Question

我有几个月的数据，并希望将它们转换为日期对象。

我试过as.Date(as.character(data$Date), format = '%Y %B'没有成功。怎么解决这个问题？

代码＆amp;数据

> head(SE.10Y)
           Date  SE.10Y
1  1987 January 11.7385
2 1987 February 11.5000
3    1987 March 11.2586
4    1987 April 11.2385
5      1987 May 11.8153
6     1987 June 11.8120

> dput(droplevels(head(SE.10Y)))
structure(list(Date = structure(c(3L, 2L, 5L, 1L, 6L, 4L), .Label = c("1987 April", 
"1987 February", "1987 January", "1987 June", "1987 March", "1987 May"
), class = "factor"), SE.10Y = c(11.7385, 11.5, 11.2586, 11.2385, 
11.8153, 11.812)), .Names = c("Date", "SE.10Y"), row.names = c(NA, 
6L), class = "data.frame")

> as.Date(as.character(head(SE.10Y)$Date), format = '%Y %B')
[1] NA NA NA NA NA NA

Answer 1

假设你想要月初（以UTC为单位）并使用lubridate，你会得到：

dates <- c("1987 April",  "1987 February", "1987 January", "1987 June", "1987 March", "1987 May")
lubridate::ymd(paste(dates,"01"))
[1] "1987-04-01 UTC" "1987-02-01 UTC" "1987-01-01 UTC" "1987-06-01 UTC" "1987-03-01 UTC" "1987-05-01 UTC"

如何将“1987年1月”字符串转换为Date对象？

1 个答案: