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The QDateTime class provides date and time functions. More...
#include <qdatetime.h>
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 or days.
A QDateTime object is typically created either by giving a date and time explicitly, or by using the static function currentTime(), which makes a QDateTime object which contains the system's clock time.
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. A datetime is considered smaller than another if it is earlier than the other.
The datetime a given number of days or seconds later than a given datetime can be found using the addDays() and addSecs() functions. Correspondingly, the number of days or seconds between two times can be found using the daysTo() or secsTo() functions.
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 limitations regarding range and resolution mentioned in the QDate and QTime documentation apply for QDateTime also.
Constructs a null datetime (i.e. null date and null time). A null datetime is invalid, since the date is invalid.
See also isValid().
Constructs a datetime with date date and null time (00:00:00.000).
Constructs a datetime with date date and time time.
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() and addSecs().
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() and addDays().
[static]Returns the current datetime, as reported by the system clock.
See also QDate::currentDate() and QTime::currentTime().
Returns the date part of this datetime.
See also setDate() and time().
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().
Returns TRUE if both the date and the time are null. A null date is invalid.
See also QDate::isNull() and QTime::isNull().
Returns TRUE if both the date and the time are valid.
See also QDate::isValid() and QTime::isValid().
Returns TRUE if this datetime is different from dt, or FALSE if they are equal.
See also operator==().
Returns TRUE if this datetime is earlier than dt, otherwise FALSE.
Returns TRUE if this datetime is earlier than or equal to dt, otherwise FALSE.
Returns TRUE if this datetime is equal to dt, or FALSE if they are different.
See also operator!=().
Returns TRUE if this datetime is later than dt, otherwise FALSE.
Returns TRUE if this datetime is later than or equal to dt, otherwise FALSE.
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 x( QDate(dt.year(),12,24), QTime(17,00) );
qDebug( "There are %d seconds to Christmas", dt.secsTo(x) );
See also addSecs(), daysTo() and QTime::secsTo().
Sets the date part of this datetime.
See also date() and setTime().
Sets the time part of this datetime.
See also time() and setDate().
Sets the local date and time given the number of seconds that have passed since 00:00:00 on January 1, 1970, Coordinated Universal Time (UTC). On systems that do not support timezones this function will behave as if local time were UTC.
Note that Microsoft Windows supports only a limited range of values for secsSince1Jan1970UTC.
Returns the time part of this datetime.
See also setTime() and date().
Returns the datetime as a string.
The string format is "Sat May 20 03:40:13 1998".
This function uses QDate::dayName(), QDate::monthName(), and QTime::toString() to generate the string.
Writes a datetime to the stream.
See also Format of the QDataStream operators
Reads a datetime from the stream.
See also Format of the QDataStream operators
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