as.Date()不遵守POSIXct时区 [英] as.Date() does not respect POSIXct time zones

问题描述

好的，这是r as.Date函数从带时区的POSIXct转换时的一个微妙的怪癖"，我想知道这是否是一个错误.

Okay so here is a subtle "quirk" in the r as.Date function converting from a POSIXct with a timezone, which I am wondering if it is a bug.

> as.POSIXct("2013-03-29", tz = "Europe/London")
[1] "2013-03-29 GMT"
> as.Date(as.POSIXct("2013-03-29", tz = "Europe/London"))
[1] "2013-03-29"

到目前为止没有问题，但是.....

So far no problem, but.....

> as.POSIXct("2013-04-01", tz = "Europe/London")
[1] "2013-04-01 BST"
> as.Date(as.POSIXct("2013-04-01", tz = "Europe/London"))
[1] "2013-03-31"

有人看到吗?这是一个错误还是另一个怪癖?愚人节?

Anybody seen this? Is this a bug or another quirk? April fools?

推荐答案

as.Date.POSIXct 的默认时区为"UTC" (请参见帮助页面)).尝试 as.Date(as.POSIXct("2013-04-01"，tz =欧洲/伦敦")，tz =欧洲/伦敦").

The default time zone for as.Date.POSIXct is "UTC" (see the help page). Try as.Date(as.POSIXct("2013-04-01", tz = "Europe/London"),tz = "Europe/London").

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