Defense forces and transport companies commonly use 24-hour time. 24-hour time avoids confusion when communicating estimated times of arrival (ETAs) or scheduling events like tide changes. Using a 24-hour clock is clearer than a 12-hour clock with AM/PM designations, especially for activities like travel or fishing that can occur across day and night periods.

1. Who uses
24 hour time ?
Wilson, B. (2011). Time introduction to 24 hour time. Retrieved from
http://slidesha.re/1bA2CH7
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2. Who uses 24 hour time ?
• Defence forces
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3. ETA means Estimated Time of Arrival
Unit 4 – report ETA at base camp
ETA at base camp is 14:30 hours
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4. Who would use 24 hr time ?
Transport
companies
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5. Communicating and
understanding
• With your travel partner look at the
next two slides and talk about what has
happened…..
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6. The tide is good for fishing at
tomorrow.
7 o’clock
I’ll pack a torch !
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7. The tide is good for fishing at 0700
tomorrow.
Great- early in the day
is the best time !
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8. Using 24 Hour time stops confusion !
Look back at the slides showing who uses 24 hour time….
Discuss: Why is that the best way of communicating time for them ?
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9. Where do you see 24 hr time ?
Tide times
in the newspaper.
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10. Tide times
Think about how the tides go in and out all day every day, never
stopping. The times for high tides and low tides change everyday.
Lots of people plan to go fishing at the best times – the best times are
at the change of the tide. The change of tides can happen during the
day or during the night.
Question Why do you think it is a good idea to have the
times written in 24 hour time ?
Answer Using 24 hour time is a good way to show the tide
times because ….
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11. Where do you see 24 hr time ?
Travel timetables – eg buses, planes, trains
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