QTime Class Reference

\inmodule QtCore \reentrant More...

#include <qdatetime.h>

Collaboration diagram for QTime:

Public Member Functions
constexpr	QTime ()
	Constructs a null time object.
	QTime (int h, int m, int s=0, int ms=0)
	Constructs a time with hour h, minute m, seconds s and milliseconds ms.
constexpr bool	isNull () const
	Returns true if the time is null (i.e., the QTime object was constructed using the default constructor); otherwise returns false.
bool	isValid () const
	Returns true if the time is valid; otherwise returns false.
int	hour () const
	Returns the hour part (0 to 23) of the time.
int	minute () const
	Returns the minute part (0 to 59) of the time.
int	second () const
	Returns the second part (0 to 59) of the time.
int	msec () const
	Returns the millisecond part (0 to 999) of the time.
bool	setHMS (int h, int m, int s, int ms=0)
	Sets the time to hour h, minute m, seconds s and milliseconds ms.
QTime	addSecs (int secs) const
	Returns a QTime object containing a time s seconds later than the time of this object (or earlier if s is negative).
int	secsTo (QTime t) const
	Returns the number of seconds from this time to t.
QTime	addMSecs (int ms) const
	Returns a QTime object containing a time ms milliseconds later than the time of this object (or earlier if ms is negative).
int	msecsTo (QTime t) const
	Returns the number of milliseconds from this time to t.
constexpr int	msecsSinceStartOfDay () const
	Returns the number of msecs since the start of the day, i.e.

Static Public Member Functions
static constexpr QTime	fromMSecsSinceStartOfDay (int msecs)
	Returns a new QTime instance with the time set to the number of msecs since the start of the day, i.e.
static QTime	currentTime ()
	Returns the current time as reported by the system clock.
static bool	isValid (int h, int m, int s, int ms=0)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.Returns true if the specified time is valid; otherwise returns false.

Friends
class	QDateTime
class	QDateTimePrivate
constexpr bool	operator== (QTime lhs, QTime rhs)
	Returns true if lhs is equal to rhs; otherwise returns false.
constexpr bool	operator!= (QTime lhs, QTime rhs)
	Returns true if lhs is different from rhs; otherwise returns false.
constexpr bool	operator< (QTime lhs, QTime rhs)
	Returns true if lhs is earlier than rhs; otherwise returns false.
constexpr bool	operator<= (QTime lhs, QTime rhs)
	Returns true if lhs is earlier than or equal to rhs; otherwise returns false.
constexpr bool	operator> (QTime lhs, QTime rhs)
	Returns true if lhs is later than rhs; otherwise returns false.
constexpr bool	operator>= (QTime lhs, QTime rhs)
	Returns true if lhs is later than or equal to rhs; otherwise returns false.
Q_CORE_EXPORT QDataStream &	operator<< (QDataStream &, QTime)
	Writes time to stream out.
Q_CORE_EXPORT QDataStream &	operator>> (QDataStream &, QTime &)
	Reads a time from stream in into the given time.

Related Symbols
(Note that these are not member symbols.)
QDataStream &	operator<< (QDataStream &out, QTime time)
	Writes time to stream out.
QDataStream &	operator>> (QDataStream &in, QTime &time)
	Reads a time from stream in into the given time.

Detailed Description

\inmodule QtCore \reentrant

The QTime class provides clock time functions.

A QTime object contains a clock time, which it can express as the numbers of hours, minutes, seconds, and milliseconds since midnight. It provides functions for comparing times and for manipulating a time by adding a number of milliseconds. QTime objects should be passed by value rather than by reference to const; they simply package int.

QTime uses the 24-hour clock format; it has no concept of AM/PM. Unlike QDateTime, QTime knows nothing about time zones or daylight-saving time (DST).

A QTime object is typically created either by giving the number of hours, minutes, seconds, and milliseconds explicitly, or by using the static function currentTime(), which creates a QTime object that represents the system's local time.

The hour(), minute(), second(), and msec() functions provide access to the number of hours, minutes, seconds, and milliseconds of the time. The same information is provided in textual format by the toString() function.

The addSecs() and addMSecs() functions provide the time a given number of seconds or milliseconds later than a given time. Correspondingly, the number of seconds or milliseconds between two times can be found using secsTo() or msecsTo().

QTime provides a full set of operators to compare two QTime objects; an earlier time is considered smaller than a later one; if A.msecsTo(B) is positive, then A < B.

QTime objects can also be created from a text representation using fromString() and converted to a string representation using toString(). All conversion to and from string formats is done using the C locale. For localized conversions, see QLocale.

See also

QDate, QDateTime

Definition at line 188 of file qdatetime.h.

Constructor & Destructor Documentation

QTime() [1/2]

QTime::QTime ( )

inlineconstexpr

Constructs a null time object.

For a null time, isNull() returns true and isValid() returns false. If you need a zero time, use QTime(0, 0). For the start of a day, see QDate::startOfDay().

See also

isNull(), isValid()

Definition at line 193 of file qdatetime.h.

QTime() [2/2]

QTime::QTime	(	int	h,
		int	m,
		int	s = 0,
		int	ms = 0
	)

Constructs a time with hour h, minute m, seconds s and milliseconds ms.

h must be in the range 0 to 23, m and s must be in the range 0 to 59, and ms must be in the range 0 to 999.

See also

isValid()

Definition at line 1873 of file qdatetime.cpp.

References setHMS().

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Member Function Documentation

addMSecs()

QTime QTime::addMSecs

(

int

ms

)

const

Returns a QTime object containing a time ms milliseconds later than the time of this object (or earlier if ms is negative).

Note that the time will wrap if it passes midnight. See addSecs() for an example.

Returns a null time if this time is invalid.

See also

addSecs(), msecsTo(), QDateTime::addMSecs()

Definition at line 2197 of file qdatetime.cpp.

References isValid().

Referenced by addSecs(), and operator-().

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addSecs()

QTime QTime::addSecs

(

int

s

)

const

Returns a QTime object containing a time s seconds later than the time of this object (or earlier if s is negative).

Note that the time will wrap if it passes midnight.

Returns a null time if this time is invalid.

Example:

QTime n(14, 0, 0);                // n == 14:00:00
QTime t;
t = n.addSecs(70);                // t == 14:01:10
t = n.addSecs(-70);               // t == 13:58:50
t = n.addSecs(10 * 60 * 60 + 5);  // t == 00:00:05
t = n.addSecs(-15 * 60 * 60);     // t == 23:00:00

See also

addMSecs(), secsTo(), QDateTime::addSecs()

Definition at line 2153 of file qdatetime.cpp.

References addMSecs(), QtPrivate::DateTimeConstants::MSECS_PER_SEC, and QtPrivate::DateTimeConstants::SECS_PER_DAY.

Referenced by toEarliest(), and toLatest().

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currentTime()

QTime::currentTime ( )

static

Returns the current time as reported by the system clock.

Note that the accuracy depends on the accuracy of the underlying operating system; not all systems provide 1-millisecond accuracy.

Furthermore, currentTime() only increases within each day; it shall drop by 24 hours each time midnight passes; and, beside this, changes in it may not correspond to elapsed time, if a daylight-saving transition intervenes.

See also

QDateTime::currentDateTime(), QDateTime::currentDateTimeUtc()

Referenced by QWindowsVistaStylePrivate::animationTime(), QXcbDrag::drop(), QSGOpenVGRenderLoop::renderWindow(), QSGSoftwareRenderLoop::renderWindow(), and QXcbDrag::timerEvent().

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fromMSecsSinceStartOfDay()

QTime QTime::fromMSecsSinceStartOfDay ( int  msecs )

inlinestaticconstexpr

Returns a new QTime instance with the time set to the number of msecs since the start of the day, i.e.

since 00:00:00.

If msecs falls outside the valid range an invalid QTime will be returned.

See also

msecsSinceStartOfDay()

Definition at line 217 of file qdatetime.h.

Referenced by getDateTime(), msecsToTime(), setDateTime(), and QMediaMetaData::stringValue().

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hour()

int QTime::hour

(

)

const

Returns the hour part (0 to 23) of the time.

Returns -1 if the time is invalid.

See also

minute(), second(), msec()

Definition at line 1910 of file qdatetime.cpp.

References isValid(), and QtPrivate::DateTimeConstants::MSECS_PER_HOUR.

Referenced by QOCIDateTime::QOCIDateTime(), QCalendarBackend::dateTimeToString(), QDB2Result::exec(), QODBCResult::exec(), QDB2Driver::formatValue(), QIBaseDriver::formatValue(), QOCIDriver::formatValue(), QV4::Date::init(), operator<<(), QDateTimeParser::setDigit(), QDateTimeEdit::stepBy(), toMySqlDate(), QSystemLocalePrivate::toString(), and writeMSDosDate().

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isNull()

bool QTime::isNull ( ) const

inlineconstexpr

Returns true if the time is null (i.e., the QTime object was constructed using the default constructor); otherwise returns false.

A null time is also an invalid time.

See also

isValid()

Definition at line 197 of file qdatetime.h.

Referenced by jobHoldToString(), and parseDateString().

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isValid() [1/2]

bool QTime::isValid

(

)

const

Returns true if the time is valid; otherwise returns false.

For example, the time 23:30:55.746 is valid, but 24:12:30 is invalid.

See also

isNull()

Definition at line 1896 of file qdatetime.cpp.

References QtPrivate::DateTimeConstants::MSECS_PER_DAY.

Referenced by QDateTimeEdit::QDateTimeEdit(), addMSecs(), QCalendarBackend::dateTimeToString(), QIBaseDriver::formatValue(), QPSQLDriver::formatValue(), QSqlDriver::formatValue(), QLocationUtils::getNmeaTime(), hour(), QV4::Date::init(), minute(), msec(), msecsTo(), msecsTo(), QNmeaPositionInfoSourcePrivate::notifyNewUpdate(), operator<<(), QCUPSSupport::parseJobHoldUntil(), processSentence(), QNmeaRealTimeReader::readAvailableData(), second(), secsTo(), setDateTime(), QDateTimeParser::setDigit(), setHMS(), QDateTimeEdit::setMaximumTime(), QDateTimeEdit::setTime(), QDateTimeEdit::setTimeRange(), timeFromString(), and QLocale::toString().

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isValid() [2/2]

bool QTime::isValid ( int  h, int  m, int  s, int  ms = 0  )

static

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.Returns true if the specified time is valid; otherwise returns false.

The time is valid if h is in the range 0 to 23, m and s are in the range 0 to 59, and ms is in the range 0 to 999.

Example:

QTime::isValid(21, 10, 30); // returns true
QTime::isValid(22, 5,  62); // returns false

Definition at line 2552 of file qdatetime.cpp.

References QtPrivate::DateTimeConstants::MINS_PER_HOUR, QtPrivate::DateTimeConstants::MSECS_PER_SEC, and QtPrivate::DateTimeConstants::SECS_PER_MIN.

minute()

int QTime::minute

(

)

const

Returns the minute part (0 to 59) of the time.

Returns -1 if the time is invalid.

See also

hour(), second(), msec()

Definition at line 1926 of file qdatetime.cpp.

References isValid(), QtPrivate::DateTimeConstants::MSECS_PER_HOUR, and QtPrivate::DateTimeConstants::MSECS_PER_MIN.

Referenced by QOCIDateTime::QOCIDateTime(), QCalendarBackend::dateTimeToString(), QDB2Result::exec(), QODBCResult::exec(), QDB2Driver::formatValue(), QIBaseDriver::formatValue(), QOCIDriver::formatValue(), QV4::Date::init(), operator<<(), QDateTimeParser::setDigit(), QDateTimeEdit::stepBy(), toMySqlDate(), QSystemLocalePrivate::toString(), and writeMSDosDate().

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msec()

int QTime::msec

(

)

const

Returns the millisecond part (0 to 999) of the time.

Returns -1 if the time is invalid.

See also

hour(), minute(), second()

Definition at line 1958 of file qdatetime.cpp.

References isValid(), and QtPrivate::DateTimeConstants::MSECS_PER_SEC.

Referenced by QOCIDateTime::QOCIDateTime(), QCalendarBackend::dateTimeToString(), QDB2Result::exec(), QMimerSQLResult::exec(), QODBCResult::exec(), QDB2Driver::formatValue(), QIBaseDriver::formatValue(), QV4::Date::init(), operator<<(), QDateTimeParser::setDigit(), and toMySqlDate().

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msecsSinceStartOfDay()

int QTime::msecsSinceStartOfDay ( ) const

inlineconstexpr

Returns the number of msecs since the start of the day, i.e.

since 00:00:00.

See also

fromMSecsSinceStartOfDay()

Definition at line 218 of file qdatetime.h.

Referenced by Q_LOGGING_CATEGORY(), setDateTime(), timeToMSecs(), toEarliest(), and toLatest().

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msecsTo()

int QTime::msecsTo

(

QTime

t

)

const

Returns the number of milliseconds from this time to t.

If t is earlier than this time, the number of milliseconds returned is negative.

Because QTime measures time within a day and there are 86400 seconds in a day, the result is always between -86400000 and 86400000 ms.

Returns 0 if either time is invalid.

See also

secsTo(), addMSecs(), QDateTime::msecsTo()

Definition at line 2219 of file qdatetime.cpp.

References isValid().

Referenced by msecsTo(), QDateTimeParser::parse(), QSGOpenVGRenderLoop::renderWindow(), QSGSoftwareRenderLoop::renderWindow(), toTime(), and toTimeStamp().

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second()

int QTime::second

(

)

const

Returns the second part (0 to 59) of the time.

Returns -1 if the time is invalid.

See also

hour(), minute(), msec()

Definition at line 1942 of file qdatetime.cpp.

References isValid(), QtPrivate::DateTimeConstants::MSECS_PER_SEC, and QtPrivate::DateTimeConstants::SECS_PER_MIN.

Referenced by QOCIDateTime::QOCIDateTime(), QCalendarBackend::dateTimeToString(), QDB2Result::exec(), QODBCResult::exec(), QDB2Driver::formatValue(), QIBaseDriver::formatValue(), QOCIDriver::formatValue(), QV4::Date::init(), operator<<(), QDateTimeParser::setDigit(), toMySqlDate(), QSystemLocalePrivate::toString(), and writeMSDosDate().

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secsTo()

int QTime::secsTo

(

QTime

t

)

const

Returns the number of seconds from this time to t.

If t is earlier than this time, the number of seconds returned is negative.

Because QTime measures time within a day and there are 86400 seconds in a day, the result is always between -86400 and 86400.

secsTo() does not take into account any milliseconds.

Returns 0 if either time is invalid.

See also

addSecs(), QDateTime::secsTo()

Definition at line 2174 of file qdatetime.cpp.

References isValid(), and QtPrivate::DateTimeConstants::MSECS_PER_SEC.

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setHMS()

bool QTime::setHMS	(	int	h,
		int	m,
		int	s,
		int	ms = 0
	)

Sets the time to hour h, minute m, seconds s and milliseconds ms.

h must be in the range 0 to 23, m and s must be in the range 0 to 59, and ms must be in the range 0 to 999. Returns true if the set time is valid; otherwise returns false.

See also

isValid()

Definition at line 2127 of file qdatetime.cpp.

References isValid(), QtPrivate::DateTimeConstants::MINS_PER_HOUR, QtPrivate::DateTimeConstants::MSECS_PER_DAY, QtPrivate::DateTimeConstants::MSECS_PER_SEC, Q_ASSERT, and QtPrivate::DateTimeConstants::SECS_PER_MIN.

Referenced by QTime(), and operator>>().

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Friends And Related Symbol Documentation

operator!=

bool QTime::operator!= ( QTime  lhs, QTime  rhs  )

friend

Returns true if lhs is different from rhs; otherwise returns false.

Definition at line 239 of file qdatetime.h.

operator<

bool QTime::operator< ( QTime  lhs, QTime  rhs  )

friend

Returns true if lhs is earlier than rhs; otherwise returns false.

Definition at line 240 of file qdatetime.h.

operator<< [1/2]

QDataStream & operator<< ( QDataStream &  out, QTime  time  )

friend

Writes time to stream out.

See also

{Serializing Qt Data Types}

Definition at line 5451 of file qdatetime.cpp.

operator<<() [2/2]

QDataStream & operator<< ( QDataStream &  out, QTime  time  )

related

Writes time to stream out.

See also

{Serializing Qt Data Types}

Definition at line 5451 of file qdatetime.cpp.

operator<=

bool QTime::operator<= ( QTime  lhs, QTime  rhs  )

friend

Returns true if lhs is earlier than or equal to rhs; otherwise returns false.

Definition at line 241 of file qdatetime.h.

operator==

bool QTime::operator== ( QTime  lhs, QTime  rhs  )

friend

Returns true if lhs is equal to rhs; otherwise returns false.

Definition at line 238 of file qdatetime.h.

operator>

bool QTime::operator> ( QTime  lhs, QTime  rhs  )

friend

Returns true if lhs is later than rhs; otherwise returns false.

Definition at line 242 of file qdatetime.h.

operator>=

bool QTime::operator>= ( QTime  lhs, QTime  rhs  )

friend

Returns true if lhs is later than or equal to rhs; otherwise returns false.

Definition at line 243 of file qdatetime.h.

operator>> [1/2]

QDataStream & operator>> ( QDataStream &  in, QTime &  time  )

friend

Reads a time from stream in into the given time.

See also

{Serializing Qt Data Types}

Definition at line 5469 of file qdatetime.cpp.

operator>>() [2/2]

QDataStream & operator>> ( QDataStream &  in, QTime &  time  )

related

Reads a time from stream in into the given time.

See also

{Serializing Qt Data Types}

Definition at line 5469 of file qdatetime.cpp.

QDateTime

friend class QDateTime

friend

Definition at line 245 of file qdatetime.h.

QDateTimePrivate

friend class QDateTimePrivate

friend

Definition at line 246 of file qdatetime.h.

---

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

• qtbase/src/corelib/time/qdatetime.h
• qtbase/src/corelib/time/qdatetime.cpp