Online Trading. XM trading hours are between Sunday 22:05 GMT and Friday 21:50 GMT. When our dealing desk is closed, the trading platform does not execute trades and its features are only available for viewing. For any enquiries, technical difficulties, or urgent support, feel free to contact our 24-hour customer support by email or live chat The Trading Hours Of Forex | London Forex Open Nov 12, 2013 · Full Text. Forex Market Hours. Understanding the Trading Sessions of the Biggest Global Financial Market. The Forex Market is the largest financial market on the planet in terms of the value of transactions that take place with in excess of 4 trillion US dollars being exchanged each day.