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# QDate Class Reference
[QtCore module]

The QDate class provides date functions. More...

### 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

This class can be pickled.

A Python date object may be used whenever a QDate is expected.

The QDate class provides date functions.

A QDate object contains a calendar date, i.e. year, month, and day numbers, in the Gregorian calendar. (see Use of Gregorian and Julian Calendars for dates prior to 15 October 1582). It can read the current date from the system clock. It provides functions for comparing dates, and for manipulating dates. For example, it is possible to add and subtract days, months, and years to dates.

A QDate object is typically created either by giving the year, month, and day numbers explicitly. Note that QDate interprets two digit years as is, i.e., years 0 - 99. A QDate can also be constructed with the static function currentDate(), which creates a QDate object containing the system clock's date. An explicit date can also be set using setDate(). The fromString() function returns a QDate given a string and a date format which is used to interpret the date within the string.

The year(), month(), and day() functions provide access to the year, month, and day numbers. Also, dayOfWeek() and dayOfYear() functions are provided. The same information is provided in textual format by the toString(), shortDayName(), longDayName(), shortMonthName(), and longMonthName() functions.

QDate provides a full set of operators to compare two QDate objects where smaller means earlier, and larger means later.

You can increment (or decrement) a date by a given number of days using addDays(). Similarly you can use addMonths() and addYears(). The daysTo() function returns the number of days between two dates.

The daysInMonth() and daysInYear() functions return how many days there are in this date's month and year, respectively. The isLeapYear() function indicates whether a date is in a leap year.

#### Use of Gregorian and Julian Calendars

QDate uses the Gregorian calendar in all locales, beginning on the date 15 October 1582. For dates up to and including 4 October 1582, the Julian calendar is used. This means there is a 10-day gap in the internal calendar between the 4th and the 15th of October 1582. When you use QDateTime for dates in that epoch, the day after 4 October 1582 is 15 October 1582, and the dates in the gap are invalid.

The Julian to Gregorian changeover date used here is the date when the Gregorian calendar was first introduced, by Pope Gregory XIII. That change was not universally accepted and some localities only executed it at a later date (if at all). QDateTime doesn't take any of these historical facts into account. If an application must support a locale-specific dating system, it must do so on its own, remembering to convert the dates using the Julian day.

#### No Year 0

There is no year 0. Dates in that year are considered invalid. The year -1 is the year "1 before Christ" or "1 before current era." The day before 0001-01-01 is December 31st, 1 BCE.

#### Range of Valid Dates

The range of valid dates is from January 2nd, 4713 BCE, to sometime in the year 11 million CE. The Julian Day returned by QDate.toJulianDay() is a number in the contiguous range from 1 to overflow, even across QDateTime's "date holes". It is suitable for use in applications that must convert a QDateTime to a date in another calendar system, e.g., Hebrew, Islamic or Chinese.

## Type Documentation

### QDate.MonthNameType

This enum describes the types of the string representation used for the month name.

Constant | Value | Description
--- | --- | ---
`QDate.DateFormat` | `0` | This type of name can be used for date-to-string formatting.
`QDate.StandaloneFormat` | `1` | This type is used when you need to enumerate months or weekdays. Usually standalone names are represented in singular forms with capitalized first letter.

This enum was introduced or modified in Qt 4.5.

## Method Documentation

### QDate.__init__ (self)

Constructs a null date. Null dates are invalid.

See also isNull() and isValid().

### QDate.__init__ (self, int y, int m, int d)

Constructs a date with year y, month m and day d.

If the specified date is invalid, the date is not set and isValid() returns false. A date before 2 January 4713 B.C. is considered invalid.

Warning: Years 0 to 99 are interpreted as is, i.e., years 0-99.

See also isValid().

### QDate.__init__ (self, QDate)

### QDate QDate.addDays (self, int days)

Returns a QDate object containing a date ndays later than the date of this object (or earlier if ndays is negative).

See also addMonths(), addYears(), and daysTo().

### QDate QDate.addMonths (self, int months)

Returns a QDate object containing a date nmonths later than the date of this object (or earlier if nmonths is negative).

Note: If the ending day/month combination does not exist in the resulting month/year, this function will return a date that is the latest valid date.

Warning: QDate has a date hole around the days introducing the Gregorian calendar (the days 5 to 14 October 1582, inclusive, do not exist). If the calculation ends in one of those days, QDate will return either October 4 or October 15.

See also addDays() and addYears().

### QDate QDate.addYears (self, int years)

Returns a QDate object containing a date nyears later than the date of this object (or earlier if nyears is negative).

Note: If the ending day/month combination does not exist in the resulting year (i.e., if the date was Feb 29 and the final year is not a leap year), this function will return a date that is the latest valid date (that is, Feb 28).

See also addDays() and addMonths().

### QDate QDate.currentDate ()

Returns the current date, as reported by the system clock.

See also QTime.currentTime() and QDateTime.currentDateTime().

### int QDate.day (self)

Returns the day of the month (1 to 31) of this date.

See also year(), month(), and dayOfWeek().

### int QDate.dayOfWeek (self)

Returns the weekday (1 = Monday to 7 = Sunday) for this date.

See also day(), dayOfYear(), and Qt.DayOfWeek.

### int QDate.dayOfYear (self)

Returns the day of the year (1 to 365 or 366 on leap years) for this date.

See also day() and dayOfWeek().

### int QDate.daysInMonth (self)

Returns the number of days in the month (28 to 31) for this date.

See also day() and daysInYear().

### int QDate.daysInYear (self)

Returns the number of days in the year (365 or 366) for this date.

See also day() and daysInMonth().

### int QDate.daysTo (self, QDate)

Returns the number of days from this date to d (which is negative if d is earlier than this date).

Example:

     QDate d1(1995, 5, 17);  // May 17, 1995
     QDate d2(1995, 5, 20);  // May 20, 1995
     d1.daysTo(d2);          // returns 3
     d2.daysTo(d1);          // returns -3

See also addDays().

### QDate QDate.fromJulianDay (int jd)

Converts the Julian day jd to a QDate.

See also toJulianDay().

### QDate QDate.fromString (QString string, Qt.DateFormat format = Qt.TextDate)

Returns the QDate represented by the string, using the format given, or an invalid date if the string cannot be parsed.

Note for Qt.TextDate: It is recommended that you use the English short month names (e.g. "Jan"). Although localized month names can also be used, they depend on the user's locale settings.

### QDate QDate.fromString (QString s, QString format)

Returns the QDate represented by the string, using the format given, or an invalid date if the string cannot be parsed.

These expressions may be used for the format:

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().
dddd | The long localized day name (e.g. 'Monday' to 'Sunday'). Uses QDate.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().
MMMM | The long localized month name (e.g. 'January' to 'December'). Uses QDate.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.

All other input characters will be treated as text. Any sequence of characters that are enclosed in single quotes will also be treated as text and will not be used as an expression. For example:

     QDate date = QDate.fromString("1MM12car2003", "d'MM'MMcaryyyy");
     // date is 1 December 2003

If the format is not satisfied, an invalid QDate is returned. The expressions that don't expect leading zeroes (d, M) will be greedy. This means that they will use two digits even if this will put them outside the accepted range of values and leaves too few digits for other sections. For example, the following format string could have meant January 30 but the M will grab two digits, resulting in an invalid date:

     QDate date = QDate.fromString("130", "Md"); // invalid

For any field that is not represented in the format the following defaults are used:

Field | Default value
--- | ---
Year | 1900
Month | 1
Day | 1

The following examples demonstrate the default values:

     QDate.fromString("1.30", "M.d");           // January 30 1900
     QDate.fromString("20000110", "yyyyMMdd");  // January 10, 2000
     QDate.fromString("20000110", "yyyyMd");    // January 10, 2000

See also QDateTime.fromString(), QTime.fromString(), QDate.toString(), QDateTime.toString(), and QTime.toString().

### (int year, int month, int day) QDate.getDate (self)

Extracts the date's year, month, and day, and assigns them to *year, *month, and *day. The pointers may be null.

This function was introduced in Qt 4.5.

See also year(), month(), day(), and isValid().

### int QDate.gregorianToJulian (int y, int m, int d)

### bool QDate.isLeapYear (int year)

Returns true if the specified year is a leap year; otherwise returns false.

### bool QDate.isNull (self)

Returns true if the date is null; otherwise returns false. A null date is invalid.

Note: The behavior of this function is equivalent to isValid().

See also isValid().

### bool QDate.isValid (self)

Returns true if this date is valid; otherwise returns false.

See also isNull().

### bool QDate.isValid (int y, int m, int d)

This is an overloaded function.

Returns true if the specified date (year, month, and day) is valid; otherwise returns false.

Example:

     QDate.isValid(2002, 5, 17);  // true
     QDate.isValid(2002, 2, 30);  // false (Feb 30 does not exist)
     QDate.isValid(2004, 2, 29);  // true (2004 is a leap year)
     QDate.isValid(2000, 2, 29);  // true (2000 is a leap year)
     QDate.isValid(2006, 2, 29);  // false (2006 is not a leap year)
     QDate.isValid(2100, 2, 29);  // false (2100 is not a leap year)
     QDate.isValid(1202, 6, 6);   // true (even though 1202 is pre-Gregorian)

See also isNull() and setDate().

### (int y, int m, int d) QDate.julianToGregorian (int jd)

### QString QDate.longDayName (int weekday)

Returns the long version of the name of the weekday. The returned name is in normal type which can be used for date formatting.

See also toString(), shortDayName(), shortMonthName(), and longMonthName().

### QString QDate.longDayName (int weekday, MonthNameType type)

Returns the long name of the weekday for the representation specified by type.

The days are enumerated using the following convention:

- 1 = "Monday"
- 2 = "Tuesday"
- 3 = "Wednesday"
- 4 = "Thursday"
- 5 = "Friday"
- 6 = "Saturday"
- 7 = "Sunday"

The day names will be localized according to the system's default locale settings.

This function was introduced in Qt 4.5.

See also toString(), shortDayName(), shortMonthName(), and longMonthName().

### QString QDate.longMonthName (int month)

Returns the long version of the name of the month. The returned name is in normal type which can be used for date formatting.

See also toString(), shortMonthName(), shortDayName(), and longDayName().

### QString QDate.longMonthName (int month, MonthNameType type)

Returns the long name of the month for the representation specified by type.

The months are enumerated using the following convention:

- 1 = "January"
- 2 = "February"
- 3 = "March"
- 4 = "April"
- 5 = "May"
- 6 = "June"
- 7 = "July"
- 8 = "August"
- 9 = "September"
- 10 = "October"
- 11 = "November"
- 12 = "December"

The month names will be localized according to the system's default locale settings.

This function was introduced in Qt 4.5.

See also toString(), shortMonthName(), shortDayName(), and longDayName().

### int QDate.month (self)

Returns the number corresponding to the month of this date, using the following convention:

- 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() and day().

### bool QDate.setDate (self, int year, int month, int date)

Sets the date's year, month, and day. Returns true if the date is valid; otherwise returns false.

If the specified date is invalid, the QDate object is set to be invalid. Any date before 2 January 4713 B.C. is considered invalid.

This function was introduced in Qt 4.2.

See also isValid().

### bool QDate.setYMD (self, int y, int m, int d)

### QString QDate.shortDayName (int weekday)

Returns the short version of the name of the weekday. The returned name is in normal type which can be used for date formatting.

See also toString(), longDayName(), shortMonthName(), and longMonthName().

### QString QDate.shortDayName (int weekday, MonthNameType type)

Returns the short name of the weekday for the representation specified by type.

The days are enumerated using the following convention:

- 1 = "Mon"
- 2 = "Tue"
- 3 = "Wed"
- 4 = "Thu"
- 5 = "Fri"
- 6 = "Sat"
- 7 = "Sun"

The day names will be localized according to the system's default locale settings.

This function was introduced in Qt 4.5.

See also toString(), shortMonthName(), longMonthName(), and longDayName().

### QString QDate.shortMonthName (int month)

Returns the short version of the name of the month. The returned name is in normal type which can be used for date formatting.

See also toString(), longMonthName(), shortDayName(), and longDayName().

### QString QDate.shortMonthName (int month, MonthNameType type)

Returns the short name of the month for the representation specified by type.

The months are enumerated using the following convention:

- 1 = "Jan"
- 2 = "Feb"
- 3 = "Mar"
- 4 = "Apr"
- 5 = "May"
- 6 = "Jun"
- 7 = "Jul"
- 8 = "Aug"
- 9 = "Sep"
- 10 = "Oct"
- 11 = "Nov"
- 12 = "Dec"

The month names will be localized according to the system's default locale settings.

This function was introduced in Qt 4.5.

See also toString(), longMonthName(), shortDayName(), and longDayName().

### int QDate.toJulianDay (self)

Converts the date to a Julian day.

See also fromJulianDay().

### datetime.date QDate.toPyDate (self)

### QString QDate.toString (self, Qt.DateFormat format = Qt.TextDate)

Returns the date as a string. The format parameter determines the format of the result string.

These expressions may be used:

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().
dddd | the long localized day name (e.g. 'Monday' to 'Sunday'). Uses QDate.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().
MMMM | the long localized month name (e.g. 'January' to 'December'). Uses QDate.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.

All other input characters will be ignored. Any sequence of characters that are enclosed in singlequotes will be treated as text and not be used as an expression. Two consecutive singlequotes ("''") are replaced by a singlequote in the output.

Example format strings (assuming that the QDate is the 20 July 1969):

Format | Result
--- | ---
dd.MM.yyyy | 20.07.1969
ddd MMMM d yy | Sun July 20 69
'The day is' dddd | The day is Sunday

If the datetime is invalid, an empty string will be returned.

Warning: The Qt.ISODate format is only valid for years in the range 0 to 9999. This restriction may apply to locale-aware formats as well, depending on the locale settings.

See also QDateTime.toString() and QTime.toString().

### QString QDate.toString (self, QString format)

This is an overloaded function.

Returns the date as a string. The format parameter determines the format of the string.

If the format is Qt.TextDate, the string is formatted in the default way. QDate.shortDayName() and QDate.shortMonthName() are used to generate the string, so the day and month names will be localized names using the default locale from the system. An example of this formatting is "Sat May 20 1995".

If the format is Qt.ISODate, the string format corresponds to the ISO 8601 extended specification for representations of dates and times, taking the form YYYY-MM-DD, where YYYY is the year, MM is the month of the year (between 01 and 12), and DD is the day of the month between 01 and 31.

If the format is Qt.SystemLocaleShortDate or Qt.SystemLocaleLongDate, the string format depends on the locale settings of the system. Identical to calling QLocale.system().toString(date, QLocale.ShortFormat) or QLocale.system().toString(date, QLocale.LongFormat).

If the format is Qt.DefaultLocaleShortDate or Qt.DefaultLocaleLongDate, the string format depends on the default application locale. This is the locale set with QLocale.setDefault(), or the system locale if no default locale has been set. Identical to calling QLocale().toString(date, QLocale.ShortFormat) or QLocale().toString(date, QLocale.LongFormat).

If the date is invalid, an empty string will be returned.

Warning: The Qt.ISODate format is only valid for years in the range 0 to 9999. This restriction may apply to locale-aware formats as well, depending on the locale settings.

See also shortDayName() and shortMonthName().

### (int, int yearNumber) QDate.weekNumber (self)

Returns the week number (1 to 53), and stores the year in *yearNumber unless yearNumber is null (the default).

Returns 0 if the date is invalid.

In accordance with ISO 8601, weeks start on Monday and the first Thursday of a year is always in week 1 of that year. Most years have 52 weeks, but some have 53.

*yearNumber is not always the same as year(). For example, 1 January 2000 has week number 52 in the year 1999, and 31 December 2002 has week number 1 in the year 2003.

See also isValid().

### int QDate.year (self)

Returns the year of this date. Negative numbers indicate years before 1 A.D. = 1 C.E., such that year -44 is 44 B.C.

See also month() and 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)