CET is Central European Time - normally GMT+1.
Handy link: The World Clock - Time Zones
The High - Low is referring to the Price-high and Price-Low that occurred between these times.
CET = "Central European Time", i.e. what you see at the clock staples in, say, Rome, would you be there in its winter. This time zone is UTC+1. In summer, they use CEST = "Central European Summer Time", which is UTC+2.
US EST = "US Eastern Standard Time" is what you see at the clocks at your place in winter, which is UTC-5. In summer, you see US EDT = "US Eastern Daylight Time", which is UTC-4.
Winter starts in Europe on 28th October 2007, and in US on 4th November 2007.
All this is from Time - Current time around the World and standard time zones map of the world

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