将字符串转换为日期，格式为："dd.mm.yyyy"。

Question

D <- "06.12.1948"                 # which is dd.mm.yyyy
as.Date(D, "%d.%m.%y")            # convert to date
[1] "2019-12-06"                  # ????    

我错过了什么？

Sys.getlocale(category = "LC_ALL") [1] "LC_COLLATE=German_Austria.1252;LC_CTYPE=German_Austria.1252;LC_MONETARY=German_Austria.1252;LC_NUMERIC=C;LC_TIME=German_Austria.1252"

- Kay

Answer 1

格式是区分大小写的（"%y"是模糊且依赖于系统的，我相信）：

as.Date(D, "%d.%m.%Y")
[1] "1948-12-06"

帮助主题?strptime具有详细信息：

 ‘%y’ Year without century (00-99).  On input, values 00 to 68 are
      prefixed by 20 and 69 to 99 by 19 - that is the behaviour
      specified by the 2004 and 2008 POSIX standards, but they do
      also say ‘it is expected that in a future version the default
      century inferred from a 2-digit year will change’.

- mdsumner

---

进一步解释，"%y"是用于2位数年份的，因此它会读取1948年中的"19"。你需要使用"%Y"。 - Hong Ooi

在这种情况下，使用Lubridate也是一个非常好的选择。以下代码可以正常工作。data %>% mutate(date_variable = as.Date(dmy(date_variable))) - landrower

Answer 2

为了避免记忆日期格式，我们可以使用封装好的解决方案。

1）使用lubridate库

lubridate::dmy(D)
#[1] "1948-12-06"

2) 使用anytime

anytime::anydate(D)
#[1] "1948-06-12"

- Ronak Shah

Answer 3

在我看来，Lubridate是最好的选择。以下代码将很好地工作。

`data %>% mutate(date_variable = as.Date(dmy(date_variable)))`

有趣的是，当我将as.Date()和dmy()分别调用时，发现dmy()的行为很奇怪。

- landrower

Answer 4

可能对某些人有帮助。我在 Cole Beck 的教程“在 R 中处理日期时间”中找到了这个函数。该函数可以识别您的数据格式。

# FUNCTION guessDateFormat @x vector of character dates/datetimes @returnDates return
# actual dates rather than format convert character datetime to POSIXlt datetime, or 
# at least guess the format such that you could convert to datetime
guessDateFormat <- function(x, returnDates = FALSE, tzone = "") {
x1 <- x
# replace blanks with NA and remove
x1[x1 == ""] <- NA
x1 <- x1[!is.na(x1)]
if (length(x1) == 0)
  return(NA)
# if it's already a time variable, set it to character
if ("POSIXt" %in% class(x1[1])) {
x1 <- as.character(x1)
}
dateTimes <- do.call(rbind, strsplit(x1, " "))
for (i in ncol(dateTimes)) {
dateTimes[dateTimes[, i] == "NA"] <- NA
}
# assume the time part can be found with a colon
timePart <- which(apply(dateTimes, MARGIN = 2, FUN = function(i) {
                        any(grepl(":", i))
                        }))
# everything not in the timePart should be in the datePart
datePart <- setdiff(seq(ncol(dateTimes)), timePart)
# should have 0 or 1 timeParts and exactly one dateParts
if (length(timePart) > 1 || length(datePart) != 1)
  stop("cannot parse your time variable")
timeFormat <- NA
if (length(timePart)) {
# find maximum number of colons in the timePart column
ncolons <- max(nchar(gsub("[^:]", "", na.omit(dateTimes[, timePart]))))
if (ncolons == 1) {
timeFormat <- "%H:%M"
} else if (ncolons == 2) {
timeFormat <- "%H:%M:%S"
} else stop("timePart should have 1 or 2 colons")
}
# remove all non-numeric values
dates <- gsub("[^0-9]", "", na.omit(dateTimes[, datePart]))
# sep is any non-numeric value found, hopefully / or -
sep <- unique(na.omit(substr(gsub("[0-9]", "", dateTimes[, datePart]), 1, 1)))
if (length(sep) > 1)
  stop("too many seperators in datePart")
# maximum number of characters found in the date part
dlen <- max(nchar(dates))
dateFormat <- NA
# when six, expect the century to be omitted
if (dlen == 6) {
if (sum(is.na(as.Date(dates, format = "%y%m%d"))) == 0) {
dateFormat <- paste("%y", "%m", "%d", sep = sep)
} else if (sum(is.na(as.Date(dates, format = "%m%d%y"))) == 0) {
dateFormat <- paste("%m", "%d", "%y", sep = sep)
} else stop("datePart format [six characters] is inconsistent")
}else if (dlen == 8) {
if (sum(is.na(as.Date(dates, format = "%Y%m%d"))) == 0) {
dateFormat <- paste("%Y", "%m", "%d", sep = sep)
} else if (sum(is.na(as.Date(dates, format = "%m%d%Y"))) == 0) {
dateFormat <- paste("%m", "%d", "%Y", sep = sep)
} else stop("datePart format [eight characters] is inconsistent")
} else {
stop(sprintf("datePart has unusual length: %s", dlen))
}
if (is.na(timeFormat)) {
format <- dateFormat
} else if (timePart == 1) {
format <- paste(timeFormat, dateFormat)
} else if (timePart == 2) {
format <- paste(dateFormat, timeFormat)
} else stop("cannot parse your time variable")
if (returnDates)
  return(as.POSIXlt(x, format = format, tz = tzone))
format
}

# generate some dates
mydates <- format(as.POSIXct(sample(31536000, 20), origin = "2011-01-01", tz = "UTC"), "%m.%d.%Y %H:%M")

mydates
## [1] "02/07/2011 06:51" "11/21/2011 17:03" "09/17/2011 22:42" "02/16/2011 13:45"
## [5] "12/14/2011 19:11" "09/08/2011 09:22" "12/06/2011 14:06" "02/02/2011 11:00"
## [9] "03/27/2011 06:12" "01/05/2011 15:09" "04/15/2011 04:17" "10/20/2011 14:20"
## [13] "11/13/2011 21:46" "02/26/2011 03:24" "12/29/2011 11:02" "03/17/2011 02:24"
## [17] "02/27/2011 13:51" "06/27/2011 08:36" "03/14/2011 10:54" "01/28/2011 14:14"
guessDateFormat(mydates)

[1] "%m.%d.%Y %H:%M"

- Tymo