Nowadays what time is it really depends more on the lawyers,
economists, politicians and businessmen and much less on the
astronomers, geographers, surveyors, mathematicians and scientists
like in the 19th century and before.
Source:
http://www.math.nus.edu.sg/aslaksen/teaching/timezone.html
Singapore's time is actually around GMT 7+, but now is GMT 8+.
