Dates and Times
Ruby has three separate classes to represent date and time data: Time, Date, and DateTime.
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Time represents a specific moment in time, and you can retrieve both date and time information based on that. The Time class is based on a library that is common to Unix systems and is used by many programming languages.
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Date represents a date only with no time information attached. It’s useful for calendar arithmetic that doesn’t depend on the time of day. You need require "date" to use the Date class.
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DateTime also represents a specific moment in time but uses a different internal representation than Time. DateTime is now considered deprecated—at one point it had a more complete API than Time, but that is no longer true. Currently, ...
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