MT5 provides the flexibility of up to 21-time frame. To accommodate this flexibility, the MT5 server stores its base charts in M1 and all other charts and derived from the base charts. On the MT5, the start of the day starts from 00:00 to 24:00.
Due to the above, the MT5 H4 charts would start at 00:00 and repeated every 4 hours.
For example, XAUUSD starts on the 01:00 and ends 24:00.
- MT4 H4 chart will start at 01:00 to 05:00
- MT5 H4 chart will start at 00:00 to 04:00