R: Convert dates encoded as serial numbers to Date class.

excel_numeric_to_date {janitor} | R Documentation

## Convert dates encoded as serial numbers to Date class.

### Description

Converts numbers like `42370` into date values like `2016-01-01`.

Defaults to the modern Excel date encoding system. However, Excel for Mac 2008 and earlier Mac versions of Excel used a different date system. To determine what platform to specify: if the date 2016-01-01 is represented by the number 42370 in your spreadsheet, it's the modern system. If it's 40908, it's the old Mac system. More on date encoding systems at http://support.office.com/en-us/article/Date-calculations-in-Excel-e7fe7167-48a9-4b96-bb53-5612a800b487.

### Usage

    excel_numeric_to_date(date_num, date_system = "modern")

### Arguments

`date_num` | numeric vector of serial numbers to convert.
`date_system` | the date system, either `"modern"` or `"mac pre-2011"`.

### Value

Returns a vector of class Date.

### Examples

    excel_numeric_to_date(40000)

[Package janitor version 1.0.0 Index]