I am working on an app in which I need to show the date when google doc was last edited.
Snapshot Here
I am able to get last modified date through Drive api
The best way to go might be to go into the Tools menu and use the "Script editor". A little bit of code makes this not so difficult. Here's one example I found that seems to work.
function onEdit(event) {
var ss = event.source.getActiveSheet();
if (ss.getName() === 'Locations') {
var dd = new Date();
ss.getRange(event.range.rowStart, 8).setValue(dd.toISOString());
}
}
In addition to the code you will need to accept some security dialog question, and you will need to setup a "trigger" for the project. These "triggers" are how you associate the code with an event in the Google Spreadsheet.
Hope this helps.