Log on edit

code.gs

function onEdit(e){
  
  var sheetName = 'Daily Log'
  var activeSheet = e.source.getActiveSheet()
  
  if (activeSheet.getName() == sheetName) {
    var seconds = 1000
    var row1 = 2
    var signCol = 4
    var whenSigned = SpreadsheetApp.newFilterCriteria().setHiddenValues(['TRUE']).build()
    var activeSheet = SpreadsheetApp.getActiveSpreadsheet().getSheetByName(sheetName)
    var colEdited = e.range.getColumn()
    var rowEdited = e.range.getRow().toFixed(0)
    var timeStampCell = activeSheet.getRange( ('E'+rowEdited))
    var returnCell = activeSheet.getRange( ('D'+rowEdited))
    var didSign = (colEdited == signCol)
    
    if(didSign) {
      var isReturned = returnCell.getValue()
      if (!isReturned) { timeStampCell.setValue('')}
      else if (isReturned) {
        var today = Utilities.formatDate(new Date(), Session.getScriptTimeZone(), 'EEE MM/d @h:mm a')
        timeStampCell.setValue(today)
      }
        
      Utilities.sleep(10*seconds)
      activeSheet.getFilter().setColumnFilterCriteria(signCol, whenSigned)
    }
   
  }
}