目次

# 文字列を数値に変換する

Defaults settings in Calc converts text inside cells to the respective numeric values if an unambiguous conversion is possible. If no conversion is possible, Calc returns a #VALUE! error.

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.

以下の ISO8601 形式が変換されます:

- CCYY-MM-DD

- CCYY-MM-DDThh:mm

- CCYY-MM-DDThh:mm:ss

- CCYY-MM-DDThh:mm:ss,s

- CCYY-MM-DDThh:mm:ss.s

- hh:mm

- hh:mm:ss

- hh:mm:ss,s

- hh:mm:ss.s

世紀コード CC は省略はできません。T 日付と時刻セパレータの代わりに 1 つの空白文字を使用することができます。

日付が与えらえるならば、それは有効なグレゴリオ暦日付でなければなりません。この場合、任意の時間が 00:00 から 23:59:59.99999... の間でなければなりません。

時間文字列だけが与えられた場合、それは 24 時間を超えるかもしれません。一方で分と秒は最大値が 59 となります。

The conversion is done for single scalar values only, not within ranges.

The conversion is done for single scalar values, as in =A1+A2, or ="1E2"+1. Cell range arguments are not affected, so SUM(A1:A2) differs from A1+A2 if at least one of the two cells contain a convertible string.

数式の中の文字列も変換されます。たとえば ="1999-11-22"+42 は 1999 年 11 月 22 日から 42 日後の日付を返します。地域化された日付文字列を含む数式はエラーを返します。たとえば "11/22/1999" や "22.11.1999" は自動変換できません。

When using functions where one or more arguments are search criteria strings that represents a regular expression, the first attempt is to convert the string criteria to numbers. For example, ".0" will convert to 0.0 and so on. If successful, the match will not be a regular expression match but a numeric match. However, when switching to a locale where the decimal separator is not the dot makes the regular expression conversion work. To force the evaluation of the regular expression instead of a numeric expression, use some expression that can not be misread as numeric, such as ".[0]" or ".\0" or "(?i).0".

## 例

In A1 enter the text '1e2 (which is converted to the number 100 internally).

In A2 enter =A1+1 (which correctly results in 101).

The formula =SUM(A1:A2), returns 101 instead of 201 because the conversion does not occur in a range, only for single scalar values. Here, '1e2 is treated as string which is ignored for the SUM function.

=SUM("1E2";1) returns #VALUE! because SUM() and some others that iterate over number sequences explicitly check the argument type.

## Changing the default text to number conversion settings

The text to number conversion can be customized in the Detailed Calculation Settings option.

関連項目

Detailed Calculation Settings

数をテキスト書式に設定する

ゼロで始まる数を入力する

書式 → セル → 数

数を書式設定する

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