[iso1631]

The sun rises in Singapore between 0655 and 0715 depending on the time of the year. How would changing the clock help at all?

[throw0101a]

It wouldn't, as it gets ~12 hours at both solstices:

* https://www.timeanddate.com/sun/singapore/singapore

DST is mostly for countries closer to the poles. See my other comment:

* https://news.ycombinator.com/item?id=26088383