The time differences between countries are due to the rotation of the Earth as it orbits the Sun. Supposing Krisnan gets up at 7 a.m., Hirani could phone him from 7 a.m. is the middle of the night, so Hirani can’t phone Krisnan then. New Zealand time: subtract 61/2 hours to get 3 p.m. New Zealand time: subtract 61/2 hours to get 12.30 a.m. This time, the students will have to subtract the time difference because they are going from New Zealand time to another country’s time.ħ a.m. The students could work out what time in each country Hirani is awake. Hirani’s bedtime means that she cannot call Keyoko, Krisnan, and Andrew at 7 p.m. Using a 24 hour clock, you could calculate this as 1900 + 1200 = 3100, which is 700.īrad in Texas is 18 hours behind New Zealand, so Hirani will have to add 18 hours on to 7 p.m. is 7 a.m., so Hirani will phone Kirsty at 7 a.m. Scotland is 12 hours behind New Zealand, so Hirani will have to add 12 hours on to 7 p.m. (or 1900 on a 24 hour clock) Scotland time. In non-daylight saving time, the differences are: This means other countries are another hour behind us, assuming that they are not also on daylight If New Zealand is in daylight saving time, our clocks are put forward by one hour. (As an extension, you could ask the students to do the problem again, this time with daylight saving. It is easiest to do the problem without taking daylight saving into account. Have an analogue clock available for them to use to count the hours. In this activity, the students apply rules in a practical situation.
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