I would like to add my +1 to this topic. The import chat feature is totally useless if it does not import the original conversation to the correct date and time.
𝘙𝘰𝘭𝘢𝘯𝘥 𝘎𝘪𝘦𝘴𝘭𝘦𝘳 ️
It's even more that just that. Older messages are jus tnot imported. The export from Whatsapp has all the messages, but the don't appear in Telegram after the import.
Example: A whatsapp group that has chats from the last 3 or more years only imports the last 2 days to Telegram
I don't think that this is possible since the messages are sorted by their database ID. If they are imported at the correct time this would mean that the ids of all later messages needed to be changed. This could confuse telegram clients. So adding this function would need significant changes to the whole database structure of Telegram or some dirty workarounds. At least that's my assumption. Durov already talked a bit about that on his channel. They plan to add the ability to import up to 100 messages in the correct order. See https://t.me/durov/150