What I want to do is that, whenever someone picks a time range where time_tok.latest is "now", I will force it back to @d (because our index won't contain today data). However, for time input, I don't know how to compare the latest part of the value. The above code doesn't work.
It seems you cannot overwrite timetok.latest. If I try that, there is no change, I have to calculate the end time of the search into another field eg "latest", and use that field in the xml instead of "timetok.latest".
I tried to abstract from only limiting to @d when latest=now, because it could also be that a user searches up to -1h@h or something. So I came up with some logic, but my problem with this is, that using eval within the dashboard seems to use my local time, instead of the server time. Since I am in UTC+2 and our server is on UTC, I end up not searching until 00:00 today, but 22:00 yesterday. But maybe this will help you to get a solution: