This article explores the different ways of expressing time in Japanese, such as "juppun" (十分) for 15 minutes, and how to tell time in Japanese using the 24-hour system or the 12-hour system. It also provides examples of other phrases used to express time in Japanese, such as “san jikan mae” (三時間前) and “ippun mae” (一分前). Understanding these phrases is important for anyone who wants to communicate effectively with native speakers of Japanese while traveling around Japan or engaging in conversations with them online or offline.