title: Get the number of days, weeks, and months, since Epoch in Java
body: <p>I'm trying to get the number of days, weeks, months since Epoch in Java. </p>
  
  <p>The Java Calendar class offers things like calendar.get(GregorianCalendar.DAY_OF_YEAR), or Calendar.get(GregorianCalendar.WEEK_OF_YEAR), which is a good start but it doesn't do exactly what I need.</p>
  
  <p>Is there an elegant way to do this in Java?</p>