World time zones worksheet with a table of cities and their UTC time zones, designed for educational use.

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🔹 Understanding the Table

The table shows various locations and their time differences from UTC (Coordinated Universal Time), which is the same as GMT (Greenwich Mean Time).

| City or Country | Time Zone (UTC) | Other Locations |
|------------------|------------------|------------------|
| Hawaii | UTC – 10 hours | |
| Los Angeles, USA | UTC – 8 hours | |
| Guatemala | UTC – 6 hours | |
| New York, USA | UTC – 5 hours | |
| Saint Lucia | UTC – 4 hours | |
| Argentina | UTC – 3 hours | |
| England | UTC | |
| France | UTC + 1 hour | |
| Madagascar | UTC + 2 hours | |
| Nairobi | UTC + 3 hours | |
| Thailand | UTC + 7 hours | |
| China | UTC + 8 hours | |
| Japan | UTC + 9 hours | |
| Sydney, Australia| UTC + 10 hours | |

> Note: When a location is behind UTC (e.g., UTC – 5), it's earlier than UTC. When ahead (e.g., UTC + 1), it's later.

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## ✔ Answering the Questions

1. If the time is 10:30am in England, what time is it in Sydney?

- England = UTC
- Sydney = UTC + 10 hours
- So, add 10 hours to 10:30am → 8:30pm

✔ Answer: 8:30pm

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2. It’s 2:30pm in Hawaii, what time is it in Saint Lucia?

- Hawaii = UTC – 10
- Saint Lucia = UTC – 4
- Difference: (-4) - (-10) = +6 hours → Saint Lucia is 6 hours ahead of Hawaii
- Add 6 hours to 2:30pm → 8:30pm

✔ Answer: 8:30pm

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3. It’s 5:00pm in Guatemala, what time is it in France?

- Guatemala = UTC – 6
- France = UTC + 1
- Difference: (+1) - (-6) = +7 hours → France is 7 hours ahead
- Add 7 hours to 5:00pm → 12:00am (midnight)

✔ Answer: 12:00am (midnight)

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4. It’s midnight in Greece, what time is it in New York?

- Greece = UTC + 1 (same as France)
- New York = UTC – 5
- Difference: (-5) - (+1) = -6 → New York is 6 hours behind
- Subtract 6 hours from midnight (12:00am) → 6:00pm (previous day)

✔ Answer: 6:00pm (the previous day)

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5. It’s 8:30pm in France, what time is it in China?

- France = UTC + 1
- China = UTC + 8
- Difference: (+8) - (+1) = +7 → China is 7 hours ahead
- Add 7 hours to 8:30pm → 3:30am (next day)

✔ Answer: 3:30am (next day)

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6. It’s 11:00am in Argentina, what time is it in Pakistan?

- Argentina = UTC – 3
- Pakistan = UTC + 5 (not listed, but standard time zone for Pakistan is UTC+5)
- Difference: (+5) - (-3) = +8 → Pakistan is 8 hours ahead
- Add 8 hours to 11:00am → 7:00pm

✔ Answer: 7:00pm

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7. It’s 1:37pm in Fiji, what time is it in Los Angeles?

- Fiji = UTC + 12 (not listed, but standard for Fiji)
- Los Angeles = UTC – 8
- Difference: (-8) - (+12) = -20 → Los Angeles is 20 hours behind
- Subtract 20 hours from 1:37pm:
- 1:37pm minus 12 hours = 1:37am (same day)
- Minus another 8 hours = 5:37pm (previous day)

✔ Answer: 5:37pm (the previous day)

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## ✔ Challenge Questions

1. How many lines of longitude are there in total?

- There are 360 degrees around the Earth.
- Each degree represents one line of longitude.
- So, there are 360 lines of longitude, spaced every 1 degree.

✔ Answer: 360 lines

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2. Which country has the most time zones and how many does it span?

- Russia has the most time zones — 11 time zones.
- It spans from UTC+2 (Kaliningrad) to UTC+12 (Kamchatka).
- (Note: Some sources say 11; others say 12 depending on inclusion of Kaliningrad.)

✔ Answer: Russia, 11 time zones

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3. What is the International Date Line?

- The International Date Line is an imaginary line that runs roughly along the 180° longitude.
- It marks the boundary where one calendar day ends and another begins.
- When you cross it going east, you subtract one day.
- When you cross it going west, you add one day.

✔ Answer: It’s an imaginary line at 180° longitude that separates two consecutive calendar days.

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4. Name three countries that observe Daylight Saving Time and find out why they do this.

- Examples:
1. United States – To save energy and make better use of daylight during summer months.
2. United Kingdom – Similar reason: longer evenings in summer, saving energy.
3. Canada – Most provinces observe DST to align with U.S. schedules and extend daylight.

> Why? Daylight Saving Time shifts clocks forward in spring and back in fall to make better use of natural daylight, reduce energy use, and provide more daylight in the evening.

✔ Answer: Example countries: USA, UK, Canada. Reason: To maximize daylight in the evening and save energy.

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5. What time zone does the International Space Station use?

- The ISS uses Coordinated Universal Time (UTC).
- This helps astronauts and mission control communicate across different countries without confusion.

✔ Answer: UTC (Coordinated Universal Time)

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## ✔ Final Summary Answers:

| Question | Answer |
|--------|--------|
| 1. England 10:30am → Sydney | 8:30pm |
| 2. Hawaii 2:30pm → Saint Lucia | 8:30pm |
| 3. Guatemala 5:00pm → France | 12:00am (midnight) |
| 4. Greece midnight → New York | 6:00pm (previous day) |
| 5. France 8:30pm → China | 3:30am (next day) |
| 6. Argentina 11:00am → Pakistan | 7:00pm |
| 7. Fiji 1:37pm → Los Angeles | 5:37pm (previous day) |
| Challenge 1 | 360 lines of longitude |
| Challenge 2 | Russia, 11 time zones |
| Challenge 3 | Imaginary line at 180° longitude marking the start/end of a calendar day |
| Challenge 4 | USA, UK, Canada – to save energy and extend daylight |
| Challenge 5 | UTC (Coordinated Universal Time) |

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