Several tips ago we discussed time formats and expressions of time ranges. These were in 12-hour formats.
Sometimes 24-hour time formats are used, particularly in the travel and military industries.
For example, the Society of Petroleum Engineers uses 24-hour time expressions for all of its international events. The SPE Style Guide says that there should be four digits with no punctuation when using this format.
Use the word “hours” after the number when using a sentence, but not in a list of times.
BTW, 0600 hours is pronounced “oh-six-hundred” hours.
On work days, I set my alarm for 0600 hours. On weekends I turn the alarm off and let the daylight wake me.
Registration: 0700 to 0800 Breakfast: 0800 to 0830 Speaker: 0830 to 0900
The airport restaurants are closed 1100–0600. (Note the en-dash.)
No need to wonder if 12:00 means noon or midnight with this notation!
Trivia question: Is midnight in military time 0000 or 2400?
Answer: Both are used.
When carrying out operations in multiple time zones, the US military uses Zulu Time, with a Z after the 24-hour notation, to represent Greenwich Mean Time (GMT).
The tanks will enter the city at 1400Z (or 2:00 p.m. in Greenwich, England.)
Why do they call it “Zulu Time?”
The world is divided into 24 time zones, and each is given a letter of the alphabet. The time zone for Greenwich, England, was assigned the letter “Z,”
which is “Zed” in many parts of the world, but in the military alphabet, Z is “Zulu.”