high Sierra datetime messages.app

Hi,

I'm going to chat.db to get messages on a application.

Before on Sierra in my SQL SELECT I was using datetime(date, 'unixepoch','localtime') to convert the timestamps.

Now on High Sierra it's not working, I get nothing.

It's seems the timestamps change... more digit like this : 531651854330806016

Does anybody know how to convert now ?

Thank you for your help

Cédric