Position of value in ListString

[Silvio6]

I have a JSON file I'm using in a journey via Data Source (called DiasHabiles) and I need to find the position of an specific date:

so for example, I want the position of the date "2026-01-06" which is the position 2

The solution AJO gives is something like this: 
getListItem(#{DiasHabiles.diasHabiles.Fecha_Habil},0)

but I need to hardcode the position, and I want to find the position of an specific date in that list.

how can I achieve that? Thanks!

[Mohan_Dugganab · Accepted solution]

@Silvio6 You can validate it on the lines of the following expression 

toString((indexOf(serializeList([
"2026-01-02", 
"2026-01-05", 
"2026-01-06", 
"2026-01-07", 
"2026-01-08",
"2026-01-09", 
"2026-01-12", 
"2026-01-13", 
"2026-01-14",
"2026-01-15",
"2026-01-16"], "", false),"2026-01-06"))/(length("2026-01-06"))) // Replace Individual Date and array fields with the respective XDM paths

[Silvio6]

the key was in "/lenght", amazing solution. Thanks!