What time ( in GMT ) does forex broker open or close

On Saturday and Sunday I can’t trade because the market is closed, I want to know the exactly time ( GMT) when the market is closed and opened.

Thank!

Region City Open (GMT) Close (GMT)

Europe London 8:00 am 5:00 pm
Frankfurt 7:00 am 4:00 pm
America New York 1:00 pm 10:00 pm
Chicago 2:00 pm 11:00 pm
Asia Tokyo midnight 9:00 am
Hong Kong 1:00 am 10:00 am
Pacific Sydney 10:00 pm 7:00 am
Wellington 10:00 pm 6:00 am

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Thank you!
Is it applied for all the week or some day at week?

In Summer and Winter, there may be little bit difference.

To summarise the above list, the earliest you can do anything (i.e. place an order, close an existing order, or modify an order) is 21:00 GMT on Sunday and the latest is 20:59 GMT on Friday. Well at least that is the case with my broker.