Google sheet + App Script : Rename every sheet if it meet criteria

Question

Hi I'm using this script to rename every sheet by inserting 'Copy of' in front of the existing sheet name where the text in cell 'B36' = 'SAFETY ANALISIS' and the date from cell 'K3'is older then 30 days. My issue is having to do with the date I can't quite figure how to do it. Cell 'K3' cell are in this format "1-Aug-2021" I think I need to convert the date in 'K3' to a number format. Any help would be greatly appreciated

function getSheet() {
    var sheets = SpreadsheetApp.getActiveSpreadsheet().getSheets();
    var sum = 0;
    for (var i = 0; i < sheets.length ; i++ ) {
        var sheet = sheets[i];
        var date = new Date();
        var ageInDays = 30;
        var threshold = new Date(
                      date.getFullYear(),
                      date.getMonth(),
                      date.getDate() - ageInDays)
                    .getTime();

        var val = sheet.getRange('K3').getValue();
        var val2 = sheet.getRange('B36').getValue();
       
       


        if (val >= threshold && val2 == 'SAFETY ANALYSIS') {
            var sheetName = sheet.getName()
            sheet.setName('Copy Of '+sheetName)  
        }       
    }

  
}

Answer 1

You may want to wrap the value you get from cell K3 in a Date() constructor. That should work with spreadsheet dates as well as text strings that look like dates.

I think you have the comparison in val >= threshold the wrong way around. Try something like this:

function renameOldSafetyAnalysisSheets() {
  const timeLimit = 30 * 24 * 60 * 60 * 1000; // 30 days
  const now = new Date();
  const sheets = SpreadsheetApp.getActive().getSheets();
  sheets.forEach(sheet => {
    if (sheet.getRange('K3').getValue() !== 'SAFETY ANALYSIS') {
      return;
    }
    const date = new Date(sheet.getRange('B36').getValue());
    if (!date.getTime()
      || now.getTime() - date.getTime() < timeLimit) {
      return;
    }
    try {
      sheet.setName('Copy of ' + sheet.getName());
    } catch (error) {
      ;
    }
  });
}

Answer 2

function getSheet() {
  const shts = SpreadsheetApp.getActive().getSheets();
  let d = new Date();
  let ageInDays = 30;
  let threshold = new Date(d.getFullYear(),d.getMonth(),d.getDate() - ageInDays).valueOf();
  shts.forEach(sh => {
    let val = new Date(sh.getRange('K3').getValue()).valueOf();
    let val2 = sh.getRange('B36').getValue();
    if (val <= threshold && val2 == 'SAFETY ANALYSIS') {
      sh.setName('Copy Of ' + sh.getName())
    }
  });
}