Haven’t learned advanced query yet. 
Right now you can create a deadline item by the /deadline command, but it can only be displayed as the absolute time, instead of countdown timers. Shall we move this into a feature request?
I know /deadline. I just got to know Datalog is very powerful and thought it might support calculation like this. If it’s not the case, it’s ok to move this into a feature request.
The data is there. It’s the “rendering the time as countdown (and refreshing every one second)” that’s not there. I see it as a good opportunity for testing the upcoming plugin system.
+1 for a deadline countdown
But as an aside, what does /Deadline actually do?
Check the quick overview of deadline vs scheduled on this post- https://twitter.com/hdanzu/status/1485673955574919168?s=21
I made a very simple plugin Logseq Deadline Countdown, which can be found in the marketplace 
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