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有 2 个文本框供用户输入时间。如何使用格式（小时：分钟：秒）获得两次之间的差异
我想你会从那个链接中得到这个想法。
http://office.microsoft.com/en-in/excel-help/calculate-the-difference-between-two-times-HP010070468.aspx
http://office.microsoft.com/en-in/excel-help/calculate-the-difference-between-two-times-HP003056108.aspx