Added "time" part option to datePart function.

git-svn-id: http://google-refine.googlecode.com/svn/trunk@448 7d457c2a-affb-35e4-300a-418c747d4874

src/main/java/com/metaweb/gridworks/expr/functions/date/DatePart.java

@@ -56,6 +56,9 @@ public class DatePart implements Function {
             
             return s_daysOfWeek[r];
             
+        } else if ("time".equals(part)) {
+            return c.getTimeInMillis();
+            
         } else {
             return new EvalError("Date unit '" + part + "' not recognized.");
         }