In-line below
On 23/04/2015 14:01, Bos, Roger wrote:
Dear All,
I would like to learn the proper way to set the default time zone so I get the
correct date for my files. The code below is non-reproducible (sorry) because
it is based on a file on my system, but I hope someone will be able to help me
anyway.
I have a file that was last modified on 4/21/2015:
file.info("E:/snap/q/snap_q_q1_" %+% endPeriod %+% ".txt")$mtime
[1] "2015-04-21 20:26:33 EDT"
When I convert that to a date, I gives me 2015-04-22. I read about timezones
and saw that there are two possible places to set the default values: One as a
system variable and one as an option. To be safe I set both:
Sys.setenv(TZ='America/New_York')
Sys.getenv("TZ")
[1] "America/New_York"
options(tz='America/New_York')
getOption("tz")
[1] "America/New_York"
as.Date(file.info("E:/snap/q/snap_q_q1_" %+% endPeriod %+% ".txt")$mtime)
[1] "2015-04-22"
But as you can see R still gives me the wrong date. I can get the correct date
as follows:
as.Date(file.info("E:/snap/q/snap_q_q1_" %+% endPeriod %+% ".txt")$mtime,
tz='America/New_York')
[1] "2015-04-21"
But my question is why is the as.Date function not using the timezone I have
set?
Because it has a tz= parameter which sets its time zone. I think you
need to write your own wrapper function to pick up your preferred timezone.
Thank you in advance,
Roger
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--
Michael
http://www.dewey.myzen.co.uk/home.html
______________________________________________
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
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