I don't think you can do that in cron. Maybe with `0 0 * * 4` you should run a script every thursday and in that script, you can check if it is the thursday before the second monday of the month.
I don't think you can do that in cron. Maybe with `0 0 * * 4` you should run a script every thursday and in that script, you can check if it is the thursday before the second monday of the month.