string 将日期时间字符串转换为 R 中的 POSIXct 日期/时间格式
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converting datetime string to POSIXct date/time format in R
提问by CFrench
Consider a string in the format
考虑格式中的字符串
test <- "YYYY-MM-DDT00:00:00.000-08:00"
My goal is to convert those strings to POSIXct
format so that I can plot the data. my initial thought was to use
我的目标是将这些字符串转换为POSIXct
格式,以便我可以绘制数据。我最初的想法是使用
as.POSIXct(test)
...but that seems to truncate the datetime to just date. Any thoughts? The help info for as.POSIXct
seems to imply that the input should be date and time separated by a space, not by a "T". Is this my issue?
...但这似乎将日期时间截断为日期。有什么想法吗?的帮助信息as.POSIXct
似乎暗示输入应该是由空格分隔的日期和时间,而不是由“T”分隔。这是我的问题吗?
回答by thelatemail
You need to specify a format for your conversion. Take a read of ?strptime
to see all of the options for date formats.
您需要为转换指定格式。阅读?strptime
以查看日期格式的所有选项。
#YYYY-MM-DDT00:00:00.000-08:00
test <- "2013-12-25T04:32:16.500-08:00"
z <- as.POSIXct(test,format="%Y-%m-%dT%H:%M:%OS")
op <- options(digits.secs = 3)
z
#[1] "2013-12-25 04:32:16.5 EST"