舍入日期时间

在 R 中处理日期和时间

Charlotte Wickham

Instructor

舍入 vs. 提取

release_time <- releases$datetime
head(release_time)

"1997-12-04 08:47:58 UTC" "1997-12-21 13:09:22 UTC"
"1998-01-10 00:31:55 UTC" "1998-03-14 19:25:55 UTC"
"1998-05-02 07:58:17 UTC" "1998-06-14 12:56:20 UTC"

head(release_time) %>% hour()

8 13  0 19  7 12

head(release_time) %>% floor_date(unit = "hour")

"1997-12-04 08:00:00 UTC" "1997-12-21 13:00:00 UTC"
"1998-01-10 00:00:00 UTC" "1998-03-14 19:00:00 UTC"
"1998-05-02 07:00:00 UTC" "1998-06-14 12:00:00 UTC"

lubridate 中的舍入

round_date() - 舍入到最近的
ceiling_date() - 向上取整
floor_date() - 向下取整
unit 的可选值：
- "second", "minute", "hour", "day", "week", "month", "bimonth", "quarter", "halfyear", 或 "year"。
- 或倍数，如 "2 years", "5 minutes"

Let's practice!

在 R 中处理日期和时间