[英]How to convert date to datetime to seconds since UNIX epoch in R with lubridate?
I'm noticing this very confusing behavior.我注意到这种非常令人困惑的行为。
library(lubridate)
x = as_date(-25567)
as.integer(as_datetime(x)) # Returns NA
How can I get this to return the seconds since (or in this case before) UNIX epoch?我怎样才能让它返回自(或在这种情况下之前)UNIX 时代以来的秒数?
This works with base R, now that we covered that you really want as.Date("1970-01-01")
.这适用于基础 R,现在我们已经介绍了您真正想要的as.Date("1970-01-01")
。
R> as.POSIXct("1900-01-01 00:00:00")
[1] "1900-01-01 CST"
R> as.numeric(as.POSIXct("1900-01-01 00:00:00"))
[1] -2208967200
R>
I vaguely recall some OS-level irritations for dates prior to the epoch.我依稀记得对时代之前的日期的一些操作系统级别的刺激。 This may fail for you on the world's most commonly used OS but that is not really R's fault...在世界上最常用的操作系统上,这对您来说可能会失败,但这并不是 R 的错......
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