template filters not working for date/time in confirmation

[LaurensBurger]

Product versie / Product version

2.7.x - 2.8.x

Customer reference

dewol/hogev: 29

Omschrijf het probleem / Describe the bug

it's impossible to use a date with a filter to provide a local/readable date in the confirmation page and mail:

today: {{ today|date:"d/m/Y" }}
datefromform: {{ datum|date:"d/m/Y" }}

results in:

i expect the same result in both cases since both "today" and "datum" are dates.
right now the only way to show the dates form a form variable is: YYYY/MM/DD

Stappen om te reproduceren / Steps to reproduce

No response

Verwacht gedrag / Expected behavior

No response

Screen resolution

None

Device

None

OS

None

Browser

No response

[sergei-maertens]

Related to #2324 - this is because formio component values are not actual datetime objects, they're strings.

[joeribekker]

Refinement: This requires us to add typing information (ie. convert everything to Python types) so we can do template operations on it. However, JSON-logic then again doesnt understand Python types...

Fixing this properly will take a significant amount of time (read weeks/months).

[joeribekker]

We can only pick this up with proper funding.