On 12/12/2017 13:42, Lester Caine wrote:
> and it's the version data that is missing in the Oracle 'solution' ...
It's not that simple. Date/times are considered equal if their
conversion to UTC are equal, independent of region.

So, they are converted to UTC for storage. To convert to UTC, one needs
correct tzdata.

If tzdata is changed after conversion, conversion became wrong, as the
date/time will still be in UTC, but when converted back it will result
in wrong date/time.

So one cannot fix the back-conversion. It's initially stored incorrectly.


Adriano


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