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## DATEVALUE

傳回引號中文字的內部日期數字。

內部日期數字會以數字傳回。數字是由 LibreOffice 用於計算日期的日期系統所決定。

若文字字串也含有時間值，則 DATEVALUE 只會傳回轉換的整數部分。

### Syntax

DATEVALUE("date_text")

Text 是有效的日期表示式，且必須在其前後加上引號。

When entering dates as part of formulas, slashes or dashes used as date separators are interpreted as arithmetic operators. Therefore, dates entered in this format are not recognized as dates and result in erroneous calculations. To keep dates from being interpreted as parts of formulas use the DATE function, for example, DATE(1954;7;20), or place the date in quotation marks and use the ISO 8601 notation, for example, "1954-07-20". Avoid using locale dependent date formats such as "07/20/54", the calculation may produce errors if the document is loaded under different locale settings.

Unambiguous conversion is possible for ISO 8601 dates and times in their extended formats with separators. If a #VALUE! error occurs, then unselect Generate #VALUE! error in LibreOffice - PreferencesTools - Options
- LibreOffice Calc - Formula, button Details... in section "Detailed Calculation Settings", Conversion from text to number list box.

### Example

=DATEVALUE("1954-07-20") yields 19925.