Clock Changes in Hanoi, Vietnam

Daylight Saving Time (DST) Not Observed in Year 2021

Hanoi currently observes Indochina Time (ICT) all year.

Daylight Saving Time has never been used here.

Clocks do not change in Hanoi, Vietnam.

There is no previous DST change in Hanoi.

Which countries & states use DST and which do not?