USA Problem 1

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USA Problem 1
Denver
Chi
200pm 10/18
LA
Ath
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Rules for Time/Date

• 1. Heading East every 15 ? add an hour.
• 2. Heading West every 15 ? subtract an hour.

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USA Problem 2
Chi
Denver
130am 10/18
LA
Ath
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Rules for Time/Date

• 1. Heading East every 15 ? add an hour.
• 2. Heading West every 15 ? subtract an hour.
• 3. 12am or midnight changes the date.

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Date with IDL

• The date changes when crossing the IDL

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Rules for Time/Date

• 1. Heading East every 15 ? add an hour.
• 2. Heading West every 15 ? subtract an hour.
• 12am or midnight changes the date.
• Going West over the IDL ? add 1 day.
• 5. Going East over the IDL ? subtract 1 day.

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IDL Problem 1

• at 150 W 200pm on 10/18

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IDL Problem 2

• At 135 E 730pm on 4/14