Phosphatase which catalyzes the conversion of NADP(+) to NAD(+) and of NADPH to NADH (By similarity). Shows a small preference for NADPH over NADP(+) (By similarity). Component of the circadian clock or downstream effector of clock function (PubMed:12573214). Exhibits a high amplitude circadian rhythm with maximal levels in early evening (PubMed:12573214). In constant darkness or constant light, the amplitude of the rhythm decreases (PubMed:12573214). {By
SimilarityUniProtKB:Q9UK39, Experimental EvidencePubMed:12573214}.