A

`date`

(Date) is a double vector. Its value represent the number of days since the Unix "epoch", 1970-01-01. It has no attributes.A

`datetime`

(POSIXct is a double vector. Its value represents the number of seconds since the Unix "Epoch", 1970-01-01. It has a single attribute: the timezone (`tzone`

))A

`duration`

(difftime)

## Usage

```
new_date(x = double())
new_datetime(x = double(), tzone = "")
new_duration(x = double(), units = c("secs", "mins", "hours", "days", "weeks"))
# S3 method for Date
vec_ptype2(x, y, ...)
# S3 method for POSIXct
vec_ptype2(x, y, ...)
# S3 method for POSIXlt
vec_ptype2(x, y, ...)
# S3 method for difftime
vec_ptype2(x, y, ...)
# S3 method for Date
vec_cast(x, to, ...)
# S3 method for POSIXct
vec_cast(x, to, ...)
# S3 method for POSIXlt
vec_cast(x, to, ...)
# S3 method for difftime
vec_cast(x, to, ...)
# S3 method for Date
vec_arith(op, x, y, ...)
# S3 method for POSIXct
vec_arith(op, x, y, ...)
# S3 method for POSIXlt
vec_arith(op, x, y, ...)
# S3 method for difftime
vec_arith(op, x, y, ...)
```

## Arguments

- x
A double vector representing the number of days since UNIX epoch for

`new_date()`

, number of seconds since UNIX epoch for`new_datetime()`

, and number of`units`

for`new_duration()`

.- tzone
Time zone. A character vector of length 1. Either

`""`

for the local time zone, or a value from`OlsonNames()`

- units
Units of duration.