What time is 11pm ET/PT in Singapore time? whats ET/PT

ET is short for "Eastern (USA) Time"
PT is short for "Pacific (USA) Time"
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If this is listed as 11 pm ET/PT, it is originally broadcast at 11 pm ET (Eastern Time) and then rebroadcast at 11 pm PT (Pacific Time)
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It is currently:
Atlanta* Wed 7:30 AM
and
Singapore Wed 7:30 PM
Which amounts to a 12-hour time difference
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Therefore; to participate in the original broadcast at 11 pm ET (Example: Atlanta, Georgia):
-> You will 'tune in' at 11 am Singapore Time!
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I hope this is helpful.
P.S. You can use the referenced website to find the local time in cities around the world.