I have a Longines Conquest Perpetual Calendar L1.627.4 that I purchased a year ago. It is working well and I managed to set the month and year cycle so the Perpetual Calendar works properly. However, I have noticed twice over the last year that the time has suddenly changed by one hour exactly. I belive this is a Daylight Saving feature of the watch. However, where I live there is no Daylight Saving! I wish to switch the feature off. Can anyone help me find out how to do this?