Kindly clarify my doubts.

1. my pay is Rs.13180+4200/- as on 01-01-2016. It i opt my increment as on 01-01-2016, how fix my pay please indicate my fixation.

2. One who joined as LDC on 2-3-2015. His 1st increment sanctioned on 01-07-2016. In the revised pay which date is benefit to opt for his pay fixation. 01-01- 2016 or 01-07-2016?