Typoscript image change every 15 days - image

Question

I would like to make a change of image say every 15 days. Or twice a month. When the date is between the 1 and 15 is an image, and if it is from 16 to 30 another, so on, are 24 images in the year. I would like it to be the typoscript that manages the change of the image.
I took the following typosript:
lib.headerlogo1 = COA
lib.headerlogo1 {
10 = LOAD_REGISTER
10 {
divSem.cObject = TEXT
divSem.cObject {
data = date:U
strftime = %U
current = 1
setCurrent.data = date:U
setCurrent.wrap = |/2
prioriCalc = 1
}
}
20 = FILES
20 {
references {
data = levelmedia: -1, slide
}
renderObj = IMAGE
renderObj {
file.import.dataWrap = {file:current:storage}:{file:current:identifier}
#file.import.listNum = 0
altText.data = file:current:title
# Affiche bien la valeur de : divSem
#stdWrap.insertData = 1
#stdWrap.wrap = <div class="banner{register:divSem}">|</div>
}
# insertData = 1
insertData = 1
# IT'S FAILLED !!
begin = {register:divSem}
maxItems = 1
}
30 = TEXT
30 {
stdWrap.insertData = 1
stdWrap.wrap = <div class="{register:divSem}">|</div>
}
}
The problem is that I can not start the value of the registry begin = {register:divSem} ... It always starts at 0! Do you have an idea ? The display of the registers in 30 = TEXT is correct.
Do you have a good idea to modify the typoscript?

Answer 1

I just found the solution, instead of begin = {register: divSem}, I did this:
begin.cObject = TEXT
begin.cObject {
value = 0
value.override.cObject = CASE
value.override.cObject {
key.data = register:divSem
1 = TEXT
1.value = 1
2 = TEXT
2.value = 2
...
24 = TEXT
24.value = 24
default = TEXT
default.value = 2
}
}
Maybe there is more simple, if you have an idea, I'm interested.
Best regards.

Answer 2

You found the important detail: you need a .cObject to fill in any data in the simple property.
Why so complicated with a CASE that outputs the same as the key?
So the simplest way would be:
begin.cObject = TEXT
begin.cObject.data = register:divSem
maybe this also worked like you do in .30:
begin = {register:divSem}
begin.insertData = 1
and a more direct way of your .30:
instead of an .insertData for a .wrap use .dataWrap
begin.stdWrap.dataWrap = {register:divSem}
:
30 = TEXT
30.dataWrap = <div class="{register:divSem}">|</div>