removeEarlyDates: removeEarlyDates removes dates before a specified year
Description
Dates before a specified year are set to NA. This is often used for dates
formed from malformed character representations such as a date in
%m-%d-%Y format being read by %Y-%m-%d format
Usage
removeEarlyDates(dates, firstYear)
Value
A vector of dates after the year indicated by the numeric value of
firstYear.
Arguments
dates
vector of dates
firstYear
integer value of first (earliest) year in the allowed
date range.