On Fri, Oct 02, 2015 at 10:06:55AM -0400, Tom Lane wrote:
> The problem you'll have in defining timetzrange is that you first need to
> invent a "timetz - timetz" operator, which doesn't exist as a builtin
> function because the behavior seems not well-defined. What would you do
> with the timezone fields?
You'd
check whether both TZs are equal,
if so
ignore them
else
convert both operands to UTC,
do "time - time",
return result AT TIME ZONE UTC,
document that UTC is returned,
such that the user can know to apply "AT TIME ZONE ..."
to the result as needed.
That's not to say anything against the validity of your
other points :-)
Karsten
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