Your server hosts were kind enough to enforce UTC timestamping.
What will be the timestamps of data downloaded into Oanda's MT4 terminal database?
it must enforce an offset based on time difference between reported server time and UTC.
It just requires a more sophisticated logic; roughly, compare the last knownreported MT4 server time on Friday to 21:00/22:00 UTC on Friday (rather than to UTC at request).
MT4/MT5 is a sort of Plato's Cave
Seems so.
Will getting data via MT5 work?