The USA has several time zones so there is not a single answer to your question.
Also, daylight savings time is different between the two places so that will have to be know to answer as well.
11am
5pm
2pm
5pm GMT
Regular trading hours which is 9AM - 5PM UK time
it will be 4:00 am of the previous day
ther is a 5 hour time difference between Eastern Standard time and the UK. eg: 12 noon in NewYork = 5PM in London England.
5pm UTC = 9am PST = 10am PDT
London and New York are 12 hours apart. 5pm Sunday evening in London = 5am Sunday morning in New York City
Eastern is always one hour more. 5PM CST->6PM EST
Western Australia is 8 hours ahead of London UK GMT so 12.00 (midday) is 8.00 pm. So to answer your question 5pm in Western Australia the time in London UK is 9.00am. Hope that helps
5pm
5PM