3149770" xml-lang="en-US" l10n="CHG" oldref="55"><ahelp hid="HID_FUNC_KALENDERWOCHE">WEEKNUM calculates the week number of the year for the internal date value as defined in ODF OpenFormula and compatible with other spreadsheet applications.</ahelp></paragraph>
<paragraph role="paragraph" id="par_id3147220" xml-lang="en-US" l10n="NEW">Supported are two week numbering systems:</paragraph>
<paragraph role="paragraph" id="par_id3147221" xml-lang="en-US" l10n="NEW">System 1: The week containing January 1 is the first week of the year, and is numbered week 1.</paragraph>
<paragraph role="paragraph" id="par_id3147222" xml-lang="en-US" l10n="NEW">System 2: The week containing the first Thursday of the year is the first week of the year, and is numbered week 1. That means that week number 1 of any year is the week that contains January 4th. ISO 8601 defines this system and that the week starts on Monday.</paragraph>
<paragraph role="heading" id="hd_id3153055" xml-lang="en-US" level="3" l10n="U" oldref="56">Syntax</paragraph>
<paragraph role="code" id="par_id3147236" xml-lang="en-US" l10n="CHG" oldref="57">WEEKNUM(Number [; Mode])</paragraph>
<paragraph role="paragraph" id="par_id3147511" xml-lang="en-US" l10n="U" oldref="58">
<emph>Number</emph> is the internal date number.</paragraph>
<paragraph role="paragraph" id="par_id3154269" xml-lang="en-US" l10n="U" oldref="59">
<emph>Mode</emph> sets the start of the week and the week numbering system. This parameter is optional, if omitted the default value is 1.</paragraph>
<paragraph role="paragraph" id="par_id3148930" xml-lang="en-US" l10n="NEW" oldref="60">1 = Sunday, system 1</paragraph>
<paragraph role="paragraph" id="par_id3154280" xml-lang="en-US" l10n="NEW" oldref="61">2 = Monday, system 1</paragraph>
<paragraph role="paragraph" id="par_id3154281" xml-lang="en-US" l10n="NEW" oldref="71">11 = Monday, system 1</paragraph>
<paragraph role="paragraph" id="par_id3154282" xml-lang="en-US" l10n="NEW" oldref="72">12 = Tuesday, system 1</paragraph>
<paragraph role="paragraph" id="par_id3154283" xml-lang="en-US" l10n="NEW" oldref="73">13 = Wednesday, system 1</paragraph>
<paragraph role="paragraph" id="par_id3154284" xml-lang="en-US" l10n="NEW" oldref="74">14 = Thursday, system 1</paragraph>
<paragraph role="paragraph" id="par_id3154285" xml-lang="en-US" l10n="NEW" oldref="75">15 = Friday, system 1</paragraph>
<paragraph role="paragraph" id="par_id3154286" xml-lang="en-US" l10n="NEW" oldref="76">16 = Saturday, system 1</paragraph>
<paragraph role="paragraph" id="par_id3154287" xml-lang="en-US" l10n="NEW" oldref="77">17 = Sunday, system 1</paragraph>
<paragraph role="paragraph" id="par_id3154288" xml-lang="en-US" l10n="NEW" oldref="81">21 = Monday, system 2 (ISO 8601)</paragraph>
<paragraph role="paragraph" id="par_id3154289" xml-lang="en-US" l10n="NEW" oldref="110">150 = Monday, system 2 (ISO 8601, for interoperability with Gnumeric)</paragraph>
<paragraph role="heading" id="hd_id3146948" xml-lang="en-US" level="3" l10n="U" oldref="62">Examples</paragraph>
<paragraph role="paragraph" id="par_id3150704" xml-lang="en-US" l10n="CHG" oldref="65">=WEEKNUM(DATE(1995;1;1);1) returns 1</paragraph>
<paragraph role="paragraph" id="par_id3149792" xml-lang="en-US" l10n="CHG" oldref="64">=WEEKNUM(DATE(1995;1;1);2) returns 52. If the week starts on Monday, Sunday belongs to the last week of the previous year.</paragraph>
<paragraph role="paragraph" id="par_id3149793" xml-lang="en-US" l10n="NEW" oldref="66">=WEEKNUM(DATE(1995;1;1);21) returns 52. Week 1 starts on Monday, 1995-01-02.</paragraph>
<paragraph role="paragraph" id="par_id3149794" xml-lang="en-US" l10n="NEW" oldref="67">=WEEKNUM(DATE(1999;1;1);21) returns 53. Week 1 starts on Monday, 1999-01-04.</paragraph>
</body>
</helpdocument>
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