Search negative time-period from "now" to dynamic period of time

Platform(s), such as mobile, website, API, other:

API, Mobile, Website, Other

URLs (aka web addresses) of any pages, if relevant:

Description of need:
Dynamic search by time-period backwards from “now”, to create dynamic search-link or heatmap

Feature request details:I would like to create a link that uses a dynamic time-frame from “now” (dynamic now-time or today) on, to a backward period of time, like one day, or week, or month, or year(s).What i did try is some thing like the following link

https://www.inaturalist.org/observations?created_d1=-0000-00-00&created_d2=-0000-00-01

Where I did use the parameter created_d1=-0000-00-00 (minus 0) as the dynamic now-time, and the parameter created_d2=-0000-00-01 (minus one day).

Such an search option could then be used to generate the normal search results such as table view or as i want it, to generate heatmaps.

In a heat map link it then would always show where some activity is hot, but always dynamically just in the last time-period like in example the last 6 month.
Later after may 6 month one could click the same link and it will then show how how cold some activity has become.

I know the histogram view, but this shows me the time period of one or mor years, but not bound to a custom place or a custom time.

Later i would like to use such a dynamic heatmap link in some sort of tracking calendar.
Users can then click the same link every week or month and it will then always show results or a heatmap from the date when they click back to a specified period like one week.

This would be useful in blogs like “See on the heatmap where i was very active in the last 6 month"“.
It also would be interesting where observers want to travel with the amount of observations at a place, like birds which are moving from one region to an other region, where you can always see where they are hot in a given timeframe backwards from “now”.

There is already given the option to search for a time range, but this is not dynamic, as users have to specify an exact start-date and an exact to-date. Such links can not work dynamically.

Also i think to add a “now”-date option would not be extremely dramatic as most programming languages know some sort of “now”-time.

Also i did search the forum and i have found some topics on specific time periods or about the idea of time like hours and minutes, but i have not found any thing about now-time back to a dynamic period, but i think this would be super awesome.