MT4 trading platform is set to GMT+3(during summer time in US). Trading begins at 00:00 platform time, with daily rollover occurring at the same time each day.

During Winter Time in US, the trading server time is set to GMT+2.

The MT4 server time is adjusted according to the closing time of NY exchange market. As in, when the MT4 time is 00:00, the Exchange Market in NY closes. And that is also when SWAP occurs.

This time cannot be changed on the platform.