Accurate File Dates for Kiefer's Archives

Behold, actual data from this webserver:

{
    ...,

    "Map Tilesets.txt": {
        "1765": {
            "secs": 1468445837.0,
            "text": "Wed Jul 13 16:37:17 2016"
        }
    },
    "Mary.md": {
        "3691": {
            "secs": 1574727385.0,
            "text": "Mon Nov 25 18:16:25 2019"
        }
    },
    "Material Lore.txt": {
        "654": {
            "secs": 1468445917.0,
            "text": "Wed Jul 13 16:38:37 2016"
        }
    },
    ...
}

I have a lot of files ^(what?) and I like to know how old things are.

It's personally important to me that I keep archives, as I've been making things since I was little and have moved and duplicated stuff from machine to machine over the years.

There's two ways I do this. One is to index earliest files ages found by file name, which is what I do for my notes and articles, as those rarely change file names (and a renamed version is generally renamed for a reason, ie. it's distinct enough to warrant renaming).

For non-text file types or for larger and older archives where there are more cases where the same file has been used in multiple places with different names, I have an open source notebook I use which you can try out for yourself!