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# Format Function

Converts a numeric expression to a string, and then formats it according to the format that you specify.

### Syntax:

    Format(expression [, format As String]) As String

### Parameters:

expression: Numeric expression that you want to convert to a formatted string.

format: String that specifies the format code for the number. If format is omitted, the Format function works like the LibreOffice Basic Str() function.

### Return type:

Text string.

## 格式化代碼

In BASIC, a format code can be divided into three sections that are separated by semicolons. The first part defines the format for positive values, the second part for negative values, and the third part for zero. If you only specify one format code, it applies to all numbers.

You can set the locale used for controlling the formatting numbers, dates and currencies in LibreOffice Basic in LibreOffice - Preferences Tools - Options - Languages and Locales - General. In Basic format codes, the decimal point (.) is always used as placeholder for the decimal separator defined in your locale and will be replaced by the corresponding character.

這同樣適用於日期、時間和貨幣等格式的語言環境設定。Basic 格式代碼將依語言環境設定進行解譯和顯示。

The following list describes the codes that you can use for formatting a numeric expression:

Code | Description
--- | ---
0 | If expression has a digit at the position of the 0 in the format code, the digit is displayed, otherwise a zero is displayed. If expression has fewer digits than the number of zeros in the format code, (on either side of the decimal), leading or trailing zeros are displayed. If the expression has more digits to the left of the decimal separator than the amount of zeros in the format code, the additional digits are displayed without formatting. Decimal places in the expression are rounded according to the number of zeros that appear after the decimal separator in the format code.
# | If expression contains a digit at the position of the # placeholder in the format code, the digit is displayed, otherwise nothing is displayed at this position. This symbol works like the 0, except that leading or trailing zeroes are not displayed if there are more # characters in the format code than digits in the expression. Only the relevant digits of the expression are displayed.
. (period) | The decimal placeholder determines the number of decimal places to the left and right of the decimal separator. If the format code contains only # placeholders to the left of this symbol, numbers less than 1 begin with a decimal separator. To always display a leading zero with fractional numbers, use 0 as a placeholder for the first digit to the left of the decimal separator. 句點是用作千位分隔符還是用作小數分隔符，取決於地區設定，而作為小數分隔符顯示的實際字元取決於系統設定中的數字格式。此處的示例假定地區設定為「US」。
% | Multiplies the expressionby 100 and inserts the percent sign (%) where the expression appears in the format code.
E- E+ e- e+ | If the format code contains at least one digit placeholder (0 or #) to the right of the symbol E-, E+, e-, or e+, the expression is formatted in the scientific or exponential format. The letter E or e is inserted between the number and the exponent. The number of placeholders for digits to the right of the symbol determines the number of digits in the exponent. 如果指數為負數，則在包含 E-、E+、e-、e+ 的指數前顯示減號。如果指數為正數，則僅在包含 E+ 或 e+ 的指數前顯示加號。
- + $ ( ) space | A plus (+), minus (-), dollar ($), space, or brackets entered directly in the format code is displayed as a literal character.
\ | 若要顯示除上述之外的其他字元，必須在該字元前加反斜線 (\)，或在字元前後加引號 (" ")。 The backslash displays the next character in the format code. Characters in the format code that have a special meaning can only be displayed as literal characters if they are preceded by a backslash. The backslash itself is not displayed, unless you enter a double backslash (\\) in the format code. 在格式代碼中，為了顯示為文字字元而必須在前面加反斜線的字元包括日期、時間等格式化字元 (a、c、d、h、m、n、p、q、s、t、w、y、/、:)、數字格式化字元 (#、0、%、E、e、逗號、句點) 和字串格式化字元 (@、&、<、>、!)。

## Predefined formats

You can also use the following predefined number formats. Except for "General Number", all of the predefined format codes return the number as a decimal number with two decimal places.

如果您使用預先定義的格式，格式名稱的前後必須加上引號。

Code | Description
--- | ---
"<" | Convert expression to lower case.
">" | Convert expression to upper case.
"c" or "General Date" | Returns the numeric expression in short date format, optionally with "H:MM:SS AM/PM". If expression is a string, returns the string.
"n" | Returns the minute of the numeric expression, with 1 or 2 digits.
"nn" | Returns the minute of the numeric expression with two digits.
"w" | Returns the week day of the numeric expression. 1 is Sunday and 7 is Saturday.
"General Number" | Returns the numeric expression with 12 digits (0.############).
"Currency" | Returns the numeric expression in the currency of the locale.
"Fixed" | Returns the numeric expression with 2 decimal places (0.00).
"Standard" | Returns the numeric expression with thousands separators and 2 decimals (@0.00).
"Percent" | Returns the numeric expression as percent value (0.00%).
"Scientific" | Returns the numeric expression in scientific notation (#.00E+00).
"Yes/No" | Returns "Yes" if the numeric expression is not equal to zero, "No" otherwise. "Yes" and "No" are localized.
"True/False" | Returns "True" if the numeric expression is not equal to zero, "False" otherwise. "True" and "False" are localized.
"On/Off" | Returns "On" if the numeric expression is not equal to zero, "Off" otherwise. "On" and "Off" are localized.
"Long Date" or "dddddd" | Returns the numeric expression in system long date format, and depends on the locale.
"Medium Date" | Returns the numeric expression in date format DD-MMM-YY, and depends on the locale.
"Short Date" or "ddddd" | Returns the numeric expression in system short date format, and depends on the locale.
"Long Time" or "ttttt" | Returns the numeric expression in system long time format, and depends on the locale("H:MM:SS AM/PM").
"Medium Time" | Returns the numeric expression in system medium time format, and depends on the locale (HH:MM AM/PM).
"Short Time" | Returns the numeric expression in system short time format, and depends on the locale (HH:MM).

### 錯誤代碼：

5 無效的程序呼叫

### Example:

    Sub ExampleFormat
        MsgBox Format(6328.2, "##,##0.00")
        當您以 Basic 原始程式碼輸入數字時，REM 一律使用句點當作小數點定義符號。
        REM 例如，在英語語言環境中顯示為 6,328.20，在德語語言環境中顯示為 6.328,20
    msgbox Format("ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890", "<") ' returns abcdefghijklmnopqrstuvwxyz1234567890, digits not affected.
    msgbox Format("abcdefghijklmnopqrstuvwxyz1234567890", ">") ' returns ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890, digits not affected.
    msgBox Format(12345.6,"c") ' returns the number in date format as 18/10/33 2:24:00 PM in German locale.
    msgBox Format(12345.6,"General Date") ' Same as "c".
    msgbox format(12345.004,"n") ' returns 5
    msgbox format(12345.004,"nn") ' returns 05
    msgbox format(12345.6,"w") ' returns 4 (Wednesday).
    msgbox format(log(123),"General Number") ' returns 4,812184355372 in German locale
    msgbox format(123456.7890,"Fixed") ' 123456.79
    msgbox format(123456.1234,"Fixed") ' 123456.12
    msgbox format(123456.7890,"Standard") '123,456.79
    msgbox format(123456.1234,"Standard") '123,456.12
    msgbox format(12.3456,"Percent") ' 1234.56%
    msgbox format(0.123456,"Percent") '12.35%
    msgbox format(123,"Yes/No") ' returns localized "Yes"
    msgbox format(0,"Yes/No") ' returns localized "No"
    msgbox format(-1,"True/False") ' returns localized "True"
    msgbox format(123,"On/Off") ' returns localized "On"
    msgbox format(45756.73,"Long Date") ' returns Wednesday, April 9, 2025 in your locale
    End Sub

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Number format codes

String functions

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