Close Help Center ONLYOFFICE Docs Spreadsheet Editor User guides ONLYOFFICE Workspace ONLYOFFICE Groups ONLYOFFICE Docs Mail Server Talk Module ONLYOFFICE Groups Documents Module People Module Commmunity Module CRM Module Projects Module Mail Module Calendar Module ONLYOFFICE Docs All Editors Document Editor Program interface Introducing the Document Editor user interface File tab Home tab Insert tab Draw tab Layout tab References tab Forms tab Collaboration tab Protection tab View tab Plugins tab Basic operations Create a new document or open an existing one Copy/paste text passages, undo/redo your actions Change color scheme Page formatting Set page parameters Show/hide nonprinting characters Insert section breaks Insert headers and footers Insert date and time Insert page numbers Insert line numbers Insert footnotes Insert endnotes Convert endnotes and footnotes Add bookmarks Add watermark Add hyphenation Paragraph formatting Align your text in a paragraph Set up paragraph outline level Select background color for a paragraph Change paragraph indents Set paragraph line spacing Insert page breaks Add borders Set tab stops Create lists Create hanging indents Text formatting Apply formatting presets Set font type, size, and color Apply font decoration styles Copy/clear text formatting Add hyperlinks Insert cross-references Insert a drop cap Operations on objects Insert tables Use formulas in tables Insert images Insert autoshapes Insert charts Insert text objects Insert field codes Insert SmartArt objects Insert text from file Draw freehand on a document Add caption Insert symbols Align and arrange objects on a page Change text wrapping Insert content controls Create a table of contents Add and format a table of figures Insert videos Fillable forms Create fillable forms Mail Merge Use Mail Merge Math equations Insert equations Collaboration Sharing files and folders Co-editing documents in real time Communicating in real time Commenting documents Tracking changes Comparing and combining documents Version history Plugins Plugin manager Edit an image Create and insert diagrams Edit HTML Correct typography Count words Include a video Insert highlighted code Insert references Translate text Extract text from an image Read the text out loud Type via voice Replace a word by a synonym Upload a document to Wordpress Communicate while editing Make Audio and Video Calls Use AI to write text Insert definitions Add pictures Tools and settings View document information Save, download, print your document Advanced settings of Document Editor View settings and navigation tools ONLYOFFICE Document Viewer Search and replace function Spell-checking AutoCorrect features Protecting documents with a password Helpful hints About Document Editor Supported formats of electronic documents Keyboard shortcuts Spreadsheet Editor Program interface Introducing the Spreadsheet Editor user interface File tab Home tab Insert tab Draw tab Layout tab Formula tab Data tab Pivot Table tab Collaboration tab Protection tab View tab Plugins tab Basic operations Create a new spreadsheet or open an existing one Cut/copy/paste data Undo/redo your actions Add external links to cells Operations with sheets Manage sheets Insert headers and footers Insert breaks Cell text formatting Set font type, size, style, and colors Add hyperlinks Clear text, format in a cell Editing cell properties Add borders Align data in cells Merge cells Change number format Editing rows/columns Add cells Insert or delete cells, rows, and columns Freeze rows and columns Split cells Sort and filter data Use formatted tables Create and edit pivot tables Create slicers for tables Group data Remove duplicates Conditional formatting Data validation Work with functions Insert functions Insert array formulas Use named ranges Watch window Goal Seek Calculate percentages Insert time Switch between languages in a table Operations on objects Insert images Insert charts Insert sparklines Insert and format autoshapes Insert text objects Wrap text Insert SmartArt objects Draw freehand on a spreadsheet Insert symbols and characters Manipulate objects Math equations Insert equations Collaboration Sharing files and folders Co-editing spreadsheets in real time Managing sheet view presets Communicating in real time Commenting spreadsheets Version history Protecting a spreadsheet Protecting a spreadsheet Protecting ranges Protecting your spreadsheets with a password Protecting a sheet Protecting a workbook Plugins Plugin manager Edit an image Include a video Insert highlighted code Translate text Replace a word by a synonym Communicate while editing Use AI to write text Add pictures Tools and settings View file information Save/print/download your spreadsheet Scale a worksheet Advanced settings of Spreadsheet Editor View settings and navigation tools Search and replace functions Spell-checking AutoCorrect features Get data from TXT/CSV file Helpful hints About Spreadsheet Editor Supported formats of spreadsheets Keyboard shortcuts Presentation Editor Program interface Introducing the Presentation Editor user interface File tab Home tab Insert tab Draw tab Transitions tab Animation tab Collaboration tab View tab Plugins tab Basic operations Create a new presentation or open an existing one Copy/paste data, undo/redo your actions Change color scheme Working with slides Manage slides Use Slide Master Set slide parameters Apply transitions Insert headers and footers, notes and handouts Preview your presentation Text formatting Insert and format your text Add hyperlinks Create lists Copy/clear formatting Operations on objects Insert and format autoshapes Insert and adjust images Insert and edit charts Insert and format tables Insert SmartArt objects Draw freehand on a slide Adding animations Creating a motion path animation Insert symbols and characters Fill objects and select colors Manipulate objects on a slide Align and arrange objects on a slide Math equations Insert equations Collaboration Sharing files and folders Co-editing presentations in real time Communicating in real time Commenting presentations Version history Plugins Plugin manager Edit an image Include a video Insert highlighted code Translate text Replace a word by a synonym Communicate while editing Use AI to write text Add pictures Tools and settings View presentation information Save/print/download your presentation Advanced settings of Presentation Editor View settings and navigation tools Search and Replace Function Spell-checking AutoCorrect features Protecting presentations with a password Enable support for video playback in ONLYOFFICE Desktop Editors Helpful hints About Presentation Editor Supported formats of electronic presentations Keyboard shortcuts PDF Editor Program interface Introducing the PDF Editor user interface File tab Home tab Insert tab Comment tab View tab Plugins tab Basic operations Open an existing PDF or create a new document Filling out a form Edit PDF Collaboration Sharing files and folders Communicating in real time Commenting PDFs Draw freehand on a PDF Plugins Edit HTML Count words Find a synonym Translate text Read the text out loud Communicate while editing Tools and settings View PDF information Save/print/download your PDF Advanced settings of PDF Editor View settings and navigation tools Search function Helpful hints About PDF Editor Keyboard shortcuts ONLYOFFICE Mobile Apps ONLYOFFICE Documents for iOS ONLYOFFICE Documents for Android ONLYOFFICE Projects for iOS ONLYOFFICE Web Editors Glossary Video FAQ General Technology Pricing Workspace Enterprise Edition Docs Enterprise Edition Docs Developer Edition ONLYOFFICE Groups Connectors Trial period ISOWEEKNUM Function date and time functions DATE function DATEDIF function DATEVALUE function DAY function DAYS function DAYS360 function EDATE function EOMONTH function More articles HOUR function ISOWEEKNUM function MINUTE function MONTH function NETWORKDAYS function NETWORKDAYS.INTL function NOW function SECOND function TIME function TIMEVALUE function TODAY function WEEKDAY function WEEKNUM function WORKDAY function WORKDAY.INTL function YEAR function YEARFRAC function Calculating the number of days between dates The ISOWEEKNUM function is one of the date and time functions. It used to return number of the ISO week number of the year for a given date. Returns a number between 1 and 54. Syntax ISOWEEKNUM(date) The ISOWEEKNUM function has the following argument: Argument Description date A date you want to find the ISO week number of. Can be a reference to a cell containing a date or a date returned by the DATE function or other date and time function. Notes How to apply the ISOWEEKNUM function. Examples The figure below displays the result returned by the ISOWEEKNUM function. Return to previous page Try now for free Try and make your decision No need to install anythingto see all the features in action