在 R 中处理日期和时间
Charlotte Wickham
Instructor
Date 对象按自 1970-01-01 起的天数存储
Date
as.Date("2003-02-27") > as.Date("2002-02-27")
TRUE
as.Date("2003-02-27") + 1
"2003-02-28"
as.Date("2003-02-27") - as.Date("2002-02-27")
相差 365 天
x <- c(as.Date("2003-02-27"), as.Date("2003-03-27"), as.Date("2003-04-27")) plot(x, 1:3)
x <- c(as.Date("2003-02-27"), as.Date("2003-03-27"), as.Date("2003-04-27")) library(ggplot2) ggplot() + geom_point(aes(x = x, y = 1:3))
releases
# A tibble: 105 x 7 major minor patch date datetime time type <int> <int> <int> <date> <dttm> <time> <chr> 1 0 60 NA 1997-12-04 1997-12-04 08:47:58 08:47:58 patch 2 0 61 NA 1997-12-21 1997-12-21 13:09:22 13:09:22 minor 3 0 61 1 1998-01-10 1998-01-10 00:31:55 00:31:55 patch 4 0 61 2 1998-03-14 1998-03-14 19:25:55 19:25:55 patch 5 0 61 3 1998-05-02 1998-05-02 07:58:17 07:58:17 patch 6 0 62 NA 1998-06-14 1998-06-14 12:56:20 12:56:20 minor 7 0 62 1 1998-06-14 1998-06-14 22:13:25 22:13:25 patch 8 0 62 2 1998-07-10 1998-07-10 11:13:45 11:13:45 patch 9 0 62 3 1998-08-28 1998-08-28 09:02:19 09:02:19 patch 10 0 62 4 1998-10-23 1998-10-23 12:08:41 12:08:41 patch # ... with 95 more rows
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