Singapore doesn't observe daylight saving time but Helena does. DST in Helena started on 10 March 2019 and will end on 03 November 2019. Once DST ends in Helena the time difference between Helena and Singapore will be 15:0 hours.
Time zone: MDT - Mountain Daylight Time (UTC/GMT -6)DST started on 10 March 2019DST will end on 03 November 2019Time zone difference / Flight distance
Time zone: SGT - Singapore Time (UTC/GMT +8)Time zone difference / Flight distance