Almost all airline tickets that are issued outside of the United States indicate departure times in the 24-hour clock.
Using the 24-hour clock avoids confusion and reduces errors on identifying AM and PM. The 24-hour clock is always portrayed in four digits, to include both hours and minutes. The cycle begins at one minute past midnight (0001), progressing through the day and ending at midnight (2400). Morning hours are easy to determine. For PM times, the simplest thing to do is add 1200 so they become the corresponding PM time.
To convert the 24-hour clock back to the 12-hour clock, just subtract 1200 from the PM time.
Internet Reference Site
To know more about time zone conversions discussed in the sections above, please visit:
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Concepts and TerminologyConfidential, TRX Inc.7 November 2007