1. Take the number representing the hours: 4.
2. Add 12 since it's afternoon (also known as "pm"). In Spanish, afternoon and evening times are expressed by adding "de la tarde" or "de la noche" after the time, but the clock itself is still based on a 24-hour format.
3. So, 4:30 pm becomes 16:30 (4 + 12).
4. In Spanish, time is usually expressed using the 24-hour format without the leading zeros, so 16:30 becomes dieciséis treinta.
5. If you prefer, you can also say las cuatro y media de la tarde (literally, "the four and a half of the afternoon").
Therefore, 4:30 pm in Spanish is dieciséis treinta or las cuatro y media de la tarde.