get_date: Convert timestamp to Date
Description
Helper function to convert a timestamp from openretractions.com into a date.
Usage
get_date(x, database = "or")
Arguments
x
Numeric or Character. Numeric timestamp from openretractions.com or character from retractiondatabase.com
database
Character. Abbreviation of the database (either or for openretractions.com, or rw for retractiondatabase.com)