Not exactly sure since when (I would say around the first week of january), but lately skype offline messages received will not report the correct time of the message (when it was sent), but instead it reports the time of WHEN I go online. If I delete the entries and load them from history, I get the server time
Example:
Message sent from my contact to me when I was offline, at 16.22
I go online at 19.00, I receive the message:
19.00 *offline message*
then I delete it from history and I import again: I receive:
16.22 *offline message*
In short, I have to always use the importing command manually with offline messages, otherwise I'll get wrong times
This never happened since Skypeweb plugin started (around 2015 I think)