An example of how to format timestamps with flux.
import "csv"
import "strings"
csvData =
"
Datum,Watt
30.06.2022,1.24
01.07.2022,1.46
02.07.2022,0.0
03.07.2022,0.0
04.07.2022,0.0
05.07.2022,0.0
06.07.2022,1.35
07.07.2022,3.83
"
data = csv.from(csv: csvData, mode: "raw")
data
|> map(fn: (r) => ({ r with _value: "${strings.split(v: r.Datum, t: ".")[2]}-${strings.split(v: r.Datum, t: ".")[1]}-${strings.split(v: r.Datum, t: ".")[0]}" }))
|> toTime()
