problems with the call today

Hi all
right now I am trying to dial in as host to host our call. AT&T are trying
to tell me that the call is not happening for 1hr i.e. until 5:30 gmt. We
must have forgotten that British Summer Time began last week and we are now
1hr out.
I have asked that the call begin at 16:30 BST.

Thanks
Mavis