Simplest way to extract date from timestamp

Question

Consider the following timestamp

timestamp <- ymd_hms("2011-08-10 14:00:00", tz = "Pacific/Auckland")

> timestamp
[1] "2011-08-10 14:00:00 NZST"

What is the simplest way to get the day part 2011-08-10 from it, and making sure this day is a proper date and not a string?

Using lubridate::day(timestamp) obviously fails here.

Answer 1

This would probably be the simplest way:

date(timestamp)

It will return a date class and not a string.

Answer 2

使用日期代替日期

lubridate::date(timestamp)

Answer 3

There is also data.table s as.IDate() function now:

timestamp <- "2011-08-10 14:00:00"
data.table::as.IDate(timestamp)