timezone for cron

[Chiny]

Currently running OPNsense 23.1.5_4-amd64 with plugin os-speedtest-community 0.9_3

cron is scheduled to run speedtest once per day, at 20:05 in the OPNsense GUI.   Now that summertime has arrived and the timezone has moved from +0000 to +0100, cron runs an hour earlier at 19:05 according to the speedtest output.

OPNsense GUI Dashboard displays +0100 time correctly.   I've double checked tzsetup to check my timezone.   (Shell) date shows the +0100 time correctly.    Presumably cron allows for TZ ?   Or have I missed a config  :-[