as.POSIXct，日期时间包括午夜 [英] as.POSIXct with datetimes including midnight

问题描述

我想将存储为字符的日期时间转换为日期时间对象。
但是，如果日期时间包括午夜，则生成的datetime对象将排除时间部分，该时间部分将在以后的函数中使用时引发错误（此处不需要-但是该函数可提取指定位置和日期的天气数据，

I am wanting to convert date-times stored as characters to date-time objects. However if a date time includes midnight then the resulting datetime object excludes the time component, which then throws an error when used in a later function (not needed here - but a function that extracts weather data for specified location and date-time).

示例代码：

example.dates <- c("2011-11-02 00:31:00","2011-11-02 00:00:00","2011-11-02 00:20:22")
posix.dates   <- as.POSIXct(example.dates, tz="GMT", format="%Y-%m-%d %H:%M:%S")
posix.dates
posix.dates[2]

NB时间仅在单独调用包含午夜的datetime时被排除（原子向量）。

NB times is only excluded when the datetime containing midnight is called on it's own (atomic vector).

是否可以将时间数据保留为午夜时间？可以建议其他功能吗？

Is there a way of retaining the time data for midnight times? Can you suggest an alternative function?

推荐答案

好的，过一段时间后，我可以再次确认您的问题。

Okay, after some time I can reconfirm your problem.

对我来说，这似乎是R中的错误。建议您在 https://bugs.r-project.org/bugzilla3/ 。

For me this looks like a bug in R. I would suggest you to report it on https://bugs.r-project.org/bugzilla3/.

作为一种临时的解决方法，您可以尝试是否有助于覆盖 strptime 函数，如下所示：

As a temporary workaround, you could try if it helps to overwrite the strptime function like this:

strptime <- function (x, format, tz = "") 
{
    if ("POSIXct" %in% class(x)) {
        x
    } else {
        y <- .Internal(strptime(as.character(x), format, tz))
        names(y$year) <- names(x)
        y
    }
}

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