Compares two origin entry groups, based on the dates of their creation
Parameters: c1 - the first origin entry group to compare Parameters: c2 - you can't really compare without two origin groups 0 if the creation dates are equal, a negative number if c1's creation date is lessthan c2's; a positive number otherwise See Also:java.util.Comparator.compare(java.lang.Objectjava.lang.Object)