Final answer:
To convert the time between 1pm and 12am to international 24-hour format, add 12 to the hour portion of the time if it is PM, starting with 1300 for 1pm, and remember that midnight is 0000 hours. Adjust for the relevant time zone's difference from UTC when necessary.
Step-by-step explanation:
An easy way to find the equivalent international time between 1pm (1300) and 12am (2400) is to add 12 to the 1 through 11 hour numbers for PM times. Since we use a 24-hour time format internationally, you would start at 1300 hours for 1pm and count up by increments of 100 for each hour that passes until you reach 2400 hours (i.e., 1pm is 1300, 2pm is 1400, and so on). However, 12 am (midnight) is represented as 0000 hours. Given that each time zone is 15 degrees wide and knowing the local time in relation to the UTC (Coordinated Universal Time) helps in converting times across different time zones.