更新时间:2023-02-18 10:24:38
请注意,在日期之后, as.Date
将忽略垃圾,因此在我使用的不是特别快的笔记本电脑上,此操作不到10秒:
Note that as.Date
will ignore junk after the date so this takes less than 10 seconds on my not particularly fast laptop:
xx <- rep("10/17/2017 12:00:00 AM", 5000000) # test input
system.time(as.Date(xx, "%m/%d/%Y"))
## user system elapsed
## 9.57 0.20 9.82