Last date update return from layer

Question

Hello There,

I have an application, ExB, with one layer. I tried to type Arcade expression to return to me the last date update (printscreen)

layer from https://services6.arcgis.com or from the included layer from aplication.

I don't know how to type a formula.

My tried:
"Last date update: " + Text(Date($dataSources('dataSource_1')), "MM.DD.YYYY")

Where layer ID it's dataSource_1 but not works, for layer name too, what's is wrong?

Do you know how to return the date?

kenbuja · Answer

"yourField" is the name of the date field in your layer. "DESC" just means to sort the attributes in that field in descending order. Please refer to the OrderBy function documentation

Piotrek6116 · Answer

Thanks for your response, But how to get "your Field DESC" ?

I not sure I want to provide any new attributes in the layer. I am looking for a solution to take information from layer metadata

kenbuja · Answer

The section of the code "$dataSources('dataSource_1')" will give you the FeatureSet, but then you have to do some additional things to get the latest date. You would then have to sort the FeatureSet by the date field (line 2), get the first feature (line 3), then pass the attribute from the date field into the text expression (line 4). That would look something like this, if "yourField" is the name of the date field.

var fs = $dataSources("dataSource_1");
var sorted = OrderBy(fs, "yourField DESC");
var feat = First(sorted);
return "Last date update: " + Text(feat.yourField, "MM.DD.YYYY");