Show last updated date in Blogger posts

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Although this is not the kind of post for this blog, I decided to write about this because there are opinions saying it is impossible to show updated date in Blogger posts. Blogger offers support only for the date when a post is published. You can, of course, edit the post and change published date, but that is not what most people want.
The method that follows is completely automatic and it will print the last date when you used the post editor on the specific post. It makes use of data stored in blog feed, because, although there is no tag for updated date in Blogger (something similar to published date tag data:post.timestamp), the updated date is stored in your blog feed. I first noticed this when I registered my blog on Tapatalk and noticed that updated posts appeared on top of the list.
Show last updated date in Blogger posts