思い立ったが吉日（おもいたったがきちじつ）
Japanese vocabulary
Meaning: the best time for doing something is as soon as you've thought of it; there's no time like the present; it's an auspicious day (for doing it) when you've just had the idea
Japanese vocabulary
Meaning: the best time for doing something is as soon as you've thought of it; there's no time like the present; it's an auspicious day (for doing it) when you've just had the idea