# QDate Class Reference
## [[QtCore](index.htm) module]
該的QDate類提供??的日期函數。[More...](#details)
### Types
* `enum MonthNameType { DateFormat, StandaloneFormat }`
### Methods
* `__init__ (self)`
* `__init__ (self, int?y, int?m, int?d)`
* `__init__ (self, QDate)`
* `QDate addDays (self, int?days)`
* `QDate addMonths (self, int?months)`
* `QDate addYears (self, int?years)`
* `int day (self)`
* `int dayOfWeek (self)`
* `int dayOfYear (self)`
* `int daysInMonth (self)`
* `int daysInYear (self)`
* `int daysTo (self, QDate)`
* `(int?year, int?month, int?day) getDate (self)`
* `bool isNull (self)`
* `bool isValid (self)`
* `int month (self)`
* `bool setDate (self, int?year, int?month, int?date)`
* `bool setYMD (self, int?y, int?m, int?d)`
* `int toJulianDay (self)`
* `datetime.date toPyDate (self)`
* `QString toString (self, Qt.DateFormat?format?=?Qt.TextDate)`
* `QString toString (self, QString?format)`
* `(int, int?yearNumber) weekNumber (self)`
* `int year (self)`
### Static Methods
* `QDate currentDate ()`
* `QDate fromJulianDay (int?jd)`
* `QDate fromString (QString?string, Qt.DateFormat?format?=?Qt.TextDate)`
* `QDate fromString (QString?s, QString?format)`
* `int gregorianToJulian (int?y, int?m, int?d)`
* `bool isLeapYear (int?year)`
* `bool isValid (int?y, int?m, int?d)`
* `(int?y, int?m, int?d) julianToGregorian (int?jd)`
* `QString longDayName (int?weekday)`
* `QString longDayName (int?weekday, MonthNameType?type)`
* `QString longMonthName (int?month)`
* `QString longMonthName (int?month, MonthNameType?type)`
* `QString shortDayName (int?weekday)`
* `QString shortDayName (int?weekday, MonthNameType?type)`
* `QString shortMonthName (int?month)`
* `QString shortMonthName (int?month, MonthNameType?type)`
### Special Methods
* `int __bool__ (self)`
* `bool __eq__ (self, QDate?other)`
* `bool __ge__ (self, QDate?other)`
* `bool __gt__ (self, QDate?other)`
* `int __hash__ (self)`
* `bool __le__ (self, QDate?other)`
* `bool __lt__ (self, QDate?other)`
* `bool __ne__ (self, QDate?other)`
* `str __repr__ (self)`
* * *
## Detailed Description
這個類可以醃制。
可以使用Python的日期對象,每當一個[QDate](qdate.html)預計。
該的QDate類提供??的日期函數。
一個的QDate對象包含一個日歷日期,即年,月和日的數字,在公歷。 (見[Use of Gregorian and Julian Calendars](#qdate-g-and-j)對于之前的日期10月15日1582年) 。它可以從系統時鐘讀取當前的日期。它提供的功能來比較日期和操作日期。例如,它可以添加和減去天,月和年的日期。
一個的QDate對象通常是通過明確給出的年,月和日的數字創造。注意的QDate解釋兩位數字的年份原樣,即年0 - 99 。一個的QDate也可以與靜態構造函數[currentDate](qdate.html#currentDate)(),它創建一個包含系統時鐘的日期的QDate對象。一個明確的日期,也可以使用設置[setDate](qdate.html#setDate)( ) 。該[fromString](qdate.html#fromString)( )函數返回給定一個字符串,它用于在字符串中解釋日期的日期格式的QDate 。
該[year](qdate.html#year)( )[month](qdate.html#month)()和[day](qdate.html#day)( )函數提供訪問年,月和日的數字。另外,[dayOfWeek](qdate.html#dayOfWeek)()和[dayOfYear](qdate.html#dayOfYear)( )函數提供的。相同的信息被提供以文本格式[toString](qdate.html#toString)( )[shortDayName](qdate.html#shortDayName)( )[longDayName](qdate.html#longDayName)( )[shortMonthName](qdate.html#shortMonthName)()和[longMonthName](qdate.html#longMonthName)()函數。
的QDate提供了一整套運營商來比較兩個的QDate對象,其中較小的手段更早和更大的手段更高版本。
你可以遞增(或遞減)的日期的天使用給定的數[addDays](qdate.html#addDays)( ) 。同樣,您可以使用[addMonths](qdate.html#addMonths)()和[addYears](qdate.html#addYears)( ) 。該[daysTo](qdate.html#daysTo)( )函數返回兩個日期之間的天數。
該[daysInMonth](qdate.html#daysInMonth)()和[daysInYear](qdate.html#daysInYear)( )函數返回多少天有在此日期的月和年,分別。該[isLeapYear](qdate.html#isLeapYear)( )函數表示的日期是否是閏年。
#### Use of Gregorian and Julian Calendars
的QDate使用公歷中的所有語言環境, 1582年10月開始的日期15 。對于日期截至及包括1582年10月4日,儒略歷被使用。這意味著有一個10天的差距在1582年10月4日和15日之間的內部日歷。當您使用[QDateTime](qdatetime.html)的日期在那個時代, 1582年10月4日之后的一天是1582年10月15日,和日期的差距是無效的。
朱利安在這里使用的公歷轉換日期是首次引入公歷,由羅馬教皇格里高利十三日。這變化是沒有被普遍接受,一些地方只執行它在稍后的日期(如果有的話) 。[QDateTime](qdatetime.html)不采取任何這些歷史事實考慮在內。如果應用程序必須支持區域設置特定的約會系統,它必須這樣做對自己,記住要轉換使用儒略日的日期。
#### No Year 0
沒有0年。在這一年的日期將被視為無效。當年-1是今年“ 1基督之前”或“ 1日前電流的時代。 ” 0001-01-01前一天是12月31日, 1 BCE 。
#### Range of Valid Dates
有效的日期范圍是從1月2日, 4713 BCE ,到某個時候在今年1100萬CE認證。儒略日傳回[QDate.toJulianDay](qdate.html#toJulianDay)()是一個數字,在連續的范圍從1到_overflow_,甚至跨越[QDateTime](qdatetime.html)的“日漏洞” 。它適合于使用在應用程序必須將一個[QDateTime](qdatetime.html)在另一個日歷系統,例如,希伯來文,伊斯蘭教還是中國的日期。
* * *
## Type Documentation
```
QDate.MonthNameType
```
這個枚舉變量描述了用于月份名稱的字符串表示的類型。
| Constant | Value | Description |
| --- | --- | --- |
| `QDate.DateFormat` | `0` | 這種類型的名稱,可用于日期到字符串的格式。 |
| `QDate.StandaloneFormat` | `1` | 當你需要枚舉數月或平日使用此類型。通常是獨立的名稱代表單數形式用大寫第一個字母。 |
這個枚舉被引入或修改的Qt 4.5 。
* * *
## Method Documentation
```
QDate.__init__ (self)
```
構造一個空的日期。空日期是無效的。
**See also** [isNull](qdate.html#isNull)()和[isValid](qdate.html#isValid)( ) 。
```
QDate.__init__ (self, int?y, int?m, int?d)
```
構造一個日期與年份_y_,月_m_和日_d_。
如果指定的日期無效,未設定日期和[isValid](qdate.html#isValid)( )返回False 。之前, 1月2日公元前4713一個日期被視為無效。
**Warning:**年0?99被解釋為是,即年0-99 。
**See also** [isValid](qdate.html#isValid)( ) 。
```
QDate.__init__ (self, QDate)
```
```
QDate QDate.addDays (self, int?days)
```
[](qdate.html)
[返回](qdate.html)[QDate](qdate.html)對象包含日期_ndays_遲于該對象的日期(或更早版本,如果_ndays_是負的) 。
**See also** [addMonths](qdate.html#addMonths)( )[addYears](qdate.html#addYears)()和[daysTo](qdate.html#daysTo)( ) 。
```
QDate QDate.addMonths (self, int?months)
```
[](qdate.html)
[返回](qdate.html)[QDate](qdate.html)對象包含日期_nmonths_遲于該對象的日期(或更早版本,如果_nmonths_是負的) 。
**Note:**如果結束日/月組合不在所產生的月/年存在,該函數將返回是最新的有效日期的日期。
**Warning:** [QDate](qdate.html)周圍有天推出公歷日期穴(工作日5 1582年10月14日(含) ,不存在) 。如果計算當年的一端,[QDate](qdate.html)將返回無論是10月4日或10月15日。
**See also** [addDays](qdate.html#addDays)()和[addYears](qdate.html#addYears)( ) 。
```
QDate QDate.addYears (self, int?years)
```
[](qdate.html)
[返回](qdate.html)[QDate](qdate.html)對象包含日期_nyears_遲于該對象的日期(或更早版本,如果_nyears_是負的) 。
**Note:**如果結束日/月組合不在所產生的年存在(即,如果日期是2月29日及最后一年是不是閏年) ,該函數將返回是最新的有效日期的日期(即, 2月28日) 。
**See also** [addDays](qdate.html#addDays)()和[addMonths](qdate.html#addMonths)( ) 。
```
QDate QDate.currentDate ()
```
[
返回當前日期,所報告的系統時鐘。
](qdate.html)
[**See also**](qdate.html) [QTime.currentTime](qtime.html#currentTime)()和[QDateTime.currentDateTime](qdatetime.html#currentDateTime)( ) 。
```
int QDate.day (self)
```
返回此日期的月份的天( 1到31) 。
**See also** [year](qdate.html#year)( )[month](qdate.html#month)()和[dayOfWeek](qdate.html#dayOfWeek)( ) 。
```
int QDate.dayOfWeek (self)
```
返回工作日( 1 =周一到7 =星期日)為這個日期。
**See also** [day](qdate.html#day)( )[dayOfYear](qdate.html#dayOfYear)()和[Qt.DayOfWeek](qt.html#DayOfWeek-enum)。
```
int QDate.dayOfYear (self)
```
返回一年中的天(1到365或366的閏年)這個日期。
**See also** [day](qdate.html#day)()和[dayOfWeek](qdate.html#dayOfWeek)( ) 。
```
int QDate.daysInMonth (self)
```
返回天的月份數( 28 ?31)這個日期。
**See also** [day](qdate.html#day)()和[daysInYear](qdate.html#daysInYear)( ) 。
```
int QDate.daysInYear (self)
```
返回天在該年的數字( 365或366 ),這個日期。
**See also** [day](qdate.html#day)()和[daysInMonth](qdate.html#daysInMonth)( ) 。
```
int QDate.daysTo (self, QDate)
```
返回從這個日期的天數來_d_(這是否定的,如果_d_早于這個日期) 。
例如:
```
[QDate](qdate.html) d1(1995, 5, 17); // May 17, 1995
[QDate](qdate.html) d2(1995, 5, 20); // May 20, 1995
d1.daysTo(d2); // returns 3
d2.daysTo(d1); // returns -3
```
**See also** [addDays](qdate.html#addDays)( ) 。
```
QDate QDate.fromJulianDay (int?jd)
```
[](qdate.html)
[儒略日轉換_jd_到](qdate.html)[QDate](qdate.html)。
**See also** [toJulianDay](qdate.html#toJulianDay)( ) 。
```
QDate QDate.fromString (QString?string, Qt.DateFormat?format?=?Qt.TextDate)
```
[](qdate.html)
[返回](qdate.html)[QDate](qdate.html)由表示_string_使用_format_給予,或者如果該字符串無法解析無效的日期。
注意事項[Qt.TextDate](qt.html#DateFormat-enum):建議您使用英文短的月份名稱(例如“揚” ) 。雖然本地化月名也可以使用,它們依賴于用戶的區域設置。
```
QDate QDate.fromString (QString?s, QString?format)
```
[](qdate.html)
[返回](qdate.html)[QDate](qdate.html)由表示_string_使用_format_給予,或者如果該字符串無法解析無效的日期。
這些表達式可以用于格式:
| Expression | Output |
| --- | --- |
| d | The day as a number without a leading zero (1 to 31) |
| dd | The day as a number with a leading zero (01 to 31) |
| ddd | The abbreviated localized day name (e.g. 'Mon' to 'Sun'). Uses [QDate.shortDayName](qdate.html#shortDayName)(). |
| dddd | The long localized day name (e.g. 'Monday' to 'Sunday'). Uses [QDate.longDayName](qdate.html#longDayName)(). |
| M | The month as a number without a leading zero (1 to 12) |
| MM | The month as a number with a leading zero (01 to 12) |
| MMM | The abbreviated localized month name (e.g. 'Jan' to 'Dec'). Uses [QDate.shortMonthName](qdate.html#shortMonthName)(). |
| MMMM | The long localized month name (e.g. 'January' to 'December'). Uses [QDate.longMonthName](qdate.html#longMonthName)(). |
| yy | The year as two digit number (00 to 99) |
| yyyy | The year as four digit number. If the year is negative, a minus sign is prepended in addition. |
所有其他輸入的字符將被視為文本。括在單引號中的任何字符序列也將被視為文本,不會被用作表達式。例如:
```
[QDate](qdate.html) date = [QDate](qdate.html).fromString("1MM12car2003", "d'MM'MMcaryyyy");
// date is 1 December 2003
```
如果格式不符合,無效[QDate](qdate.html)返回。不指望前導零( D,M )中的表達式將是貪婪的。這意味著,他們將使用兩個數字,即使這會放到屋外,價值觀的接受范圍,并留下了幾個數字的其他部分。例如,下面的格式字符串可能意味著1月30日,但對M將抓住兩個數字,從而導致無效的日期:
```
[QDate](qdate.html) date = [QDate](qdate.html).fromString("130", "Md"); // invalid
```
對于未在格式表示任何領域使用以下缺省值:
| Field | Default value |
| --- | --- |
| Year | 1900 |
| Month | 1 |
| Day | 1 |
下面的例子演示了默認值:
```
[QDate](qdate.html).fromString("1.30", "M.d"); // January 30 1900
[QDate](qdate.html).fromString("20000110", "yyyyMMdd"); // January 10, 2000
[QDate](qdate.html).fromString("20000110", "yyyyMd"); // January 10, 2000
```
**See also** [QDateTime.fromString](qdatetime.html#fromString)( )[QTime.fromString](qtime.html#fromString)( )[QDate.toString](qdate.html#toString)( )[QDateTime.toString](qdatetime.html#toString)()和[QTime.toString](qtime.html#toString)( ) 。
```
(int?year, int?month, int?day) QDate.getDate (self)
```
提取日期的年,月,日,并為它們分配到*_year_*_month_和*_day_。指針可以為null 。
此功能被引入Qt的4.5 。
**See also** [year](qdate.html#year)( )[month](qdate.html#month)( )[day](qdate.html#day)()和[isValid](qdate.html#isValid)( ) 。
```
int QDate.gregorianToJulian (int?y, int?m, int?d)
```
```
bool QDate.isLeapYear (int?year)
```
返回True如果指定的_year_為閏年,否則返回False 。
```
bool QDate.isNull (self)
```
返回True如果date為空,否則返回False 。一個空的日期是無效的。
**Note:**此函數的行為等同于[isValid](qdate.html#isValid)( ) 。
**See also** [isValid](qdate.html#isValid)( ) 。
```
bool QDate.isValid (self)
```
返回True如果這個日期是有效的,否則返回False 。
**See also** [isNull](qdate.html#isNull)( ) 。
```
bool QDate.isValid (int?y, int?m, int?d)
```
這是一個重載函數。
返回True如果指定的日期(_year_,_month_和_day_)是有效的,否則返回False 。
例如:
```
[QDate](qdate.html).isValid(2002, 5, 17); // true
[QDate](qdate.html).isValid(2002, 2, 30); // false (Feb 30 does not exist)
[QDate](qdate.html).isValid(2004, 2, 29); // true (2004 is a leap year)
[QDate](qdate.html).isValid(2000, 2, 29); // true (2000 is a leap year)
[QDate](qdate.html).isValid(2006, 2, 29); // false (2006 is not a leap year)
[QDate](qdate.html).isValid(2100, 2, 29); // false (2100 is not a leap year)
[QDate](qdate.html).isValid(1202, 6, 6); // true (even though 1202 is pre-Gregorian)
```
**See also** [isNull](qdate.html#isNull)()和[setDate](qdate.html#setDate)( ) 。
```
(int?y, int?m, int?d) QDate.julianToGregorian (int?jd)
```
```
QString QDate.longDayName (int?weekday)
```
返回長版的名稱_weekday_。返回的名字是在正常的類型,它可以用于日期格式。
**See also** [toString](qdate.html#toString)( )[shortDayName](qdate.html#shortDayName)( )[shortMonthName](qdate.html#shortMonthName)()和[longMonthName](qdate.html#longMonthName)( ) 。
```
QString QDate.longDayName (int?weekday, MonthNameType?type)
```
返回的長名稱_weekday_用于通過指定的代表性_type_。
天都使用以下約定列舉:
* 1 = "Monday"
* 2 = "Tuesday"
* 3 = "Wednesday"
* 4 = "Thursday"
* 5 = "Friday"
* 6 = "Saturday"
* 7 = "Sunday"
各天的名稱將根據系統的默認區域設置進行本地化。
此功能被引入Qt的4.5 。
**See also** [toString](qdate.html#toString)( )[shortDayName](qdate.html#shortDayName)( )[shortMonthName](qdate.html#shortMonthName)()和[longMonthName](qdate.html#longMonthName)( ) 。
```
QString QDate.longMonthName (int?month)
```
返回長版的名稱_month_。返回的名字是在正常的類型,它可以用于日期格式。
**See also** [toString](qdate.html#toString)( )[shortMonthName](qdate.html#shortMonthName)( )[shortDayName](qdate.html#shortDayName)()和[longDayName](qdate.html#longDayName)( ) 。
```
QString QDate.longMonthName (int?month, MonthNameType?type)
```
返回的長名稱_month_用于通過指定的代表性_type_。
月均使用以下約定列舉:
* 1 = "January"
* 2 = "February"
* 3 = "March"
* 4 = "April"
* 5 = "May"
* 6 = "June"
* 7 = "July"
* 8 = "August"
* 9 = "September"
* 10 = "October"
* 11 = "November"
* 12 = "December"
月份名稱將根據系統的默認區域設置進行本地化。
此功能被引入Qt的4.5 。
**See also** [toString](qdate.html#toString)( )[shortMonthName](qdate.html#shortMonthName)( )[shortDayName](qdate.html#shortDayName)()和[longDayName](qdate.html#longDayName)( ) 。
```
int QDate.month (self)
```
返回對應于該日期的月份,使用以下約定數量:
* 1 = "January"
* 2 = "February"
* 3 = "March"
* 4 = "April"
* 5 = "May"
* 6 = "June"
* 7 = "July"
* 8 = "August"
* 9 = "September"
* 10 = "October"
* 11 = "November"
* 12 = "December"
**See also** [year](qdate.html#year)()和[day](qdate.html#day)( ) 。
```
bool QDate.setDate (self, int?year, int?month, int?date)
```
設定日期的_year_,_month_和_day_。返回True如果日期是有效的,否則返回False 。
如果指定的日期是無效的,[QDate](qdate.html)對象被設置為無效。之前, 1月2日公元前4713的任何日期被視為無效。
這個函數中引入了Qt 4.2中。
**See also** [isValid](qdate.html#isValid)( ) 。
```
bool QDate.setYMD (self, int?y, int?m, int?d)
```
```
QString QDate.shortDayName (int?weekday)
```
返回的是短版的名稱_weekday_。返回的名字是在正常的類型,它可以用于日期格式。
**See also** [toString](qdate.html#toString)( )[longDayName](qdate.html#longDayName)( )[shortMonthName](qdate.html#shortMonthName)()和[longMonthName](qdate.html#longMonthName)( ) 。
```
QString QDate.shortDayName (int?weekday, MonthNameType?type)
```
返回的短名稱_weekday_用于通過指定的代表性_type_。
天都使用以下約定列舉:
* 1 = "Mon"
* 2 = "Tue"
* 3 = "Wed"
* 4 = "Thu"
* 5 = "Fri"
* 6 = "Sat"
* 7 = "Sun"
各天的名稱將根據系統的默認區域設置進行本地化。
此功能被引入Qt的4.5 。
**See also** [toString](qdate.html#toString)( )[shortMonthName](qdate.html#shortMonthName)( )[longMonthName](qdate.html#longMonthName)()和[longDayName](qdate.html#longDayName)( ) 。
```
QString QDate.shortMonthName (int?month)
```
返回的是短版的名稱_month_。返回的名字是在正常的類型,它可以用于日期格式。
**See also** [toString](qdate.html#toString)( )[longMonthName](qdate.html#longMonthName)( )[shortDayName](qdate.html#shortDayName)()和[longDayName](qdate.html#longDayName)( ) 。
```
QString QDate.shortMonthName (int?month, MonthNameType?type)
```
返回的短名稱_month_用于通過指定的代表性_type_。
月均使用以下約定列舉:
* 1 = "Jan"
* 2 = "Feb"
* 3 = "Mar"
* 4 = "Apr"
* 5 = "May"
* 6 = "Jun"
* 7 = "Jul"
* 8 = "Aug"
* 9 = "Sep"
* 10 = "Oct"
* 11 = "Nov"
* 12 = "Dec"
月份名稱將根據系統的默認區域設置進行本地化。
此功能被引入Qt的4.5 。
**See also** [toString](qdate.html#toString)( )[longMonthName](qdate.html#longMonthName)( )[shortDayName](qdate.html#shortDayName)()和[longDayName](qdate.html#longDayName)( ) 。
```
int QDate.toJulianDay (self)
```
日期轉換為儒略日。
**See also** [fromJulianDay](qdate.html#fromJulianDay)( ) 。
```
datetime.date QDate.toPyDate (self)
```
```
QString QDate.toString (self, Qt.DateFormat?format?=?Qt.TextDate)
```
返回的日期字符串。該_format_參數決定了結果字符串的格式。
這些表達式可用于:
| Expression | Output |
| --- | --- |
| d | the day as number without a leading zero (1 to 31) |
| dd | the day as number with a leading zero (01 to 31) |
| ddd | the abbreviated localized day name (e.g. 'Mon' to 'Sun'). Uses [QDate.shortDayName](qdate.html#shortDayName)(). |
| dddd | the long localized day name (e.g. 'Monday' to 'Sunday'). Uses [QDate.longDayName](qdate.html#longDayName)(). |
| M | the month as number without a leading zero (1 to 12) |
| MM | the month as number with a leading zero (01 to 12) |
| MMM | the abbreviated localized month name (e.g. 'Jan' to 'Dec'). Uses [QDate.shortMonthName](qdate.html#shortMonthName)(). |
| MMMM | the long localized month name (e.g. 'January' to 'December'). Uses [QDate.longMonthName](qdate.html#longMonthName)(). |
| yy | the year as two digit number (00 to 99) |
| yyyy | the year as four digit number. If the year is negative, a minus sign is prepended in addition. |
所有其它輸入的字符將被忽略。括在singlequotes任何字符序列將被視為文本,而不是被用作表達。連續兩singlequotes ( “''” )是由singlequote輸出所取代。
例如格式字符串(假設[QDate](qdate.html)是1969年7月20日) :
| Format | Result |
| --- | --- |
| dd.MM.yyyy | 20.07.1969 |
| ddd MMMM d yy | Sun July 20 69 |
| 'The day is' dddd | The day is Sunday |
如果日期時間是無效的,空字符串將被返回。
**Warning:**該[Qt.ISODate](qt.html#DateFormat-enum)格式僅適用于年范圍為0 ?9999 。這種限制可能適用于區域設置的格式為好,這取決于區域設置。
**See also** [QDateTime.toString](qdatetime.html#toString)()和[QTime.toString](qtime.html#toString)( ) 。
```
QString QDate.toString (self, QString?format)
```
這是一個重載函數。
返回的日期字符串。該_format_參數確定字符串的格式。
如果_format_ is [Qt.TextDate](qt.html#DateFormat-enum),該字符串被格式化的默認方式。[QDate.shortDayName](qdate.html#shortDayName)()和[QDate.shortMonthName](qdate.html#shortMonthName)( )用于生成字符串,所以日期和月份名稱將使用默認語言環境從系統中本地化的名稱。這種格式的一個例子是“星期六1995年5月20日” 。
如果_format_ is [Qt.ISODate](qt.html#DateFormat-enum),字符串格式對應于ISO 8601擴展規格的日期和時間的表示,采取的形式為YYYY- MM- DD,其中YYYY是年, MM是一年中的月份( 01? 12 ) ,而DD是本月01到31之間的一天。
如果_format_ is [Qt.SystemLocaleShortDate](qt.html#DateFormat-enum) or [Qt.SystemLocaleLongDate](qt.html#DateFormat-enum),字符串格式取決于系統的區域設置。相同的調用[QLocale.system](qlocale.html#system)( ) 。的toString (日期,[QLocale.ShortFormat](qlocale.html#FormatType-enum))或[QLocale.system](qlocale.html#system)( ) 。的toString (日期,[QLocale.LongFormat](qlocale.html#FormatType-enum)) 。
如果_format_ is [Qt.DefaultLocaleShortDate](qt.html#DateFormat-enum) or [Qt.DefaultLocaleLongDate](qt.html#DateFormat-enum),字符串格式依賴于默認應用程序的語言環境。這就是語言環境設置[QLocale.setDefault](qlocale.html#setDefault)( )或系統區域設置,如果沒有默認區域設置已定。相同的調用QLocale ( ) 。的toString (日期,[QLocale.ShortFormat](qlocale.html#FormatType-enum))或QLocale ( ) 。的toString (日期,[QLocale.LongFormat](qlocale.html#FormatType-enum)) 。
如果日期是無效的,空字符串將被返回。
**Warning:**該[Qt.ISODate](qt.html#DateFormat-enum)格式僅適用于年范圍為0 ?9999 。這種限制可能適用于區域設置的格式為好,這取決于區域設置。
**See also** [shortDayName](qdate.html#shortDayName)()和[shortMonthName](qdate.html#shortMonthName)( ) 。
```
(int, int?yearNumber) QDate.weekNumber (self)
```
返回的周數( 1到53 ) ,并在今年存儲在*_yearNumber_除非_yearNumber_為null (默認值) 。
返回0,如果日期是無效的。
按照ISO 8601 ,周從星期一開始,一年的第一個星期四是永遠在那年的1周。大多數年份有52周,但有些53 。
*_yearNumber_并不總是相同[year](qdate.html#year)( ) 。例如, 2000年1月1日在1999年的周數52 ,與二零零二年十二月在2003年的周數1 。
版權所有(c )1989加州大學董事會。保留所有權利。
再分配和在源代碼和二進制形式的使用是允許的前提是上述版權聲明和本段是重復在所有這些形式和任何文件,廣告材料,以及與這種分配并使用承認,該軟件是由開發的其他材料加州大學伯克利分校。該大學的名稱不得用于認可或推廣源自此軟件,而無需事先書面許可的產品。本軟件提供的“原樣”,沒有任何明示或暗示的擔保,包括但不限于適銷性和適用性的暗示擔保針對特定用途。
**See also** [isValid](qdate.html#isValid)( ) 。
```
int QDate.year (self)
```
返回此日期的年份。負數表示幾年前1 AD = 1 CE認證,例如當年-44是公元前44年
**See also** [month](qdate.html#month)()和[day](qdate.html#day)( ) 。
```
int QDate.__bool__ (self)
```
```
bool QDate.__eq__ (self, QDate?other)
```
```
bool QDate.__ge__ (self, QDate?other)
```
```
bool QDate.__gt__ (self, QDate?other)
```
```
int QDate.__hash__ (self)
```
```
bool QDate.__le__ (self, QDate?other)
```
```
bool QDate.__lt__ (self, QDate?other)
```
```
bool QDate.__ne__ (self, QDate?other)
```
```
str QDate.__repr__ (self)
```
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- QValidator Class Reference
- QVariant Class Reference
- QVariantAnimation Class Reference
- QVBoxLayout Class Reference
- QVector2D Class Reference
- QVector3D Class Reference
- QVector4D Class Reference
- QVideoFrame Class Reference
- QVideoSurfaceFormat Class Reference
- QWaitCondition Class Reference
- QWebDatabase Class Reference
- QWebElement Class Reference
- QWebElementCollection Class Reference
- QWebFrame Class Reference
- QWebHistory Class Reference
- QWebHistoryInterface Class Reference
- QWebHistoryItem Class Reference
- QWebHitTestResult Class Reference
- QWebInspector Class Reference
- QWebPage Class Reference
- QWebPluginFactory Class Reference
- QWebSecurityOrigin Class Reference
- QWebSettings Class Reference
- QWebView Class Reference
- QWhatsThis Class Reference
- QWhatsThisClickedEvent Class Reference
- QWheelEvent Class Reference
- QWidget Class Reference
- QWidgetAction Class Reference
- QWidgetItem Class Reference
- QWindowStateChangeEvent Class Reference
- QWizard Class Reference
- QWizardPage Class Reference
- QWorkspace Class Reference
- QWriteLocker Class Reference
- QX11EmbedContainer Class Reference
- QX11EmbedWidget Class Reference
- QX11Info Class Reference
- QXmlAttributes Class Reference
- QXmlContentHandler Class Reference
- QXmlDeclHandler Class Reference
- QXmlDefaultHandler Class Reference
- QXmlDTDHandler Class Reference
- QXmlEntityResolver Class Reference
- QXmlErrorHandler Class Reference
- QXmlFormatter Class Reference
- QXmlInputSource Class Reference
- QXmlItem Class Reference
- QXmlLexicalHandler Class Reference
- QXmlLocator Class Reference
- QXmlName Class Reference
- QXmlNamePool Class Reference
- QXmlNamespaceSupport Class Reference
- QXmlNodeModelIndex Class Reference
- QXmlParseException Class Reference
- QXmlQuery Class Reference
- QXmlReader Class Reference
- QXmlResultItems Class Reference
- QXmlSchema Class Reference
- QXmlSchemaValidator Class Reference
- QXmlSerializer Class Reference
- QXmlSimpleReader Class Reference
- QXmlStreamAttribute Class Reference
- QXmlStreamAttributes Class Reference
- QXmlStreamEntityDeclaration Class Reference
- QXmlStreamEntityResolver Class Reference
- QXmlStreamNamespaceDeclaration Class Reference
- QXmlStreamNotationDeclaration Class Reference
- QXmlStreamReader Class Reference
- QXmlStreamWriter Class Reference