qdatetime man page on Peanut

Man page or keyword search:  
man Server   7435 pages
apropos Keyword Search (all sections)
Output format
Peanut logo
[printable version]

QDateTime(3qt)							QDateTime(3qt)

NAME
       QDateTime - Date and time functions

SYNOPSIS
       All the functions in this class are reentrant when Qt is built with
       thread support.</p>

       #include <qdatetime.h>

   Public Members
       QDateTime ()
       QDateTime ( const QDate & date )
       QDateTime ( const QDate & date, const QTime & time )
       bool isNull () const
       bool isValid () const
       QDate date () const
       QTime time () const
       uint toTime_t () const
       void setDate ( const QDate & date )
       void setTime ( const QTime & time )
       void setTime_t ( uint secsSince1Jan1970UTC )
       void setTime_t ( uint secsSince1Jan1970UTC, Qt::TimeSpec ts )
       QString toString ( Qt::DateFormat f = Qt::TextDate ) const
       QString toString ( const QString & format ) const
       QDateTime addDays ( int ndays ) const
       QDateTime addMonths ( int nmonths ) const
       QDateTime addYears ( int nyears ) const
       QDateTime addSecs ( int nsecs ) const
       int daysTo ( const QDateTime & dt ) const
       int secsTo ( const QDateTime & dt ) const
       bool operator== ( const QDateTime & dt ) const
       bool operator!= ( const QDateTime & dt ) const
       bool operator< ( const QDateTime & dt ) const
       bool operator<= ( const QDateTime & dt ) const
       bool operator> ( const QDateTime & dt ) const
       bool operator>= ( const QDateTime & dt ) const

   Static Public Members
       QDateTime currentDateTime ()
       QDateTime currentDateTime ( Qt::TimeSpec ts )
       QDateTime fromString ( const QString & s, Qt::DateFormat f =
	   Qt::TextDate )

RELATED FUNCTION DOCUMENTATION
       QDataStream & operator<< ( QDataStream & s, const QDateTime & dt )
       QDataStream & operator>> ( QDataStream & s, QDateTime & dt )

DESCRIPTION
       The QDateTime class provides date and time functions.

       A QDateTime object contains a calendar date and a clock time (a"
       datetime"). It is a combination of the QDate and QTime classes. It can
       read the current datetime from the system clock. It provides functions
       for comparing datetimes and for manipulating a datetime by adding a
       number of seconds, days, months or years.

       A QDateTime object is typically created either by giving a date and
       time explicitly in the constructor, or by using the static function
       currentDateTime(), which returns a QDateTime object set to the system
       clock's time. The date and time can be changed with setDate() and
       setTime(). A datetime can also be set using the setTime_t() function,
       which takes a POSIX-standard "number of seconds since 00:00:00 on
       January 1, 1970" value. The fromString() function returns a QDateTime
       given a string and a date format which is used to interpret the date
       within the string.

       The date() and time() functions provide access to the date and time
       parts of the datetime. The same information is provided in textual
       format by the toString() function.

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

       You can increment (or decrement) a datetime by a given number of
       seconds using addSecs() or days using addDays(). Similarly you can use
       addMonths() and addYears(). The daysTo() function returns the number of
       days between two datetimes, and secsTo() returns the number of seconds
       between two datetimes.

       The range of a datetime object is constrained to the ranges of the
       QDate and QTime objects which it embodies.

       See also QDate, QTime, QDateTimeEdit, and Time and Date.

MEMBER FUNCTION DOCUMENTATION
QDateTime::QDateTime ()
       Constructs a null datetime (i.e. null date and null time). A null
       datetime is invalid, since the date is invalid.

       See also isValid().

QDateTime::QDateTime ( const QDate & date )
       Constructs a datetime with date date and null (but valid) time
       (00:00:00.000).

QDateTime::QDateTime ( const QDate & date, const QTime & time )
       Constructs a datetime with date date and time time.

QDateTime QDateTime::addDays ( int ndays ) const
       Returns a QDateTime object containing a datetime ndays days later than
       the datetime of this object (or earlier if ndays is negative).

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

QDateTime QDateTime::addMonths ( int nmonths ) const
       Returns a QDateTime object containing a datetime nmonths months later
       than the datetime of this object (or earlier if nmonths is negative).

       See also daysTo(), addDays(), addYears(), and addSecs().

QDateTime QDateTime::addSecs ( int nsecs ) const
       Returns a QDateTime object containing a datetime nsecs seconds later
       than the datetime of this object (or earlier if nsecs is negative).

       See also secsTo(), addDays(), addMonths(), and addYears().

       Example: listviews/listviews.cpp.

QDateTime QDateTime::addYears ( int nyears ) const
       Returns a QDateTime object containing a datetime nyears years later
       than the datetime of this object (or earlier if nyears is negative).

       See also daysTo(), addDays(), addMonths(), and addSecs().

QDateTime QDateTime::currentDateTime ( Qt::TimeSpec ts ) [static]
       Returns the current datetime, as reported by the system clock, for the
       TimeSpec ts. The default TimeSpec is LocalTime.

       See also QDate::currentDate(), QTime::currentTime(), and Qt::TimeSpec.

       Example: listviews/listviews.cpp.

QDateTime QDateTime::currentDateTime () [static]
       This is an overloaded member function, provided for convenience. It
       behaves essentially like the above function.

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

       See also QDate::currentDate() and QTime::currentTime().

QDate QDateTime::date () const
       Returns the date part of the datetime.

       See also setDate() and time().

int QDateTime::daysTo ( const QDateTime & dt ) const
       Returns the number of days from this datetime to dt (which is negative
       if dt is earlier than this datetime).

       See also addDays() and secsTo().

QDateTime QDateTime::fromString ( const QString & s, Qt::DateFormat f =
       Qt::TextDate ) [static]
       Returns the QDateTime represented by the string s, using the format f,
       or an invalid datetime if this is not possible.

       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.

       Warning: Note that Qt::LocalDate cannot be used here.

bool QDateTime::isNull () const
       Returns TRUE if both the date and the time are null; otherwise returns
       FALSE. A null datetime is invalid.

       See also QDate::isNull() and QTime::isNull().

bool QDateTime::isValid () const
       Returns TRUE if both the date and the time are valid; otherwise returns
       FALSE.

       See also QDate::isValid() and QTime::isValid().

bool QDateTime::operator!= ( const QDateTime & dt ) const
       Returns TRUE if this datetime is different from dt; otherwise returns
       FALSE.

       See also operator==().

bool QDateTime::operator<; ( const QDateTime & dt ) const
       Returns TRUE if this datetime is earlier than dt; otherwise returns
       FALSE.

bool QDateTime::operator<;= ( const QDateTime & dt ) const
       Returns TRUE if this datetime is earlier than or equal to dt; otherwise
       returns FALSE.

bool QDateTime::operator== ( const QDateTime & dt ) const
       Returns TRUE if this datetime is equal to dt; otherwise returns FALSE.

       See also operator!=().

bool QDateTime::operator> ( const QDateTime & dt ) const
       Returns TRUE if this datetime is later than dt; otherwise returns
       FALSE.

bool QDateTime::operator>= ( const QDateTime & dt ) const
       Returns TRUE if this datetime is later than or equal to dt; otherwise
       returns FALSE.

int QDateTime::secsTo ( const QDateTime & dt ) const
       Returns the number of seconds from this datetime to dt (which is
       negative if dt is earlier than this datetime).

       Example:

	   QDateTime dt = QDateTime::currentDateTime();
	   QDateTime xmas( QDate(dt.date().year(),12,24), QTime(17,00) );
	   qDebug( "There are %d seconds to Christmas", dt.secsTo(xmas) );

       See also addSecs(), daysTo(), and QTime::secsTo().

void QDateTime::setDate ( const QDate & date )
       Sets the date part of this datetime to date.

       See also date() and setTime().

void QDateTime::setTime ( const QTime & time )
       Sets the time part of this datetime to time.

       See also time() and setDate().

void QDateTime::setTime_t ( uint secsSince1Jan1970UTC, Qt::TimeSpec ts )
       Sets the date and time to ts time (Qt::LocalTime or Qt::UTC) given the
       number of seconds that have passed since 1970-01-01T00:00:00,
       Coordinated Universal Time (UTC). On systems that do not support
       timezones this function will behave as if local time were UTC.

       On Windows, only a subset of secsSince1Jan1970UTC values are supported,
       as Windows starts counting from 1980.

       See also toTime_t().

void QDateTime::setTime_t ( uint secsSince1Jan1970UTC )
       This is an overloaded member function, provided for convenience. It
       behaves essentially like the above function.

       Convenience function that sets the date and time to local time based on
       the given UTC time.

QTime QDateTime::time () const
       Returns the time part of the datetime.

       See also setTime() and date().

QString QDateTime::toString ( const QString & format ) const
       Returns the datetime as a string. The format parameter determines the
       format of the result string.

       These expressions may be used for the date:

       <center>.nf

       </center>

       These expressions may be used for the time:

       <center>.nf

       </center>

       All other input characters will be ignored.

       Example format strings (assumed that the QDateTime is
       21<small><sup>st</sup></small> May 2001 14:13:09)

       <center>.nf

       </center>

       If the datetime is an invalid datetime, then QString::null will be
       returned.

       See also QDate::toString() and QTime::toString().

QString QDateTime::toString ( Qt::DateFormat f = Qt::TextDate ) const
       This is an overloaded member function, provided for convenience. It
       behaves essentially like the above function.

       Returns the datetime as a string. The f parameter determines the format
       of the string.

       If f is Qt::TextDate, the string format is "Wed May 20 03:40:13 1998"
       (using QDate::shortDayName(), QDate::shortMonthName(), and
       QTime::toString() to generate the string, so the day and month names
       will have localized names).

       If f is Qt::ISODate, the string format corresponds to the ISO 8601
       extended specification for representations of dates and times, which is
       YYYY-MM-DDTHH:MM:SS.

       If f is Qt::LocalDate, the string format depends on the locale settings
       of the system.

       If the format f is invalid or the datetime is invalid, toString()
       returns a null string.

       See also QDate::toString() and QTime::toString().

uint QDateTime::toTime_t () const
       Returns the datetime as the number of seconds that have passed since
       1970-01-01T00:00:00, Coordinated Universal Time (UTC).

       On systems that do not support timezones, this function will behave as
       if local time were UTC.

       See also setTime_t().

RELATED FUNCTION DOCUMENTATION
QDataStream & operator<;< ( QDataStream & s, const QDateTime & dt )
       Writes the datetime dt to the stream s.

       See also Format of the QDataStream operators.

QDataStream & operator>> ( QDataStream & s, QDateTime & dt )
       Reads a datetime from the stream s into dt.

       See also Format of the QDataStream operators.

SEE ALSO
       http://doc.trolltech.com/qdatetime.html
       http://www.trolltech.com/faq/tech.html

COPYRIGHT
       Copyright 1992-2007 Trolltech ASA, http://www.trolltech.com.  See the
       license file included in the distribution for a complete license
       statement.

AUTHOR
       Generated automatically from the source code.

BUGS
       If you find a bug in Qt, please report it as described in
       http://doc.trolltech.com/bughowto.html.	Good bug reports help us to
       help you. Thank you.

       The definitive Qt documentation is provided in HTML format; it is
       located at $QTDIR/doc/html and can be read using Qt Assistant or with a
       web browser. This man page is provided as a convenience for those users
       who prefer man pages, although this format is not officially supported
       by Trolltech.

       If you find errors in this manual page, please report them to qt-
       bugs@trolltech.com.  Please include the name of the manual page
       (qdatetime.3qt) and the Qt version (3.3.8).

Trolltech AS			2 February 2007			QDateTime(3qt)
[top]

List of man pages available for Peanut

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

[legal] [privacy] [GNU] [policy] [cookies] [netiquette] [sponsors] [FAQ]
Tweet
Polarhome, production since 1999.
Member of Polarhome portal.
Based on Fawad Halim's script.
....................................................................
Vote for polarhome
Free Shell Accounts :: the biggest list on the net