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Hello I am trying to set a date into Google Doc's document header. Now, here is the code I got so far but it won't change the current date inside my document's header as I close the document and re-open it any ideas what might be wrong with this code?

function onOpen() {
   var date = Utilities.formatDate(new Date(), "GMT-6", "dd-MM-yyyy"); 
   var pattern = "\\b\\d{2}\\.\\d{2}\\.\\d{4}\\b"; 
   var header = DocumentApp.getActiveDocument().getHeader();
   header.editAsText().replaceText(pattern, date);

Also please note that I do have a date in this format inside my header: 15-10-2020. But this should update to give me today's date. However, that's not happening.


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