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