Final answer:
To write 7:18pm in international time, add 12 hours to convert it into a 24-hour format, becoming 19:18.
Step-by-step explanation:
To convert 7:18pm to international time, also known as military time or the 24-hour clock, you add 12 hours to the time if it is after noon. Since 'pm' indicates the time is after noon, we add 12 hours to 7:18 to convert it. Therefore, 7:18pm becomes 19:18 in international time.