Basseterre doesn't observe daylight saving time but Tehran does. DST in Tehran started on 22 March 2019 and will end on 22 September 2019. Once DST ends in Tehran the time difference between Basseterre and Tehran will be 7:30 hours.
Time zone: AST - Atlantic Standard Time (UTC/GMT -4)Time zone difference / Flight distance
Time zone: IRDT - Iran Daylight Time (UTC/GMT +4:30)DST started on 22 March 2019DST will end on 22 September 2019Time zone difference / Flight distance