Advanced Preview Mode: One hour difference - not the same hour as the one used in the engine

I created a container with a time based publishing (start date: tomorrow and end:date: after tomorrow).

When trying to preview in time such a container, I select the date of tomorrow and I see nothing despite the fact that the hour was incremented of 5 minutes compared to the current time. In fact there is one hour delay (winter hour?) compared to what is mentionned in the container engine in order to correctly preview the page at the right hour.

Some customers are asking for very precise previewing capabilites as their content is changing on an hourly basis (e.g vodafone). So the hour used in the container engine and in the preview mode should be the same.