Singapore's time is 8 hours ahead of GMT (GMT +8); noon in greenwich would equate to 8pm in Singapore.
12 noon
1700 GMT is 11:00 AM Central Time. Central Time is 6 hours behind GMT, so you would subtract 6 hours from 17:00 GMT to get the local time in Central Time.
time ball
1 hour
AM = Ante Meridiem (Latin for "before noon") PM = Post Meridiem (Latin for "after noon") GMT = Greenwich Mean Time, the standard time in London at 0° longitude
17:00 GMT is 11:00 AM Central Standard Time (CST) or 12 Noon Central Daylight Time (CDT).
2 hours after noon UTC
The time zone for Japan is GMT + 9 hours.
Japan is in the Japan Standard Time (JST) zone, which is UTC+9. Therefore, during the winter months when Daylight Saving Time is not in effect, the GMT of Japan is UTC+9.
Japan Standard Time (JST) UTC/(GMT) +9
Noon Eastern Time in the States which is 5 P.M. GMT.