title: Day of the Week, Month, Year, Week of the Year in R
body: <p>Are there any built on functions that can be used on a data frame object to generate variables on a class <code>Date</code> time series to create day of the Week, Month, Year, Week of the Year, etc in R?</p>
  
  <p>The <code>weekdays</code>, <code>months</code>, <code>quarters</code>, functions in the base package generate text output, looking for numerical output to denote that 3/5/2012, for example, is a Friday, 3rd day of the month, 1 week of the month, and the 63 day of the year, etc. </p>