I don't see that on my windows machine. The internal check relies on same Olson database as OlsonNames but through the CCTZ lookup mechanism. Do you see this warning with all Timezones? "America/New_York", "Europe/Amsterdam"?
Could you please check if force_tz works as expected:
@steffilazerte Do you have the ability to test the dev version? I pushed a fix which works for me. I would be extremely grateful if you could check it asap. Lubridate was removed from CRAN because it failed on solaris, and I think it's the same issue.
This is a problem I've noticed on Windows only (not my Ubuntu machine). The warnings are also popping up in the AppVeyor tests (but not on Travis CI for Ubuntu and Mac).
I think it's only in lubridate v0.7.0 (related to c10c8cf) but I had problems trying to install v0.6.0 to double check.
with_tz()warns about invalid timezones, but returns them correctly anyway...
If I try a non-legitimate name I get a second warning message (and UTC):
The first two are both legitimate timezones (i.e. they're in OlsonNames())
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