International Time Zones 2

Years

Year 11

Working with Time

International Time Zones

International Time Zones 2

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Question 1 of 5

Find the local time in Melbourne given the following:

Melbourne

(+ 10)

$(+10)$

New York

(- 5) 6

$(-5) 6$ pm Monday

1. $09 : 00$ $09:00$ am Tuesday
2. $10 : 30$ $10:30$ pm Sunday
3. $09 : 00$ $09:00$ am Monday
4. $05 : 40$ $05:40$ pm Monday

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Standard time zones divide the Earth in

15 °

$15°$ regions which means each zone has a

1

$1$ -hour difference

The Prime Meridian’s time zone is

0

$0$

Finding the Time Difference

- 1

$-1$ time zone

= 1

$=1$ hour of time difference to the west (West = lest)

+ 1

$+1$ time zone

= 1

$=1$ hour of time difference to the east (East = beast)

First, draw a rectangle with the Prime Meridian and the two time zones

Since the time zones have different signs, the Prime Meridian should be drawn in the middle

The prime meridian is also called Greenwich Mean Time (GMT) or Coordinated Universal Time (UTC)

Draw a line that connects the two time zones

This represents a plus sign, which means we must get the sum of the two time zones

We find the sum because both cities are on either side of

U T C

$UTC$

Make sure to add them as both positive numbers

10 + 5

$10+5$

=

$=$

15

$15$ hours

Since Melbourne is to the east of New York, add

15

$15$ hours to

6

$6$ pm

	$6$ $6$ pm $+ 15$ $+15$ hours
$=$ $=$	$18 : 00 + 15$ $18:00+15$ hours	Convert $6$ $6$ pm to military time by adding $12$ $12$
$=$ $=$	$18 ° + 15 °$ $18°+15°$	press the DMS button on the calculator for every $°$ $°$
$=$ $=$	$33 °$ $33°$

Since the answer is greater than

24

$24$ , it means the time we are looking for occurs the day after which is Tuesday

Simply subtract

24

$24$ hours to get a proper time format

		$33 ° - 24 °$ $33°-24°$
	$=$ $=$	$9 °$ $9°$
	$=$ $=$	$09 : 00$ $09:00$ am

The time in Melbourne is $09 : 00$ $09:00$ am Tuesday

09 : 00

$09:00$ am Tuesday

Question 2 of 5

2. Question
Find the local time in New Delhi given the following:

New Delhi $(+ 5 \frac{1}{2})$ $(+5 1/2)$

Johannesburg $(+ 2) 9$ $(+2) 9$ am Friday
- 1. $11 : 30$ $11:30$ pm Thursday
- 2. $10 : 00$ $10:00$ am Saturday
- 3. $2:30$ pm Friday
- 4. $12:30$ pm Friday
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Standard time zones divide the Earth in $15°$ regions which means each zone has a $1$ -hour difference

The Prime Meridian’s time zone is $0$

Finding the Time Difference

$-1$ time zone $=1$ hour of time difference to the west (West = lest)

$+1$ time zone $=1$ hour of time difference to the east (East = beast)

First, draw a rectangle with the Prime Meridian and the two time zones

Since the both time zones are positive, the Prime Meridian should be drawn first

The prime meridian is also called Greenwich Mean Time (GMT) or Coordinated Universal Time (UTC)

Draw a line that connects the two time zones

This line represents a minus sign, which means we must get the difference between the two time zones

We find the difference because both cities are on one side of $UTC$

$5 1/2-2$ $=$ $3 1/2$ hours

Since New Delhi is to the east of Johannesburg, add $3 1/2$ hours to $9$ am

$9$ am $+3 1/2$ hours

$=$ $09:00+3 1/2$ hours

$=$ $12:30$ pm

The time in New Delhi is $12:30$ pm Friday

$12:30$ pm Friday
Question 3 of 5

3. Question
Find the local time in Honolulu given the following:

Honolulu $(-10)$

Sydney $(+10) 6$ am Friday
- 1. $10:00$ am Thursday
- 2. $10:00$ am Saturday
- 3. $05:30$ pm Friday
- 4. $6:00$ am Thursday
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Standard time zones divide the Earth in $15°$ regions which means each zone has a $1$ -hour difference

The Prime Meridian’s time zone is $0$

Finding the Time Difference

$-1$ time zone $=1$ hour of time difference to the west (West = lest)

$+1$ time zone $=1$ hour of time difference to the east (East = beast)

First, draw a rectangle with the Prime Meridian and the two time zones

Since the time zones have different signs, the Prime Meridian should be drawn in the middle

The prime meridian is also called Greenwich Mean Time (GMT) or Coordinated Universal Time (UTC)

Draw a line that connects the two time zones

This represents a plus sign, which means we must get the sum of the two time zones

We find the sum because both cities are on either side of $UTC$

Make sure to add them as both positive numbers

$10+10$ $=$ $20$ hours

Since Honolulu is to the west of Sydney, subtract $20$ hours from $6$ am

$6$ am $-20$ hours

$=$ $0600-20$ hours

$=$ $6°-20°$ press the DMS button on the calculator for every $°$

$=$ $-14°$

Since the answer is negative, it means the time we are looking for occurs the day before which is Thursday

Simply add $24$ hours to get a proper time format

$-14°+24°$

$=$ $10°$

$=$ $10:00$ am

The time in Honolulu is $10:00$ am Thursday

$10:00$ am Thursday

Question 4 of 5

Find the local time in Miami given the following:

Miami

$(-5)$

Madrid

$(+2) 5$ pm Saturday

1. $10:00$ am Saturday
2. $8:00$ am Sunday
3. $10:00$ pm Saturday
4. $5:00$ am Saturday

Question 5 of 5

5. Question
Joshua is in Perth and wants to call his dad who is in Sydney at $6:30$ pm, Sydney time. What time must he call from Perth? Use the following time zones

Perth $(+8)$

Sydney $(+10)$
- 1. $4:30$ pm
- 2. $5:00$ pm
- 3. $3:00$ pm
- 4. $8:30$ pm
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Standard time zones divide the Earth in $15°$ regions which means each zone has a $1$ -hour difference

The Prime Meridian’s time zone is $0$

Finding the Time Difference

$-1$ time zone $=1$ hour of time difference to the west (West = lest)

$+1$ time zone $=1$ hour of time difference to the east (East = beast)

First, draw a rectangle with the Prime Meridian and the two time zones

Since the both time zones are positive, the Prime Meridian should be drawn first

The prime meridian is also called Greenwich Mean Time (GMT) or Coordinated Universal Time (UTC)

Draw a line that connects the two time zones

This line represents a minus sign, which means we must get the difference between the two time zones

We find the difference because both cities are on one side of $UTC$

$10-8$ $=$ $2$ hours

Since Perth is to the west of Sydney, subtract $2$ hours from $6:30$ pm

$6:30$ pm $-2$ hours

$=$ $4:30$ pm

Since Joshua is in Perth, he must make the call at $4:30$ pm so his dad will receive the call at $6:30$ pm Sydney time.

$4:30$ pm

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Quiz summary

Information

1. Question

Hint

Nice Job!

Finding the Time Difference

2. Question

Hint

Well Done!

Finding the Time Difference

3. Question

Hint

Correct!

Finding the Time Difference

4. Question

Hint

Fantastic!

Finding the Time Difference

5. Question

Hint

Nice Job!

Finding the Time Difference

Quizzes

	$6$ am $-20$ hours
$=$	$0600-20$ hours
$=$	$6°-20°$	press the DMS button on the calculator for every $°$
$=$	$-14°$

	$5$ pm $-7$ hours
$=$	$17:00-7$ hours	Convert $6$ pm to military time by adding $12$
$=$	$17°-7°$	press the DMS button on the calculator for every $°$
$=$	$10°$
$=$	$10:00$ am

		$9$ am $+3 1/2$ hours
	$=$	$09:00+3 1/2$ hours
	$=$	$12:30$ pm

		$6:30$ pm $-2$ hours
	$=$	$4:30$ pm