Difference between two singlestat values?

In fact I just figured it out, and wow is this obscure!

To show the value for “today so far” you use “override relative time” =
“now/d” and leave “add time shift” blank. So far so good.

To show the value for “yesterday” (midnight to midnight) you use “override
relative time” = “now/d” and set “add time shift” to “1d/d”.

For “the day before yesterday” you use “override relative time” = “now/d” and
set add time shift" to “2d/d”, and so on.

I had tried setting the time shift to “1d”, “2d” etc, but it hadn’t for a
moment occurred to me that the syntax might be “2d/d”. I’ve never seen
anything quite like that in another language, and whereas I’m pretty sure that
Manage dashboards | Grafana documentation is the right place in the
documentation to look for this stuff, it doesn’t say anything about this
syntax.

Incidentally, I got the clue about how to do this from

If anyone who actually knows how this syntax works (I mean, “1w/d” seems to do
something, and so does “1d/w”, but I have no idea what the background meaning
of those might be) could update the documentation to explain it, I think it
might enable a lot more people to use this very useful (in certain situations)
feature.

Antony.