Although there is no clear definition as to which periods qualify as jidaigeki, those based on periods up to the Meiji Restoration are often referred to as such.
どこまでの時代を扱った作品が「時代劇」と呼ばれるかに明確な定義はないが、明治維新までを扱った作品がそう呼ばれることが多い。