KQL from @timestamp until 7days offset

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I did some tests and the behavior is a bit weird.

I have the same result by doing this :

@timestamp >= "now-1d/d+11h" AND @timestamp <= "now-1d/d+13h"

OR this :

@timestamp <= "now-1d/d+13h"

I tried everything but I can't go back any further than today's date at midnight !

Here another link that I found very helpful to understand :

Several date math questions

I found it very easy to understand but in practice I couldn't get it to work beyond today's intervals