Save data from Arduino to PC in CSV file in real time by Processing code

Processing Electronics (Arduino, etc.)
2

try

String filename;

void setup() {}
void draw() {}
void keyPressed() {  //variables used for the filename timestamp
  //variable as string under the data folder set as data/yyyy-mm-dd--hh-min-sec_millis.csv
  filename = "data/" + year()+"-"+ nf(month(),2,0) +"-"+ nf(day(),2,0)+"--"+ nf(hour(),2,0) +"-"+ nf(minute(),2,0) +"-" + nf(second(),2,0) +"_"+millis() + ".csv";
  // please note that millis() is the milli seconds since start of sketch!
  println(filename);
}

https://processing.org/reference/millis_.html

https://processing.org/reference/nf_.html

shows like

data/2019-07-25--09-18-50_9401.csv
data/2019-07-25--09-18-51_10340.csv
data/2019-07-25--09-18-52_11138.csv
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