Beware of document.lastModified!

Today, I was trying to figure out how old a web file was, I used document.lastModified, and I was surprised to see that the date was today, a few seconds ago. That info didn’t seem right, so I reloaded the page. This time, the date was different, now even more recent! I think this was because the file was returned by a server scripting language, which “created” the file a few seconds ago, even though the file was really older. So beware of using document.lastModified; it might be wrong.

Written on March 18, 2018

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server document

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