Replace direct access to tzone attribute #38
Merged
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It's best to access object attributes using provided methods, instead
of calling attr(x, 'foo'). So xts::indexTZ() should have been used.
The tzone attribute is being removed from the xts object after xts
version 0.11-2, and will only be attached to the index. indexTZ() is
also deprecated and replaced by tzone(), so we shouldn't use indexTZ().
Add a tzone() function that will handle tzone attributes for xts and
POSIXct objects. The xts index had a tzone attribute in xts version
0.8-8, so get the index attribute for xts objects, and the tzone
attribute for POSIXct (or any other) object. Use xts::tzone() if the
loaded xts version is greater than 0.11-2.
See joshuaulrich/xts#245 for details.
Fixes #37.