日付と時刻関数

Module
Contents
Index 🔎︎

# Date & Time Functions

These spreadsheet functions are used for inserting and editing dates and times.

このコマンドの見つけ方

Insert - Function - Category Date & Time

The functions whose names end with _ADD or _EXCEL2003 return the same results as the corresponding Microsoft Excel 2003 functions without the suffix. Use the functions without suffix to get results based on international standards.

LibreOffice internally handles a date/time value as a numerical value. If you assign the numbering format "Number" to a date or time value, it is converted to a number. For example, 01/01/2000 12:00 PM, converts to 36526.5. The value preceding the decimal point corresponds to the date; the value following the decimal point corresponds to the time. If you do not want to see this type of numerical date or time representation, change the number format (date or time) accordingly. To do this, select the cell containing the date or time value, call its context menu and select Format Cells. The Numbers tab page contains the functions for defining the number format.

## 日付ゼロの日付ベース

日付は、開始日ゼロからのオフセットとして計算されます。 日付ゼロを次のいずれかに設定することができます。

日付ベース | 使用
'12/30/1899' | (デフォルト)
'01/01/1900' | (以前の StarCalc 1.0 で使用されたもの)
'01/01/1904' | (Apple ソフトウェアで使用される)

LibreOffice → 設定ツール → オプション
→ LibreOffice Calc → 計算式 で、日付ベースを選択します。

日付値が入ったセルを異なる表計算ドキュメント間でコピー＆ペーストする場合、両方の表計算ドキュメントが同じ日付ベースに設定されていなければなりません。 日付ベースが異なると、表示される日付値が変わってしまうことに注意してください。

## 2 桁の年

In LibreOffice - PreferencesTools - Options
- LibreOffice - General you find the area Year (two digits). This sets the period for which two-digit information applies. Note that changes made here have an effect on some of the following functions.

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.

## 関数

WORKDAY

YEARFRAC

DATE

DATEDIF

DATEVALUE

EDATE

TODAY

YEAR

NOW

[text/scalc/01/func_isoweeknum.xhp#isoweeknum not found].

WEEKNUM

[text/scalc/01/func_weeknum_ooo.xhp#weeknum_ooo not found].

WEEKNUM_ADD

MINUTE

MONTH

EOMONTH

NETWORKDAYS

NETWORKDAYS.INTL

WORKDAY.INTL

EASTERSUNDAY

SECOND

HOUR

DAY

DAYS

DAYS360

WEEKDAY

TIME

TIMEVALUE

関連項目

Functions by Category