Get last modified date

We use OJS 3.1.1.4

I try to modify the webFeed plugin to print the last modification date instead of publication date for an article.
I tried with the function getLastModified in row 97 of file plugins/generic/webFeed/templates/rss.tpl

<dc:date>{$article->getLastModified()|date_format:"%Y-%m-%d"}</dc:date>

However that set yesterday to all articles. I don’t know why!?

Is it possible to get the last date of the last modification in the “Editorial History” of a submission, i.e. the following date:

<span id="cell-0-date" class="gridCellContainer">
	<span class="label">
					2019-02-26
			</span>
</span>

I don’t know where it is located in the database, and neither how to access it from there!

Please help!

Best regards, Edvin

Any ideas?
@asmecher ?

Hi @eddoff,

I would suggest checking the last_modified column in the submissions table in your database to see if the data there matches what you expect.

Regards,
Alec Smecher
Public Knowledge Project Team