Just did a quick test, and ${originalDate} works properly.

This is where things can get a bit confusing. If you feed ${meta.Date/Time} to the caption template, it will pick up the contents of that metadata field in the image. But jAlbum also extracts some of the metadata, does some formatting on it, and makes is available with its own variable names. So, ${originalDate} is usually the better choice. But don't try ${meta.originalDate}, because that's not the name of the actual, image-embedded metadata field.

Also remember that all variable calls in jAlbum must be in curly braces, not parentheses. That one still catches me from time to time.

Post back if you get stumped on something.

My skins, at least, have full user's manuals - from any of the skin settings panels, click the "?" icon at upper right to pull up the manual page for that panel.

That's jAlbum's own scripting language. Has its roots in Java, but is unique to this app.

https://jalbum.net/help/en/Tags

Going back to the original question: Responsive skin.
The code that generates the content, like the comment is within the skin folder>res>js>main.js file. To add more to the line with the description you first need to look at the file data1.json generated in the album's root folder. Open it in a text editor to see the contents. Search for the data you want to add, like original date and see where it appears in the structure of the json file. An example of part of the file, with fileDate and originalDate is

{"path":"jakob-owens.jpg","image":{"path":"slides\/jakob-owens.jpg","width":1536,"height":995},"thumb":{"path":"thumbs\/jakob-owens.jpg","width":256,"height":166},"fileSize":239719,"name":"jakob-owens.jpg","rating":1,"comment":"Photo by <a href=\"https:\/\/unsplash.com\/@jakobowens1?utm_source=unsplash&utm_medium=referral&utm_content=creditCopyText\">Jakob Owens<\/a> on <a href=\"https:\/\/unsplash.com\/s\/photos\/photographer?utm_source=unsplash&utm_medium=referral&utm_content=creditCopyText\">Unsplash<\/a>","fileDate":"2024-06-17T11:26:05.0Z","category":"image","title":"I See You!","camera":{"originalDate":"2024-06-17T11:26:05.0Z"}},

To add more data than supplied you need to modify main.js in two places. First is the block that includes data from the data!.json file, it starts at line 337.

slides[imageIndex] = {

That block includes the description but not the original date, so you need to add it and the fallback file date.

originalDate: object.camera.originalDate,
 fileDate: object.fileDate
};

Next you need to change the code that injects the content into the webpage. Jump to line 811 which looks like this

if(slides[index].description != undefined){

This block needs changing to test if the new variables, originalDate and fileDate exist or not, but for now lets look at how to add those variables. originalDate is in the form

slides[index].originalDate

and fileDate is

slides[index].fileDate

You can try it by changing the description line like this

description.append("<p>" +  slides[index].fileDate + " " + slides[index].description + "</p>");

Then you need to re-arrange the block of code so that you test for originalDate not being undefined and if it is fall back to the fileDate variable.

The above is just to show how complicated it is to make adjustments to such a skin - I had to play with it a bit to find the code blocks and get the correct json structure. Using another skin is much easier!

Curiosity got the better of me, I think I remembered a bit from when the skin first appeared and I read the single page website page back then. But I'm too old to learn old tricks (again).