Reserve Bank of India has advised people to surrender all pre-2005 currency notes before 1 January 2015. These includes all currency notes.
Post-2005 notes  have the year of printing on the reverse side of the note, while the pre- 2005 do not have the same. It is easy to find out.
Better exchange the pre- 2005 notes within the stipulated time.
Already the Reserve Bank has shedded 144.66 crore such notes with a value of about Rs. 52,855 crore.