如何将 m/d/y 和 mdy 中的日期转换为 R 中的单一格式

Question

activity$ActivityDate = as.POSIXct(activity$ActivityDate, format="%d/%m/%y", tz=Sys.timezone()) returns NA in ActivityDate and Date columns in R

activity$ActivityDate = as.POSIXct(activity$ActivityDate, format="%d/%m/%y", tz=Sys.timezone()) ends up with NA in ActivityDate column in R

Answer 1

I can only guess what you would like to achieve based on your question title - it would help if you could include a minimal reproducible example and some prose describing your problem.

It seems that lubridate 's parsing functions might do what you need:

ActivityDate <-  c("07/31/2022", "07-31-2022")
lubridate::mdy(ActivityDate)
#> [1] "2022-07-31" "2022-07-31"

^{Created on 2022-12-21 with reprex v2.0.2}