That's a good point although I would prefer to have a deterministic conversion that handles historic changes. But I get the point and having a source of truth for the conversion could be better as it won't be affected by bugs in the conversion of deemed right. It does mean maintaining two values though.
Presumably if the conversion logic changes. Eg user enters a future date in a place but the timezone in that place changes in the future.
That's a good point although I would prefer to have a deterministic conversion that handles historic changes. But I get the point and having a source of truth for the conversion could be better as it won't be affected by bugs in the conversion of deemed right. It does mean maintaining two values though.