[HELP] New TZ.h/IANA timezones not working with my old code for setting the time

[meltdown03]

I have a bunch of sketches that all use the same function to set the time:

void setClock() {
  configTime(TZ * 3600, 0, "pool.ntp.org", "time.nist.gov");
  Serial.print("Waiting for NTP time sync: ");
  time_t now = time(nullptr);
  while (now < 8 * 3600 * 2) {
    delay(500);
    Serial.print(".");
    yield();
    now = time(nullptr);
  }
  Serial.println();
  localtime(&now);
  Serial.print("Current local time: ");
  Serial.println(ctime(&now));
}

When I try to use TZ_America_Chicago in place of TZ *3600, 0 in the configTime function, I get the UTC time when printing ctime(&now)
Does the change require something else? I've tried to look in the example, which does work, but can't find the magic code to make mine work.

Thanks
EDIT:
I got it figured out by going through the example step-by-step and ended up with this:

void setClock() {
  configTime(TZ, "pool.ntp.org", "time.nist.gov");
  timeval tv = { 0, 0 };
  timezone tz = { 0, 0 };
  settimeofday(&tv, &tz);
  now = time(nullptr);
  Serial.print("Waiting for NTP time sync: ");
  while (now < 8 * 3600 * 2) {
    delay(250);
    Serial.print(".");
    yield();
    now = time(nullptr);
  }
  Serial.println();
  Serial.print("Current time: ");
  Serial.print(ctime(&now));
  Serial.println();
}

As you can see, the settimeofday(&tv, &tz) and the 2 lines above are new and was able to remove the localtime(&now) line further down. All is working now but if there is another solution, I'd be happy to know.

[meltdown03]

I got it working, so if the solution in my edited OP is the proper way to do this let me know. I'll close the issue or it can just be closed.

[meltdown03]

Pull #6828 fixed my issue so I no longer need to change my normal time setting code. Thank you!