Enables RNA polymerase II-specific DNA-binding transcription factor binding activity. Involved in negative regulation of dauer larval development; negative regulation of miRNA transcription; and regulation of development, heterochronic. Located in cytoplasm and nucleus. Expressed in head;
hyp7 syncytium; and pharyngeal muscle cell. Human ortholog(s) of this gene implicated in advanced sleep phase syndrome 1 and cocaine dependence. Is an ortholog of human PER1 (period circadian regulator 1) and PER2 (period circadian regulator 2).