Pl. clarify if an employee can avail F.R.22(1)(a)(1) after promotion on 1st of Jan

Please clarify whether a Central Govt employee can avail the benefit of pay fixation under FR 22 1 (a) 1 after being promoted on 1 st of January and opted to get his pay fixed on the date of next increment which happens to be 1st of July of same year.pls illustrates with an examples and relevant office order/ circulars may pls be provided.