datetime包含有用的日期和时间处理函数。
Datetime contains useful date and time manipulation functions.
应用程序开发人员会很喜欢新的标量函数，尤其是日期和时间函数，它们会提高处理性能。
Your application developers will like the new scalar functions, especially the date and time functions that will provide performance boosts for processing.
除了可以转换日期和时间格式外，JSF还提供了处理像百分数或者货币数据这类值的特殊转换器。
In addition to allowing you to convert date and time formats, JSF provides a special converter for dealing with Numbers such as percentages or currency.
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