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The Ruby Way: Solutions and Techniques in Ruby Programming, Third Edition by André Arko, Hal Fulton

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Chapter 7. Working with Times and Dates

Does anybody really know what time it is?

—Chicago, Chicago IV

One of the most complex and confusing areas of human life is that of measuring time. To come to a complete understanding of the subject, you would need to study physics, astronomy, history, law, business, and religion. Astronomers know (as most of us don’t!) that solar time and sidereal time are not quite the same thing, and why a “leap second” is occasionally added to the end of the year. Historians know that the calendar skipped several days in October 1582, when Italy converted from the Julian calendar to the Gregorian. Few people know the difference between astronomical Easter and ecclesiastical Easter (which are almost always the same). ...

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