我们希望它返回一个整数，以表示从公元纪年到现在的秒数，但实际上得到的是按照ISO 8601格式化的字符串。

We might like it to be returned as an integer representing seconds since the Epoch, but in fact we are given a string formatted according to ISO 8601.

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传递给这个函式的整数索引表示要进行转换之项目的索引(从0开始)。

The integer index passed to the function indicates the index (from 0) of element being transformed.

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