我有一个从数据记录器获取的时间序列数据,该数据记录器设置为一个没有夏令时的时区( NZST 或UTC + 12:00),则数据跨度为数年。数据记录器不考虑DST更改,而是在有/没有DST的情况下与本地时间同步(取决于部署它的人)。
但是,当我将数据输入R ,我无法正确使用 as.POSIXct 忽略DST。我在具有以下设置的Windows计算机上使用的是R 2.14.0:
> Sys.timezone() [1] NZDT > Sys.getlocale( LC_TIME) [1] English_New Zealand.1252这是整个春季DST更改的三个时间戳,每个时间戳间隔1小时:
ts_str<-c( 28/09/2008 01:00, 28/09/2008 02:00, 28/09/2008 03:00)> as.POSIXct(ts_str,format =%d /%m /%Y%H:%M,tz =) [1] 2008-09-28 01:00:00 NZST NA [3] 2008-09-28 03:00:00 NZDT > as.POSIXct(ts_str,format =%d /%m /%Y%H:%M,tz = UTC) [1] 2008-09-28 01:00:00 UTC 2008-09-28 02:00:00 UTC [3] 2008-09-28 03:00:00 UTC如您所见,时钟从1:59跳到3:00,所以2:00无效,因此不适用。此外,我可以使用 tz = UTC 使其忽略DST更改。但是,我宁愿保留正确的时区,因为我想将其他数据序列与 DST(NZDT或UTC + 13:00)一起记录下来(通过合并)进行分析。
如何配置 tz 参数在MS Windows计算机上?我尝试了很多事情,例如 NZST,新西兰标准时间, UTC + 12:00, + 1200等,但是没有运气。还是修改其他设置?
解决方案您可以使用 tz = Etc / GMT + 12 :
as.POSIXct(ts_str,format =%d /%m /%Y %H:%M,tz = Etc / GMT + 12) [1] 2008-09-28 01:00:00 GMT + 12 2008-09-28 02:00:00 GMT + 12 [3] 2008-09-28 03:00:00 GMT + 12有关可用时区使用的完整列表,
dir(file.path(R.home( share ), zoneinfo),recursive = TRUE)有几个.tab文件在那里不是时区,但包含一些信息,但是我的正则表达式不足以使用 dir 的pattern参数将它们排除。 p>
I have time series data obtained from a data logger that was set to one time zone without daylight savings (NZST or UTC+12:00), and the data spans a few years. Data loggers don't consider DST changes, and are synchronized to local time with/without DST (depending who deployed it).
However, when I get the data into R, I'm unable to properly use as.POSIXct to ignore DST. I'm using R 2.14.0 on a Windows computer with these settings:
> Sys.timezone() [1] "NZDT" > Sys.getlocale("LC_TIME") [1] "English_New Zealand.1252"Here are three timestamps across the spring DST change, each are spaced 1 hour apart:
> ts_str <- c("28/09/2008 01:00", "28/09/2008 02:00", "28/09/2008 03:00") > as.POSIXct(ts_str, format="%d/%m/%Y %H:%M", tz="") [1] "2008-09-28 01:00:00 NZST" NA [3] "2008-09-28 03:00:00 NZDT" > as.POSIXct(ts_str, format="%d/%m/%Y %H:%M", tz="UTC") [1] "2008-09-28 01:00:00 UTC" "2008-09-28 02:00:00 UTC" [3] "2008-09-28 03:00:00 UTC"As you can see, the clocks jumped forward at 1:59 to 3:00, so 2:00 is invalid, thus NA. Furthermore, I can use tz="UTC" to get it to ignore DST changes. However, I'd rather keep the correct time zone since I have other data series recorded with DST (NZDT or UTC+13:00) that I'd like to blend in (via merge) for my analysis.
How do I configure the tz parameter on a MS Windows computer? I've tried many things, such as "NZST", "New Zealand Standard Time", "UTC+12:00", "+1200", etc., but no luck. Or do I modify some other setting?
解决方案You can use tz="Etc/GMT+12":
as.POSIXct(ts_str, format="%d/%m/%Y %H:%M", tz="Etc/GMT+12") [1] "2008-09-28 01:00:00 GMT+12" "2008-09-28 02:00:00 GMT+12" [3] "2008-09-28 03:00:00 GMT+12"For a full list of available timezones use,
dir(file.path(R.home("share"),"zoneinfo"), recursive=TRUE)There are a couple of of .tab files in there which aren't timezones but hold some information, but my regex-fu isn't good enough to be able to exclude them with the pattern argument to dir.
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