as.date {survival} | R Documentation

## Coerce Data to Dates

### Description

Converts any of the following character forms to a Julian date: 8/31/56, 8-31-1956, 31 8 56, 083156, 31Aug56, or August 31 1956.

### Usage

    as.date(x, order = "mdy", ...)

### Arguments

`x` | input data vector.
`order` | if x is character, defines the order in which the terms are assumed to appear in a xx/xx/xx date. The default is month/day/year; any permutation of mdy is legal.
`...` | if x is character, then any other arguments from `mdy.date()` can be used as well.

### Details

If `x` is numeric, then `floor(x)` is returned, e.g., `as.date(35)` is the same as `as.date(35.2)` and gives `Feb 2, 1960`. If `x` is character, the program attempts to parse it.

### Value

For each date, the number of days between it and January 1, 1960. The date will be missing if the string is not interpretable.

### See Also

`mdy.date`, `date.mmddyy`, `date.ddmmmyy`

### Examples

    as.date(c("1jan1960", "2jan1960", "31mar1960", "30jul1960"))

[Package survival version 2.18 Index]