From the Zorro UI looks like Chart.c is selected when the candlestick chart is displayed (I just double click the .t6 file to launch Zorro). When looking in Chart.c (one of the default scripts in Strategy/ folder, I don't see any timezone variable being set).
I've added the following line inside the if(is(INITRUN)) block and got this output:
printf("\n%d, %d, %d, %d, %d, %d", BarZone, HistoryZone, BrokerZone, LogZone, AssetMarketZone, AssetFrameZone);
24, 0, 0, 24, 24, -24