The QDate class provides date functions. More...

#include <qdatetime.h>

Public Member Functions
	QDate ()

	QDate (int y, int m, int d)

bool	isNull () const

bool	isValid () const

int	year () const

int	month () const

int	day () const

int	dayOfWeek () const

int	dayOfYear () const

int	daysInMonth () const

int	daysInYear () const

virtual QString	monthName (int month) const

virtual QString	dayName (int weekday) const

QString	toString () const

bool	setYMD (int y, int m, int d)

QDate	addDays (int days) const

int	daysTo (const QDate &) const

bool	operator== (const QDate &d) const

bool	operator!= (const QDate &d) const

bool	operator< (const QDate &d) const

bool	operator<= (const QDate &d) const

bool	operator> (const QDate &d) const

bool	operator>= (const QDate &d) const

Static Public Member Functions
static QDate	currentDate ()

static bool	isValid (int y, int m, int d)

static bool	leapYear (int year)

Static Protected Member Functions
static uint	greg2jul (int y, int m, int d)

static void	jul2greg (uint jd, int &y, int &m, int &d)

Friends
class	QDateTime

Q_EXPORT QDataStream &	operator<< (QDataStream &, const QDate &)

Q_EXPORT QDataStream &	operator>> (QDataStream &, QDate &)

Detailed Description

The QDate class provides date functions.

A QDate object contains a calendar date, i.e. year, month, and day numbers in the modern western (Gregorian) calendar. It can read the current date from the system clock. It provides functions for comparing dates and for manipulating a date by adding a number of days.

A QDate object is typically created either by giving the year, month and day numbers explicitly, or by using the static function currentDate(), which makes a QDate object which contains the system's clock date. An explicit date can also be set using setYMD().

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(), dayName(), and monthName() functions.

QDate provides a full set of operators to compare two QDate objects. A date is considered smaller than another if it is earlier than the other.

The date a given number of days later than a given date can be found using the addDays() function. Correspondingly, the number of days between two dates can be found using the daysTo() function.

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

Note that QDate may not be used for date calculations for dates in the remote past, i.e. prior to the introduction of the Gregorian calendar. This calendar was adopted by England Sep. 14. 1752 (hence this is the earliest valid QDate), and subsequently by most other western countries, until 1923.

The end of time is reached around 8000AD, by which time we expect Qt to be obsolete.

See also: QTime, QDateTime

Constructor & Destructor Documentation

§ QDate() [1/2]

QDate::QDate ( )

inline

Constructs a null date. Null dates are invalid.

See also: isNull(), isValid()

§ QDate() [2/2]

QDate::QDate	(	int	y,
		int	m,
		int	d
	)

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

y must be in the range 1752-ca. 8000, m must be in the range 1-12, and d must be in the range 1-31. Exception: if y is in the range 0-99, it is interpreted as 1900-1999.

See also: isValid()

Member Function Documentation

§ addDays()

QDate QDate::addDays ( int ndays ) const

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

See also: daysTo()

§ currentDate()

QDate QDate::currentDate ( )

static

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

See also: QTime::currentTime(), QDateTime::currentDateTime()

§ day()

int QDate::day ( ) const

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

See also: year(), month(), dayOfWeek()

§ dayName()

QString QDate::dayName ( int weekday ) const

virtual

Returns the name of the weekday.

Weekday 1 == "Mon", day 2 == "Tue" etc.

See also: toString(), monthName()

§ dayOfWeek()

int QDate::dayOfWeek ( ) const

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

See also: day(), dayOfYear()

§ dayOfYear()

int QDate::dayOfYear ( ) const

Returns the day of the year (1..365) for this date.

See also: day(), dayOfWeek()

§ daysInMonth()

int QDate::daysInMonth ( ) const

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

See also: day(), daysInYear()

§ daysInYear()

int QDate::daysInYear ( ) const

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

See also: day(), daysInMonth()

§ daysTo()

int QDate::daysTo ( const QDate & d ) const

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

See also: addDays()

§ isNull()

bool QDate::isNull ( ) const

inline

Returns TRUE if the date is null. A null date is invalid.

See also: isValid()

§ isValid() [1/2]

bool QDate::isValid ( ) const

Returns TRUE if this date is valid.

See also: isNull()

§ isValid() [2/2]

bool QDate::isValid	(	int	y,
		int	m,
		int	d
	)

static

Returns TRUE if the specified date (year y, month m and day d) is valid.

Example:

QDate::isValid( 2002, 5, 17 );    // TRUE;  May 17th 2002 is OK.
QDate::isValid( 2002, 2, 30 );    // FALSE; Feb 30th does not exist
QDate::isValid( 2004, 2, 29 );    // TRUE; 2004 is a leap year
QDate::isValid( 1202, 6, 6 ); // FALSE; 1202 is pre-Gregorian

Note that a y value in the range 00-99 is interpreted as 1900-1999.

See also: isNull(), setYMD()

§ leapYear()

bool QDate::leapYear ( int y )

static

Returns TRUE if the specified year y is a leap year.

§ month()

int QDate::month ( ) const

Returns the month (January=1 .. December=12) of this date.

See also: year(), day()

§ monthName()

QString QDate::monthName ( int month ) const

virtual

Returns the name of the month.

Month 1 == "Jan", month 2 == "Feb" etc.

See also: toString(), dayName()

§ operator!=()

bool QDate::operator!= ( const QDate & d ) const

inline

Returns TRUE if this date is different from d, or FALSE if they are equal.

§ operator<()

bool QDate::operator< ( const QDate & d ) const

inline

Returns TRUE if this date is earlier than d, otherwise FALSE.

§ operator<=()

bool QDate::operator<= ( const QDate & d ) const

inline

Returns TRUE if this date is earlier than or equal to d, otherwise FALSE.

§ operator==()

bool QDate::operator== ( const QDate & d ) const

inline

Returns TRUE if this date is equal to d, or FALSE if they are different.

§ operator>()

bool QDate::operator> ( const QDate & d ) const

inline

Returns TRUE if this date is later than d, otherwise FALSE.

§ operator>=()

bool QDate::operator>= ( const QDate & d ) const

inline

Returns TRUE if this date is later than or equal to d, otherwise FALSE.

§ setYMD()

bool QDate::setYMD	(	int	y,
		int	m,
		int	d
	)

Sets the year y, month m and day d.

y must be in the range 1752-ca. 8000, m must be in the range 1-12, and d must be in the range 1-31. Exception: if y is in the range 0-99, it is interpreted as 1900-1999.

Returns TRUE if the date is valid, otherwise FALSE.

§ toString()

QString QDate::toString ( ) const

Returns the date as a string.

The string format is "Sat May 20 1995". This function uses the dayName() and monthName() functions to generate the string.

See also: dayName(), monthName()

§ year()

int QDate::year ( ) const

Returns the year (>= 1752) of this date.

See also: month(), day()

Friends And Related Function Documentation

§ operator<<

QDataStream & operator<<	(	QDataStream &	s,
		const QDate &	d
	)

friend

Writes the date to the stream.

See also: Format of the QDataStream operators

§ operator>>

QDataStream & operator>>	(	QDataStream &	s,
		QDate &	d
	)

friend

Reads a date from the stream.

See also: Format of the QDataStream operators

The documentation for this class was generated from the following files:

qtools/qdatetime.h
qtools/qdatetime.cpp

Public Member Functions

Static Public Member Functions

Static Protected Member Functions

Friends

Detailed Description

Constructor & Destructor Documentation

§ QDate() [1/2]

§ QDate() [2/2]

Member Function Documentation

§ addDays()

§ currentDate()

§ day()

§ dayName()

§ dayOfWeek()

§ dayOfYear()

§ daysInMonth()

§ daysInYear()

§ daysTo()

§ isNull()

§ isValid() [1/2]

§ isValid() [2/2]

§ leapYear()

§ month()

§ monthName()

§ operator!=()

§ operator<()

§ operator<=()

§ operator==()

§ operator>()

§ operator>=()

§ setYMD()

§ toString()

§ year()

Friends And Related Function Documentation

§ operator<<

§ operator>>