Advanced UTC Time Zones

Name:

Date:

🌍 Part 1: UTC Reasoning

WALT: We Are Learning To use UTC offsets to calculate times in different locations.

Success criteria: I can add or subtract a UTC offset, use the 24-hour clock and identify when a calculation crosses midnight.

Dyslexia-friendly option: Read each question aloud, cover the other questions, and use a place-value chart for the hours and minutes.

1. Sydney is UTC+10. If the UTC time is 14:30, what time is it in Sydney?

00:30 on the same day

00:30 on the next day

04:30 on the next day

24:30 on the same day

2. Los Angeles is UTC−8. If the UTC time is 22:45, what time is it in Los Angeles?

06:45 on the next day

14:45 on the same day

16:45 on the same day

00:45 on the next day

3. Which location is 5 hours and 45 minutes ahead of UTC?

Kathmandu

Nairobi

Perth

Los Angeles

4. A flight leaves at 23:20 UTC and takes 7 hours 45 minutes. What is its arrival time in UTC?

06:05 on the same day

07:05 on the next day

07:15 on the next day

31:05 on the same day

✏️ Part 2: Calculate and Explain

5. On 15/06/2025, the UTC time is 16:40. Melbourne is UTC+10. Write the local date and time in Melbourne. Show your working.

6. Nairobi is UTC+3 and Auckland is UTC+12. If it is 21:15 in Nairobi, what time and date is it in Auckland? How many hours ahead is Auckland?

7. Brisbane is UTC+10 and Perth is UTC+8. A video call starts at 19:30 in Brisbane. What time does it start in Perth? Explain the operation you used.

8. A message is sent at 23:50 UTC on 31/08/2025. A reply arrives at 01:25 UTC on 01/09/2025. How long did the reply take to arrive?

🚀 Part 3: Apply Your Thinking

9. At 09:00 UTC, calculate the local time in each location.

Perth UTC+8: ____________ Sydney UTC+10: ____________ Kathmandu UTC+5:45: ____________

Which location has the earliest local time? Explain how you know.

10. You are organising an online maths meeting for students in Perth (UTC+8), Sydney (UTC+10) and Auckland (UTC+12). The meeting must be between 08:00 and 20:00 local time for everyone. Choose a suitable UTC start time and prove that it works for all three locations.

Differentiation: If you need support, use a 24-hour timeline, write the UTC offset as an addition or subtraction sentence, and calculate the hours before the minutes. A partner may read the questions aloud.

Extension for advanced learners: Find two different UTC start times that meet the conditions in Question 10. Which time gives the greatest overlap for all three locations? Justify your answer.