QTime ¶

概要 ¶

详细描述 ¶

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 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.

hour() , minute() , second() ，和 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() 函数。

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.

另请参阅

QDate QDateTime

class QTime ¶

QTime(QTime)

QTime(h, m[, s=0[, ms=0]])

param h

int

param m

int

param ms

int

param s

int

param QTime

QTime

构造 null 时间对象。对于 null 时间， isNull() 返回 true and isValid() 返回 false . If you need a zero time, use QTime (0, 0). For the start of a day, see startOfDay() .

另请参阅

isNull() isValid()

构造时间采用小时 h ，分钟 m ，秒 s 和毫秒 ms .

h 必须在范围 0 到 23， m and s 必须在范围 0 到 59，和 ms 必须在范围 0 到 999。

另请参阅

isValid()

PySide2.QtCore.QTime. TimeFlag ¶

PySide2.QtCore.QTime. __reduce__ ( ) ¶

返回类型

PyObject

PySide2.QtCore.QTime. __repr__ ( ) ¶

返回类型

PyObject

PySide2.QtCore.QTime. addMSecs ( ms ) ¶

参数

ms – int

返回类型

QTime

返回 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() 范例。

返回 null 时间若此时间无效。

另请参阅

addSecs() msecsTo() addMSecs()

PySide2.QtCore.QTime. addSecs ( secs ) ¶

参数

secs – int

返回类型

QTime

返回 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.

返回 null 时间若此时间无效。

范例：

n = QTime(14, 0, 0)              # n == 14:00:00
t = QTime()
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
											

另请参阅

addMSecs() secsTo() addSecs()

static PySide2.QtCore.QTime. currentTime ( ) ¶

返回类型

QTime

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, 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.

另请参阅

currentDateTime() currentDateTimeUtc()

PySide2.QtCore.QTime. elapsed ( ) ¶

返回类型

int

注意

此函数被弃用。

Returns the number of milliseconds that have elapsed since the last time start() or restart() was called.

Note that the counter wraps to zero 24 hours after the last call to start() or restart.

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

警告

If the system’s clock setting has been changed since the last time start() or restart() was called, the result is undefined. This can happen when daylight-saving time is turned on or off.

另请参阅

start() restart()

static PySide2.QtCore.QTime. fromMSecsSinceStartOfDay ( msecs ) ¶

参数

msecs – int

返回类型

QTime

返回新 QTime instance with the time set to the number of msecs since the start of the day, i.e. since 00:00:00.

若 msecs falls outside the valid range an invalid QTime 将被返回。

另请参阅

msecsSinceStartOfDay()

static PySide2.QtCore.QTime. fromString ( s [ , f=Qt.TextDate ] ) ¶

参数

• s – unicode

• f – DateFormat

返回类型

QTime

static PySide2.QtCore.QTime. fromString ( s , format ) ¶

参数

• s – unicode

• format – unicode

返回类型

QTime

PySide2.QtCore.QTime. hour ( ) ¶

返回类型

int

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

返回 -1，若时间无效。

另请参阅

minute() second() msec()

PySide2.QtCore.QTime. isNull ( ) ¶

返回类型

bool

返回 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.

另请参阅

isValid()

PySide2.QtCore.QTime. isValid ( ) ¶

返回类型

bool

返回 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.

另请参阅

isNull()

static PySide2.QtCore.QTime. isValid ( h , m , s [ , ms=0 ] ) ¶

参数

• h – int

• m – int

• s – int

• ms – int

返回类型

bool

这是重载函数。

返回 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.

范例：

QTime.isValid(21, 10, 30) # returns True
QTime.isValid(22, 5,  62) # returns False
											

PySide2.QtCore.QTime. minute ( ) ¶

返回类型

int

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

返回 -1，若时间无效。

另请参阅

hour() second() msec()

PySide2.QtCore.QTime. msec ( ) ¶

返回类型

int

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

返回 -1，若时间无效。

另请参阅

hour() minute() second()

PySide2.QtCore.QTime. msecsSinceStartOfDay ( ) ¶

返回类型

int

Returns the number of msecs since the start of the day, i.e. since 00:00:00.

另请参阅

fromMSecsSinceStartOfDay()

PySide2.QtCore.QTime. msecsTo ( arg__1 ) ¶

参数

arg__1 – QTime

返回类型

int

Returns the number of milliseconds from this time to t 。若 t is earlier than this time, the number of milliseconds returned is negative.

因为 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.

另请参阅

secsTo() addMSecs() msecsTo()

PySide2.QtCore.QTime. __ne__ ( other ) ¶

参数

other – QTime

返回类型

bool

返回 true if this time is different from t ；否则返回 false .

PySide2.QtCore.QTime. __lt__ ( other ) ¶

参数

other – QTime

返回类型

bool

PySide2.QtCore.QTime. __le__ ( other ) ¶

参数

other – QTime

返回类型

bool

PySide2.QtCore.QTime. __eq__ ( other ) ¶

参数

other – QTime

返回类型

bool

返回 true 若此时间等于 t ；否则返回 false .

PySide2.QtCore.QTime. __gt__ ( other ) ¶

参数

other – QTime

返回类型

bool

返回 true 若此时间晚于 t ；否则返回 false .

PySide2.QtCore.QTime. __ge__ ( other ) ¶

参数

other – QTime

返回类型

bool

返回 true 若此时间 >= t ；否则返回 false .

PySide2.QtCore.QTime. restart ( ) ¶

返回类型

int

注意

此函数被弃用。

Sets this time to the current time and returns the number of milliseconds that have elapsed since the last time start() or was called.

This function is guaranteed to be atomic and is thus very handy for repeated measurements. Call start() to start the first measurement, and for each later measurement.

Note that the counter wraps to zero 24 hours after the last call to start() or .

警告

If the system’s clock setting has been changed since the last time start() or was called, the result is undefined. This can happen when daylight-saving time is turned on or off.

另请参阅

start() elapsed() currentTime()

PySide2.QtCore.QTime. second ( ) ¶

返回类型

int

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

返回 -1，若时间无效。

另请参阅

hour() minute() msec()

PySide2.QtCore.QTime. secsTo ( arg__1 ) ¶

参数

arg__1 – QTime

返回类型

int

Returns the number of seconds from this time to t 。若 t is earlier than this time, the number of seconds returned is negative.

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

does not take into account any milliseconds.

Returns 0 if either time is invalid.

另请参阅

addSecs() secsTo()

PySide2.QtCore.QTime. setHMS ( h , m , s [ , ms=0 ] ) ¶

参数

• h – int

• m – int

• s – int

• ms – int

返回类型

bool

Sets the time to hour h ，分钟 m ，秒 s 和毫秒 ms .

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

另请参阅

isValid()

PySide2.QtCore.QTime. start ( ) ¶

注意

此函数被弃用。

Sets this time to the current time. This is practical for timing:

t = QTime()
t.start()
some_lengthy_task()
print ("Time elapsed: %d ms" % t.elapsed())
											

另请参阅

restart() elapsed() currentTime()

PySide2.QtCore.QTime. toPython ( ) ¶

返回类型

PyObject

PySide2.QtCore.QTime. toString ( [ f=Qt.TextDate ] ) ¶

参数

f – DateFormat

返回类型

unicode

这是重载函数。

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

若 format is TextDate , the string format is HH:mm:ss; e.g. 1 second before midnight would be “23:59:59”.

若 format is ISODate , the string format corresponds to the ISO 8601 extended specification for representations of dates, represented by HH:mm:ss. To include milliseconds in the ISO 8601 date, use the format ISODateWithMs , which corresponds to HH:mm:ss.zzz.

format options SystemLocaleDate :, SystemLocaleShortDate and SystemLocaleLongDate shall be removed in Qt 6. Their use should be replaced with: ShortFormat) or LongFormat) .

format options LocaleDate , DefaultLocaleShortDate and DefaultLocaleLongDate shall be removed in Qt 6. Their use should be replaced with: ShortFormat) or LongFormat) .

若 format is RFC2822Date , the string is formatted in an RFC 2822 compatible way. An example of this formatting is “23:59:20”.

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

另请参阅

fromString() toString() toString() toString()

PySide2.QtCore.QTime. toString ( format ) ¶

参数

format – unicode

返回类型

unicode