My server runs in the GMT timezone, which means it switches to British Summer Time in the summer.
I want a cron job to run in UTC as it accesses an external service that runs in that timezone.
i.e. In the winter, my job should run when the server time is 1am (GMT = UTC) and in the summer at 2am (GMT is ahead of UTC one hour).
I do not want to change the server to use UTC for its timezone, as other jobs run according to local time. N.B. The job I run at 1am doesn't itself access time info so doesn't need to know what timezone it's running in. It just needs to run at a UTC time.