Could you please run the following commands in a terminal session:

write $zv
set exl=##class(%SYS.Python).Import("openpyxl")
set wbk=exl."load_workbook"( "your path_and_filename.xlsx" )
set sht=wbk.active
set cel=sht.cell(row,col)	// ROW and COL should point to a date-cell
write cel."data_type"
write cel.value.strftime("%d.%m.%Y")

Please post a screenshot here, even if you get some kind of error

Excel store date values as decimal values (or better, as flotaing poin) as dddd.tttt where ddd is the number of days since a base date (usually 1899-12-30) and tttt is: numberOfSecondsSinceMidnight / 86400, hence the value, you get is an date-object, and you have to format it according to your needs

Class DC.PyExcel Extends %RegisteredObject
{

ClassMethod Test(fn = "/home/kav/test/readtest.xlsx")
{
	set exl=##class(%SYS.Python).Import("openpyxl")
	set wbk=exl."load_workbook"(fn)
	set sht=wbk.active
	
	for row=1,2,3 {
		for col=1:1:3 {
			set cel=sht.cell(row,col)
			set typ=cel."data_type"
			set val=cel.value
			
			write ?col-1*15,$case(typ, "s":val, "n":$fn(val,",",2), "d":val.strftime("%a, %d.%m.%Y"), :"")
		}
		write !
	}
}

}

I'm just curious, what do you get, if you type write $view(-1,$job) in the output window of Studio?
See my screenshot, red=my input, yellow=Studio output