These one's are undated, and were issued 1930 to 1943.
The easiest way to tell Japanese coins and notes from those of similar age and appearance from China or Korea is the circular, flower-like thing you can see on the top centre of the front of the note (top picture). That's the Imperial Chrysanthemum, the badge and symbol of the Emperor and it appears on all coins and notes issued by Japan up to the end of WWII; it's still used sometimes in postwar Japan, particularly for coins commemorating royal events (births, weddings etc).
Notes issued by Japan for it's puppet states in the occupied colonies in East Asia sometimes have a similar-looking seal, but the 16-lobed chrysanthemum flower is used only on coins and notes for Japan proper and the Japanese military.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis