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java.lang.Objectcom.trolltech.qt.QSignalEmitter
com.trolltech.qt.QtJambiObject
com.trolltech.qt.core.QDate
public class QDate
The QDate class provides date functions.
A QDate object contains a calendar date, i.e. year, month, and day numbers, in the Gregorian calendar (Julian calendar for dates before 15 October 1582). It can read the current date from the system clock. It provides functions for comparing dates, and for manipulating dates. For example, it is possible to add and subtract days, months, and years to dates.
A QDate object is typically created either by giving the year, month, and day numbers explicitly, or by using the static function currentDate that creates a QDate object containing the system clock's date. An explicit date can also be set using setDate. The fromString function returns a QDate given a string and a date format which is used to interpret the date within the string.
The year, month, and day functions provide access to the year, month, and day numbers. Also, dayOfWeek and dayOfYear functions are provided. The same information is provided in textual format by the toString, shortDayName, longDayName, shortMonthName, and longMonthName functions.
QDate provides a full set of operators to compare two QDate objects where smaller means earlier, and larger means later.
You can increment (or decrement) a date by a given number of days using addDays. Similarly you can use addMonths and addYears. The daysTo function returns the number of days between two dates.
The daysInMonth and daysInYear functions return how many days there are in this date's month and year, respectively. The isLeapYear function indicates whether this date is in a leap year.
Note that the Gregorian calendar was introduced at different dates in different countries and regions. QDate uses the Gregorian calendar starting from 15 October 1582, and uses the Julian calendar for dates up to 4 October 1582.
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<A>, QSignalEmitter.Signal2<A,B>, QSignalEmitter.Signal3<A,B,C>, QSignalEmitter.Signal4<A,B,C,D>, QSignalEmitter.Signal5<A,B,C,D,E>, QSignalEmitter.Signal6<A,B,C,D,E,F>, QSignalEmitter.Signal7<A,B,C,D,E,F,G>, QSignalEmitter.Signal8<A,B,C,D,E,F,G,H>, QSignalEmitter.Signal9<A,B,C,D,E,F,G,H,I> |
Constructor Summary | |
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QDate()
Constructs a null date. |
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QDate(int y,
int m,
int d)
Constructs a date with year y, month m and day d. |
Method Summary | |
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QDate |
addDays(int days)
Returns a QDate object containing a date days later than the date of this object (or earlier if days is negative). |
QDate |
addMonths(int months)
Returns a QDate object containing a date months later than the date of this object (or earlier if months is negative). |
QDate |
addYears(int years)
Returns a QDate object containing a date years later than the date of this object (or earlier if years is negative). |
int |
compareTo(java.lang.Object other)
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static QDate |
currentDate()
Returns the current date, as reported by the system clock. |
int |
day()
Returns the day of the month (1 to 31) of this date. |
int |
dayOfWeek()
Returns the weekday (1 to 7) for this date. |
int |
dayOfYear()
Returns the day of the year (1 to 365) for this date. |
int |
daysInMonth()
Returns the number of days in the month (28 to 31) for this date. |
int |
daysInYear()
Returns the number of days in the year (365 or 366) for this date. |
int |
daysTo(QDate arg__1)
Returns the number of days from this date to arg__1 (which is negative if arg__1 is earlier than this date). |
boolean |
equals(java.lang.Object other)
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static QDate |
fromJulianDay(int jd)
Converts the Julian day jd to a QDate. |
static QDate |
fromNativePointer(QNativePointer nativePointer)
This function returns the QDate instance pointed to by nativePointer |
static QDate |
fromString(java.lang.String s)
Equivalent to fromString(s, Qt::TextDate). |
static QDate |
fromString(java.lang.String s,
Qt.DateFormat f)
Returns the QDate represented by the s, using the f given, or an invalid date if the string cannot be parsed. |
static QDate |
fromString(java.lang.String s,
java.lang.String format)
Returns the QDate represented by the s, using the format given, or an invalid date if the string cannot be parsed. |
static int |
gregorianToJulian(int y,
int m,
int d)
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static boolean |
isLeapYear(int year)
Returns true if the specified year is a leap year; otherwise returns false. |
boolean |
isNull()
Returns true if the date is null; otherwise returns false. |
boolean |
isValid()
Returns true if this date is valid; otherwise returns false. |
static boolean |
isValid(int y,
int m,
int d)
Returns true if the specified date (y, m, and d) is valid; otherwise returns false. |
static java.lang.String |
longDayName(int weekday)
Returns the long name of the weekday using the following convention: |
static java.lang.String |
longMonthName(int month)
Returns the long name of the month using the following convention: |
int |
month()
Returns the number corresponding to the month of this date, using the following convention: |
static QNativePointer |
nativePointerArray(QDate[] array)
This function returns a QNativePointer that is pointing to the specified QDate array. |
void |
readFrom(QDataStream arg__1)
Reads a QDate from arg__1. |
boolean |
setDate(int year,
int month,
int date)
Sets the date's year, month, and date. |
static java.lang.String |
shortDayName(int weekday)
Returns the name of the weekday using the following convention: |
static java.lang.String |
shortMonthName(int month)
Returns the name of the month using the following convention: |
int |
toJulianDay()
Converts the date to a Julian day. |
java.lang.String |
toString()
Equivalent to toString(Qt::TextDate). |
java.lang.String |
toString(Qt.DateFormat f)
Returns the date as a string. |
java.lang.String |
toString(java.lang.String format)
Returns the date as a string. |
int |
weekNumber()
Returns the week number (1 to 53). |
void |
writeTo(QDataStream arg__1)
Writes thisQDate to arg__1. |
int |
year()
Returns the year of this date. |
int |
yearOfWeekNumber()
This function returns the year number of the QDate's current week. |
Methods inherited from class com.trolltech.qt.QtJambiObject |
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dispose, disposed, 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 java.lang.Object |
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clone, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Methods inherited from interface com.trolltech.qt.QtJambiInterface |
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disableGarbageCollection, nativeId, nativePointer, reenableGarbageCollection, setJavaOwnership |
Constructor Detail |
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public QDate()
Constructs a null date. Null dates are invalid.
public QDate(int y, int m, int d)
Constructs a date with year y, month m and day d.
If the specified date is invalid, the date is not set and isValid returns false. Any date before 2 January 4713 B.C. is considered invalid.
Warning: Years 0 to 99 are interpreted as is. If you want to specify the year 2010, you must write 2010, not 10.
Method Detail |
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public final QDate addDays(int days)
Returns a QDate object containing a date days later than the date of this object (or earlier if days is negative).
public final QDate addMonths(int months)
Returns a QDate object containing a date months later than the date of this object (or earlier if months is negative).
public final QDate addYears(int years)
Returns a QDate object containing a date years later than the date of this object (or earlier if years is negative).
public final int day()
Returns the day of the month (1 to 31) of this date.
public final int dayOfWeek()
Returns the weekday (1 to 7) for this date.
public final int dayOfYear()
Returns the day of the year (1 to 365) for this date.
public final int daysInMonth()
Returns the number of days in the month (28 to 31) for this date.
public final int daysInYear()
Returns the number of days in the year (365 or 366) for this date.
public final int daysTo(QDate arg__1)
Returns the number of days from this date to arg__1 (which is negative if arg__1 is earlier than this date).
Example:
QDate d1(1995, 5, 17); // May 17, 1995 QDate d2(1995, 5, 20); // May 20, 1995 d1.daysTo(d2); // returns 3 d2.daysTo(d1); // returns -3
public final boolean isNull()
Returns true if the date is null; otherwise returns false. A null date is invalid.
public final boolean isValid()
Returns true if this date is valid; otherwise returns false.
public final int month()
Returns the number corresponding to the month of this date, using the following convention:
public final void writeTo(QDataStream arg__1)
public final void readFrom(QDataStream arg__1)
public final boolean setDate(int year, int month, int date)
Sets the date's year, month, and date. Returns true if the date is valid; otherwise returns false.
If the specified date is invalid, the QDate object is set to be invalid. Any date before 2 January 4713 B.C. is considered invalid.
public final int toJulianDay()
Converts the date to a Julian day.
public final java.lang.String toString()
Equivalent to toString(Qt::TextDate).
toString
in class java.lang.Object
public final java.lang.String toString(Qt.DateFormat f)
Returns the date as a string. The f parameter determines the format of the string.
If the f is Qt::TextDate, the string is formatted in the default way. QDate::shortDayName() and QDate::shortMonthName() are used to generate the string, so the day and month names will be localized names. An example of this formatting is "Sat May 20 1995".
If the f is Qt::ISODate, the string format corresponds to the ISO 8601 extended specification for representations of dates and times, taking the form YYYY-MM-DD, where YYYY is the year, MM is the month of the year (between 01 and 12), and DD is the day of the month between 01 and 31.
If the f is Qt::LocalDate or Qt::SystemLocaleDate, the string format depends on the locale settings of the system. Identical to calling QLocale::system().toString(date, QLocale::ShortFormat). Qt::LocalDate has been deprecated, please use Qt::SystemLocaleDate instead.
If the f is Qt::LocaleDate, the string format depends on the default application locale. This is the locale set with QLocale::setDefault(), or the system locale if no default locale has been set. Identical to calling QLocale().toString(date, QLocale::ShortFormat);
If the datetime is invalid, an empty string will be returned.
Warning: The Qt::ISODate format is only valid for years in the range 0 to 9999. This restriction may apply to Qt::LocalDate as well, depending on the locale settings.
public final java.lang.String toString(java.lang.String format)
Returns the date as a string. The format parameter determines the format of the result string.
These expressions may be used:
Expression | Output |
---|---|
d | the day as number without a leading zero (1 to31) |
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. 'Qt::Monday' to 'Qt::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 to 99) |
yyyy | the year as four digit number |
All other input characters will be ignored. Any sequence of characters that are enclosed in singlequotes will be treated as text and not be used as an expression. Two consecutive singlequotes ("''") are replaced by a singlequote in the output.
Example format strings (assuming that the QDate is the 20 July 1969):
Format | Result |
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dd.MM.yyyy | 20.07.1969 |
ddd MMMM d yy | Sun July 20 69 |
'The day is' dddd | The day is Sunday |
If the datetime is invalid, an empty string will be returned.
Warning: This function is only valid for years in the range 0 to 9999.
public final int year()
Returns the year of this date. Negative numbers indicate years before 1 A.D. = 1 C.E., such that year -44 is 44 B.C.
public static QDate currentDate()
Returns the current date, as reported by the system clock.
public static QDate fromJulianDay(int jd)
Converts the Julian day jd to a QDate.
public static QDate fromString(java.lang.String s, java.lang.String format)
Returns the QDate represented by the s, using the format given, or an invalid date if the string cannot be parsed.
These expressions may be used for the format:
Expression | Output |
---|---|
d | The day as a number without a leading zero (1 to 31) |
dd | The day as a 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 a number without a leading zero (1 to 12) |
MM | The month as a number with a leading zero (01 to 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 to 99) |
yyyy | The year as four digit number |
All other input characters will be treated as text. Any sequence of characters that are enclosed in single quotes will also be treated as text and will not be used as an expression. For example:
QDate date = QDate::fromString("1MM12car2003", "d'MM'MMcaryyyy");
// date is 1 December 2003
If the format is not satisfied, an invalid QDate is returned. The expressions that don't expect leading zeroes (d, M) will be greedy. This means that they will use two digits even if this will put them outside the accepted range of values and leaves too few digits for other sections. For example, the following format string could have meant January 30 but the M will grab two digits, resulting in an invalid date:
QDate date = QDate::fromString("130", "Md"); // invalid
For any field that is not represented in the format the following defaults are used:
Field | Default value |
---|---|
Year | 1900 |
Month | 1 |
Day | 1 |
The following examples demonstrate the default values:
QDate::fromString("1.30", "M.d"); // January 30 1900 QDate::fromString("20000110", "yyyyMMdd"); // January 10, 2000 QDate::fromString("20000110", "yyyyMd"); // January 10, 2000
public static QDate fromString(java.lang.String s)
Equivalent to fromString(s, Qt::TextDate).
public static QDate fromString(java.lang.String s, Qt.DateFormat f)
Returns the QDate represented by the s, using the f given, or an invalid date if the string cannot be parsed.
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: Qt::LocalDate cannot be used here.
public static int gregorianToJulian(int y, int m, int d)
public static boolean isLeapYear(int year)
Returns true if the specified year is a leap year; otherwise returns false.
public static boolean isValid(int y, int m, int d)
Returns true if the specified date (y, m, and d) is valid; otherwise returns false.
Example:
QDate::isValid(2002, 5, 17); // true QDate::isValid(2002, 2, 30); // false (Feb 30 does not exist) QDate::isValid(2004, 2, 29); // true (2004 is a leap year) QDate::isValid(2000, 2, 29); // true (2000 is a leap year) QDate::isValid(2006, 2, 29); // false (2006 is not a leap year) QDate::isValid(2100, 2, 29); // false (2100 is not a leap year) QDate::isValid(1202, 6, 6); // true (even though 1202 is pre-Gregorian)
public static java.lang.String longDayName(int weekday)
Returns the long name of the weekday using the following convention:
The day names will be localized according to the system's locale settings.
public static java.lang.String longMonthName(int month)
Returns the long name of the month using the following convention:
The month names will be localized according to the system's locale settings.
public static java.lang.String shortDayName(int weekday)
Returns the name of the weekday using the following convention:
The day names will be localized according to the system's locale settings.
public static java.lang.String shortMonthName(int month)
Returns the name of the month using the following convention:
The month names will be localized according to the system's locale settings.
public static QDate fromNativePointer(QNativePointer nativePointer)
nativePointer
- the QNativePointer of which object should be returned.public static QNativePointer nativePointerArray(QDate[] array)
array
- the array that the returned pointer will point to.
public boolean equals(java.lang.Object other)
equals
in class java.lang.Object
public int compareTo(java.lang.Object other)
compareTo
in interface java.lang.Comparable
public final int weekNumber()
Returns null if the date is invalid.
In accordance with ISO 8601, weeks start on Qt.DayOfWeek.Monday and the first Qt.DayOfWeek.Thursday of a year is always in week 1 of that year. Most years have 52 weeks, but some have 53.
Copyright (c) 1989 The Regents of the University of California. All rights reserved.
Redistribution and use in source and binary forms are permitted provided that the above copyright notice and this paragraph are duplicated in all such forms and that any documentation, advertising materials, and other materials related to such distribution and use acknowledge that the software was developed by the University of California, Berkeley. The name of the University may not be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
public final int yearOfWeekNumber()
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