Google Apps Script spreadsheet date manipulation - google-apps-script

Question

I have three scripts that are in a google docs spreadsheet. In this spreadsheet, in column H (or column 8), if I type an "x", the script changes it into that days date. After a few days, every date in column H has changed from a date to just a number. The numbers look like this: 40492, 40494, 40511. I am not sure what is causing this. Maybe it's something that is wrong in my script. I've pasted them below. Any ideas?
function onEdit(e) {
var colorA = "yellow";
var colorB = "#dddddd";
var colorC = "#dddddd";
var sheet = SpreadsheetApp.getActiveSpreadsheet().getSheetByName("Purchase Orders");
var range = e.source.getActiveRange();
var sheetName = SpreadsheetApp.getActiveSheet().getName();
if (sheetName == "Purchase Orders") {
// 3 is column C
if (range.getColumn() == 3 && range.getValue() != "") {
sheet.insertRowAfter(range.getRow());
var r = range.getRow() + 1;
sheet.getRange("A" + r + ":H" + r).setBackgroundColor(colorC);
}
}
var col = e.source.getActiveRange().getColumn();
if(col == 3 || col == 8) {
var rows = sheet.getMaxRows();
//column C
var rangeC = sheet.getRange("C1:C"+rows);
var valuesC = rangeC.getValues();
//column H range
var rangeH = sheet.getRange("H1:H"+rows);
var colorH = rangeH.getBackgroundColors();
var valuesH = rangeH.getValues();
//iterate over each row in column C and H
//then change color
for (var row = 0; row < valuesC.length; row++) {
//check for columnC and column H
var hRow = colorH[row];
if (valuesC[row][0] != "" && valuesH[row][0] == "") {
hRow[0] = colorA;
} else if (valuesH[row][0] != "") {
hRow[0] = colorB;
}
}
sheet.getRange("H1:H" + rows).setBackgroundColors(colorH);
}
}
And this one
function onEdit(e) {
var ss = e.source.getActiveSheet();
var r = e.source.getActiveRange();
// 1 is A, 2 is B, ... 8 is H
if (r.getColumn() == 8 && r.getValue() == "x") {
r.setValue(Utilities.formatDate(new Date(), "MST", "yyyy-MM-dd"));
}
}
And this last one
ss = SpreadsheetApp.getActiveSpreadsheet();
function onOpen() {
var ss = SpreadsheetApp.getActiveSpreadsheet();
var menuEntries = [ {name: "New PO", functionName: "NewPO"}];
ss.addMenu("New PO", menuEntries);
}
function NewPO() {
SpreadsheetApp.getActiveSheet().insertRowsBefore(1,6);
// Adjust this range accordingly, these are the cells that will be
// copied. Format is getRange(startRow, startCol, numRows, numCols)
ss.getSheetByName("PO Form").getRange(1, 1, 6, 8)
.copyTo(SpreadsheetApp.getActiveSheet().getRange(1, 1, 6, 8));
}

Answer 1

In OnEdit, you probably want to set the format for that cell as well. setNumberFormat(numberFormat) appears to be the function you are after.
http://code.google.com/googleapps/appsscript/class_range.html#setNumberFormat