Tbilisi doesn't observe daylight saving time but Bialystok does. DST in Bialystok started on 31 March 2019 and will end on 27 October 2019. Once DST ends in Bialystok the time difference between Tbilisi and Bialystok will be -3:0 hours.
Time zone: GET - Georgia Standard Time (UTC/GMT +4)Time zone difference / Flight distance
Time zone: CEST - Central European Summer Time (UTC/GMT +2)DST started on 31 March 2019DST will end on 27 October 2019Time zone difference / Flight distance