I was so excited by the plugin “Blogger RSS Import” that I failed to notice that it got all the dates wrong on comments (they were all set to midnight of the day I did the import). Thankfully, and very professionally, I got an email from the developer (sent to everyone who commented on the plugin between the applicable dates) that the error existed and had been fixed in the new version. I now have the correct dates on my comments, which is good because all the conversations looked wierd with the comments for each post in random order.