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## DATEVALUE

加引号的文字返回内部日期值。

内部日期值作为数字返回。该数字取决于 LibreOffice 用来计算日期的日期系统。

如果文本字符串也包括时间值，DATEVALUE 只返回换算结果的整数部分。

### Syntax

DATEVALUE(date_text)

Text 是一个有效的日期表达式，且必须在其前后加上引号。

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.