Saint-Denis doesn't observe daylight saving time but Douglas does. DST in Douglas started on 31 March 2019 and will end on 27 October 2019. Once DST ends in Douglas the time difference between Saint-Denis and Douglas will be -4:0 hours.
Time zone: RET - Reunion Time (UTC/GMT +4)Time zone difference / Flight distance
Time zone: BST - British Summer Time (UTC/GMT +1)DST started on 31 March 2019DST will end on 27 October 2019Time zone difference / Flight distance