找出R中一个月的天数 [英] Find out the number of days of a month in R
本文介绍了找出R中一个月的天数的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有一个日期在P
date = as.Date("2011-02-23", "%Y-%m-%d")
是否可以找出当月的天数那个特定日期? (关于leapyears)。在PHP中,它看起来与此类似( http://www.php.net/ manual / en / function.date.php ):
Is it possible to find out the number of days of the month of that particular date? (With respect to leapyears). In PHP it would look similar to this (http://www.php.net/manual/en/function.date.php):
days = format(date, "%t")
但%t似乎在R中有不同的含义。有没有解决这个问题?
but "%t" seems to have a different meaning in R. Is there a solution for this problem?
推荐答案
您可以编写简单的功能:
You can write simple function to do that:
numberOfDays <- function(date) {
m <- format(date, format="%m")
while (format(date, format="%m") == m) {
date <- date + 1
}
return(as.integer(format(date - 1, format="%d")))
}
调用为:
> date = as.Date("2011-02-23", "%Y-%m-%d")
> numberOfDays(date)
[1] 28
> date # date is unchanged
[1] "2011-02-23"
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