Yes, but in a roundabout way. With -gmt, if the next argument is false says use local time, else use GMT.
Did that work for you? I did learn the UK has only one time zone, which is GMT, which sort of puts a wrench in my logic. However, if you are on a machine that did not flip from standard to savings time, or vice versa, it may explain why you were an hour off.
Cheers,
Bob
Robert Milfajt
Northwestern Medicine
Chicago, IL