18:30 is typically considered to be 6:30 PM. However, there can be some variation in what time this is, depending on the specific context. For example, if someone tells you they will meet you at 1830 hours, they are likely referring to 6:30 PM. But if someone tells you their flight leaves at 1830, they are probably referring to 18:30, or 6:30 PM. In general, though, 1830 is typically taken to mean 6:30 PM. So if you’re trying to figure out what time it is and someone tells you it’s 1830, that’s an excellent place to start.