Illinois is two hours ahead of California.
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The time in Chicago is one hour behind New York.
The time difference between Pretoria, Africa and Chicago, Illinois is 8 hours. Pretoria is 8 hours ahead of Chicago.
The time difference between Chicago, Illinois and Rio de Janeiro, Brazil is two hours. Rio de Janeiro is two hours ahead of Chicago.
There is no time difference between Arkansas and Illinois.
Philadelphia and New York are in the same time zone, Eastern Standard Time (EST) or Eastern Daylight Time (EDT) depending on the season. There is no time difference between the two cities.