Involved in the regulation of flowering time under short day (SD) and long day (LD) conditions. Functions as floral promoter by negatively regulating GHD7, a repressor of the photoperiodic control of flowering (PubMed:22399582, PubMed:22422935, PubMed:22912900). Acts as floral activator in the LD photoperiodic pathway (PubMed:22888152). Involved in blue light-induced activation of EHD1 expression to promote flowering under SD conditions (PubMed:22912900). Expressed in mesophyll cells of young leaves, anthers, stigmas and the top of lemmas. Circadian-regulation under short day (SD) conditions. Expression increases after midnight, peaks just at dawn and gradually decreases during the daytime. Late flowering phenotype under short day (SD) and long day (LD) conditions.