Only integer numbers including exponent are converted, and ISO 8601 dates and times in their extended formats with separators. Anything else, like fractional numbers with decimal separators or dates other than ISO 8601, is not converted, as the text string would be locale dependent. Leading and trailing blanks are ignored.
変換された指数を含む整数値とセパレータを伴う ISO8601 拡張書式の日付と時間だけが変換されます。その他、小数点のある小数、ISO8601 形式以外の日付などは変換されません。先頭と末尾の空白は無視されます。