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java.lang.Objectcom.trolltech.qt.internal.QSignalEmitterInternal
com.trolltech.qt.QSignalEmitter
com.trolltech.qt.QtJambiObject
com.trolltech.qt.core.QDateTime
public class QDateTime
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()
that 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 that 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 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.
QDateTime
can store datetimes as local time
or as UTC
. QDateTime::currentDateTime()
returns a QDateTime
expressed as local time; use toUTC()
to convert it to UTC. You can also use timeSpec()
to find out if a QDateTime
object stores a UTC time or a local time. Operations such as addSecs()
and secsTo()
are aware of daylight saving time (DST).
QDate
, QTime
, and QDateTimeEdit
.
Nested Class Summary |
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Nested classes/interfaces inherited from class com.trolltech.qt.QSignalEmitter |
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QSignalEmitter.AbstractSignal, QSignalEmitter.Signal0, QSignalEmitter.Signal1, QSignalEmitter.Signal2, QSignalEmitter.Signal3, QSignalEmitter.Signal4, QSignalEmitter.Signal5, QSignalEmitter.Signal6, QSignalEmitter.Signal7, QSignalEmitter.Signal8, QSignalEmitter.Signal9 |
Nested classes/interfaces inherited from class com.trolltech.qt.internal.QSignalEmitterInternal |
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com.trolltech.qt.internal.QSignalEmitterInternal.AbstractSignalInternal |
Field Summary |
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Fields inherited from class com.trolltech.qt.internal.QSignalEmitterInternal |
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currentSender |
Constructor Summary | |
---|---|
QDateTime()
Constructs a null datetime (i. |
|
QDateTime(QDate arg__1)
Constructs a datetime with the given date, a valid time(00.00:00. |
|
QDateTime(QDate arg__1,
QTime arg__2)
Constructs a datetime with the given date and time, using the time specification defined by spec. |
|
QDateTime(QDate arg__1,
QTime arg__2,
Qt.TimeSpec spec)
Constructs a datetime with the given date and time, using the time specification defined by spec. |
|
QDateTime(QDateTime other)
Constructs a copy of the other datetime. |
Method Summary | |
---|---|
QDateTime |
addDays(int days)
Returns a QDateTime object containing a datetime ndays days later than the datetime of this object (or earlier if ndays is negative). |
QDateTime |
addMonths(int months)
Returns a QDateTime object containing a datetime nmonths months later than the datetime of this object (or earlier if nmonths is negative). |
QDateTime |
addMSecs(long msecs)
Returns a QDateTime object containing a datetime msecs miliseconds later than the datetime of this object (or earlier if msecs is negative). |
QDateTime |
addSecs(int secs)
Returns a QDateTime object containing a datetime s seconds later than the datetime of this object (or earlier if s is negative). |
QDateTime |
addYears(int years)
Returns a QDateTime object containing a datetime nyears years later than the datetime of this object (or earlier if nyears is negative). |
QDateTime |
clone()
This method is reimplemented for internal reasons |
static QDateTime |
currentDateTime()
Returns the current datetime, as reported by the system clock, in the local time zone. |
QDate |
date()
Returns the date part of the datetime. |
int |
daysTo(QDateTime arg__1)
Returns the number of days from this datetime to the other datetime. |
static QDateTime |
fromString(java.lang.String s)
Returns the QDateTime represented by the string, using the format given, or an invalid datetime if this is not possible. |
static QDateTime |
fromString(java.lang.String s,
Qt.DateFormat f)
Returns the QDateTime represented by the string, using the format given, or an invalid datetime if this is not possible. |
static QDateTime |
fromString(java.lang.String s,
java.lang.String format)
Returns the QDateTime represented by the string, using the format given, or an invalid datetime if the string cannot be parsed. |
static QDateTime |
fromTime_t(int secsSince1Jan1970UTC)
Returns a datetime whose date and time are the number of seconds that have passed since 1970-01-01T00.00:00, Coordinated Universal Time ( Qt::UTC ). |
boolean |
isNull()
Returns true if both the date and the time are null; otherwise returns false. |
boolean |
isValid()
Returns true if both the date and the time are valid; otherwise returns false. |
void |
readFrom(QDataStream arg__1)
|
int |
secsTo(QDateTime arg__1)
Returns the number of seconds from this datetime to the other datetime. |
void |
setDate(QDate date)
Sets the date part of this datetime to date. |
void |
setTime_t(int secsSince1Jan1970UTC)
Sets the date and time given the number of seconds that have passed since 1970-01-01T00.00:00, Coordinated Universal Time ( Qt::UTC ). |
void |
setTime(QTime time)
Sets the time part of this datetime to time. |
void |
setTimeSpec(Qt.TimeSpec spec)
Sets the time specification used in this datetime to spec. |
QTime |
time()
Returns the time part of the datetime. |
Qt.TimeSpec |
timeSpec()
Returns the time specification of the datetime. |
QDateTime |
toLocalTime()
Returns a datetime containing the date and time information in this datetime, but specified using the Qt::LocalTime definition. |
java.lang.String |
toString()
|
java.lang.String |
toString(Qt.DateFormat f)
|
java.lang.String |
toString(java.lang.String format)
|
int |
toTime_t()
Returns the datetime as the number of seconds that have passed since 1970-01-01T00.00:00, Coordinated Universal Time ( Qt::UTC ). |
QDateTime |
toTimeSpec(Qt.TimeSpec spec)
Returns a copy of this datetime configured to use the given time specification. |
QDateTime |
toUTC()
Returns a datetime containing the date and time information in this datetime, but specified using the Qt::UTC definition. |
void |
writeTo(QDataStream arg__1)
|
Methods inherited from class com.trolltech.qt.QtJambiObject |
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dispose, disposed, equals, finalize, reassignNativeResources, tr, tr, tr |
Methods inherited from class com.trolltech.qt.QSignalEmitter |
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blockSignals, disconnect, disconnect, signalsBlocked, signalSender, thread |
Methods inherited from class com.trolltech.qt.internal.QSignalEmitterInternal |
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__qt_signalInitialization |
Methods inherited from class java.lang.Object |
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getClass, hashCode, notify, notifyAll, wait, wait, wait |
Methods inherited from interface java.lang.Comparable |
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compareTo |
Methods inherited from interface com.trolltech.qt.QtJambiInterface |
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disableGarbageCollection, nativeId, nativePointer, reenableGarbageCollection, setJavaOwnership |
Constructor Detail |
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public QDateTime()
isValid()
.
public QDateTime(QDate arg__1)
timeSpec()
to Qt::LocalTime
.
public QDateTime(QDate arg__1, QTime arg__2)
If date is valid and time is not, the time will be set to midnight.
public QDateTime(QDate arg__1, QTime arg__2, Qt.TimeSpec spec)
If date is valid and time is not, the time will be set to midnight.
public QDateTime(QDateTime other)
Method Detail |
---|
public final QDateTime addDays(int days)
QDateTime
object containing a datetime ndays days later than the datetime of this object (or earlier if ndays is negative). daysTo()
, addMonths()
, addYears()
, and addSecs()
.
public final QDateTime addMSecs(long msecs)
QDateTime
object containing a datetime msecs miliseconds later than the datetime of this object (or earlier if msecs is negative). addSecs()
, secsTo()
, addDays()
, addMonths()
, and addYears()
.
public final QDateTime addMonths(int months)
QDateTime
object containing a datetime nmonths months later than the datetime of this object (or earlier if nmonths is negative). daysTo()
, addDays()
, addYears()
, and addSecs()
.
public final QDateTime addSecs(int secs)
QDateTime
object containing a datetime s seconds later than the datetime of this object (or earlier if s is negative). addMSecs()
, secsTo()
, addDays()
, addMonths()
, and addYears()
.
public final QDateTime addYears(int years)
QDateTime
object containing a datetime nyears years later than the datetime of this object (or earlier if nyears is negative). daysTo()
, addDays()
, addMonths()
, and addSecs()
.
public final QDate date()
setDate()
, time()
, and timeSpec()
.
public final int daysTo(QDateTime arg__1)
addDays()
, and secsTo()
.
public final boolean isNull()
QDate::isNull()
, QTime::isNull()
, and isValid()
.
public final boolean isValid()
QDate::isValid()
, and QTime::isValid()
.
public final void writeTo(QDataStream arg__1)
public final void readFrom(QDataStream arg__1)
public final int secsTo(QDateTime arg__1)
Before performing the comparison, the two datetimes are converted to Qt::UTC
to ensure that the result is correct if one of the two datetimes has daylight saving time (DST) and the other doesn't.
Example:
QDateTime now = QDateTime.currentDateTime(); QDateTime xmas = new QDateTime(new QDate(now.date().year(), 12, 25), new QTime(0, 0)); System.err.println("There are " + now.secsTo(xmas) + "seconds to Christmas");
addSecs()
, daysTo()
, and QTime::secsTo()
.
public final void setDate(QDate date)
date()
, setTime()
, and setTimeSpec()
.
public final void setTime(QTime time)
time()
, setDate()
, and setTimeSpec()
.
public final void setTimeSpec(Qt.TimeSpec spec)
timeSpec()
, setDate()
, setTime()
, and Qt::TimeSpec
.
public final void setTime_t(int secsSince1Jan1970UTC)
Qt::UTC
). On systems that do not support timezones this function will behave as if local time were Qt::UTC
. toTime_t()
.
public final QTime time()
setTime()
, date()
, and timeSpec()
.
public final Qt.TimeSpec timeSpec()
setTimeSpec()
, date()
, time()
, and Qt::TimeSpec
.
public final QDateTime toLocalTime()
Qt::LocalTime
definition. toTimeSpec()
.
public final java.lang.String toString()
toString
in class java.lang.Object
public final java.lang.String toString(Qt.DateFormat f)
public final java.lang.String toString(java.lang.String format)
public final QDateTime toTimeSpec(Qt.TimeSpec spec)
timeSpec()
, toUTC()
, and toLocalTime()
.
public final int toTime_t()
Qt::UTC
). On systems that do not support timezones, this function will behave as if local time were Qt::UTC
.
setTime_t()
.
public final QDateTime toUTC()
Qt::UTC
definition. toTimeSpec()
.
public static QDateTime currentDateTime()
QDate::currentDate()
, QTime::currentTime()
, and toTimeSpec()
.
public static QDateTime fromString(java.lang.String s)
QDateTime
represented by the string, using the format given, 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.
public static QDateTime fromString(java.lang.String s, Qt.DateFormat f)
QDateTime
represented by the string, using the format given, 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.
public static QDateTime fromString(java.lang.String s, java.lang.String format)
QDateTime
represented by the string, using the format given, or an invalid datetime if the string cannot be parsed. These expressions may be used for the date part of the format string:
d | the day as number without a leading zero (1 to 31) |
dd | the day as number with a leading zero (01 to 31) |
ddd | the abbreviated localized day name (e.g. 'Mon' to 'Sun'). Uses QDate::shortDayName() . |
dddd | the long localized day name (e.g. 'Monday' to 'Sunday'). Uses QDate::longDayName() . |
M | the month as number without a leading zero (1-12) |
MM | the month as number with a leading zero (01-12) |
MMM | the abbreviated localized month name (e.g. 'Jan' to 'Dec'). Uses QDate::shortMonthName() . |
MMMM | the long localized month name (e.g. 'January' to 'December'). Uses QDate::longMonthName() . |
yy | the year as two digit number (00-99) |
yyyy | the year as four digit number |
These expressions may be used for the time part of the format string:
h | the hour without a leading zero (0 to 23 or 1 to 12 if AM/PM display) |
hh | the hour with a leading zero (00 to 23 or 01 to 12 if AM/PM display) |
H | the hour without a leading zero (0 to 23, even with AM/PM display) |
HH | the hour with a leading zero (00 to 23, even with AM/PM display) |
m | the minute without a leading zero (0 to 59) |
mm | the minute with a leading zero (00 to 59) |
s | the second without a leading zero (0 to 59) |
ss | the second with a leading zero (00 to 59) |
z | the milliseconds without leading zeroes (0 to 999) |
zzz | the milliseconds with leading zeroes (000 to 999) |
AP or A | interpret as an AM/PM time. AP must be either "AM" or "PM". |
ap or a | Interpret as an AM/PM time. ap must be either "am" or "pm". |
QTime time1 = QTime.fromString("131", "HHh"); // time1 is 13:00:00 QTime time2 = QTime.fromString("1apA", "1amAM"); // time1 is 01:00:00 QDateTime dateTime2 = QDateTime.fromString("M1d1y9800:01:02", "'M'M'd'd'y'yyhh:mm:ss"); // dateTime is 1 January 1998 00:01:02If the format is not satisfied an invalid
QDateTime
is returned. The expressions that don't have leading zeroes (d, M, h, m, s, z) will be greedy. This means that they will use two digits even if this will put them outside the range and/or leave too few digits for other sections. QDateTime dateTime = QDateTime.fromString("130", "Mm"); // invalidThis could have meant 1 January 00:30.00 but the M will grab two digits.
For any field that is not represented in the format the following defaults are used:
Year | 1900 |
Month | 1 (January) |
Day | 1 |
Hour | 0 |
Minute | 0 |
Second | 0 |
QDateTime dateTime = QDateTime.fromString("1.30.1", "M.d.s"); // dateTime is January 30 in the current year 00:00:01
QDateTime::toString()
QTime::toString()
QDate::fromString()
, QTime::fromString()
, and QDate::toString()
.
public static QDateTime fromTime_t(int secsSince1Jan1970UTC)
Qt::UTC
). On systems that do not support timezones, the time will be set as if local time were Qt::UTC
. toTime_t()
, and setTime_t()
.
public QDateTime clone()
clone
in class java.lang.Object
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