Broker with Alternative Daily Rollover Price Feed?

Can someone point me to a broker where I can get an MT4 demo account which has a price feed that doesn’t roll over at 5pm EST?

I’m interested in seeing how much of an impact slight differences in daily OHLC candles impacts the performance of a system I’m working on.

Most of the brokers seem to begin/end the day on NY time at 5pm EST. I’d like to peek at the charts of one that does not.

Thanks much.