awk timestamp set in begin block

Question

I'm setting a timestamp in a begin block:

BEGIN  { 
  timestamp = strftime("%Y%m%d%H%M%S");
}

I don't update timestamp again in the rest of the script. I expect that timestamp won't change but it does.

Later in the script, I print $0 to a file:

FNR>1{
  #do some stuff
  print $0 > "/mnt/data/logs/TEST_"timestamp".csv"
  ...

timestamp changes and it keeps printing to a new file. . . TEST_1.csv, TEST_2.csv . . .

It works as expected on a small file but when I use a full data file it prints multiple files

Answer 1

OK guys, I figured out the issue. I am calling an auxiliary awk script that I didn't think was relevant. Sorry for not including that originally. So when I call a logger function on that script it updates the timestamp variable. I fixed the issue by simply changing timestamp to timestamp1 on my script.

Thanks to all that responded and put up with my awk inexperience!