QDate Class Reference |
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. If the year is negative, a minus sign is prepended in addition. |
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
See also QDateTime::fromString(), QTime::fromString(), QDate::toString(), QDateTime::toString(), and QTime::toString().
Returns true if the specified year is a leap year; otherwise returns false.
Returns true if the date is null; otherwise returns false. A null date is invalid.
Note: The behavior of this function is identical to isValid().
See also isValid().
Returns true if this date is valid; otherwise returns false.
See also isNull().
This is an overloaded member function, provided for convenience.
Returns true if the specified date (year, month, and day) 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)
See also isNull() and setDate().
Returns the long name of the weekday using the following convention:
The day names will be localized according to the system's locale settings.
See also toString(), shortDayName(), shortMonthName(), and longMonthName().
Returns the long name of the month using the following convention:
The month names will be localized according to the system's locale settings.
See also toString(), shortMonthName(), shortDayName(), and longDayName().
Returns the number corresponding to the month of this date, using the following convention:
Sets the date's year, month, and day. 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.
This function was introduced in Qt 4.2.
See also isValid().
Returns the name of the weekday using the following convention:
The day names will be localized according to the system's locale settings.
See also toString(), shortMonthName(), longMonthName(), and longDayName().
Returns the name of the month using the following convention:
The month names will be localized according to the system's locale settings.
See also toString(), longMonthName(), shortDayName(), and longDayName().
Converts the date to a Julian day.
See also fromJulianDay().
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 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 to 12) |
MM | the month as 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. If the year is negative, a minus sign is prepended in addition. |
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 |
---|---|
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: The Qt::ISODate format is only valid for years in the range 0 to 9999. This restriction may apply to locale-aware formats as well, depending on the locale settings.
See also QDateTime::toString() and QTime::toString().
This is an overloaded member function, provided for convenience.
Returns the date as a string. The format parameter determines the format of the string.
If the format 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 format 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 format is Qt::SystemLocaleShortDate or Qt::SystemLocaleLongDate, the string format depends on the locale settings of the system. Identical to calling QLocale::system().toString(date, QLocale::ShortFormat) or QLocale::system().toString(date, QLocale::LongFormat).
If the format is Qt::DefaultLocaleShortDate or Qt::DefaultLocaleLongDate, 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) or QLocale().toString(date, QLocale::LongFormat).
If the date 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 locale-aware formats as well, depending on the locale settings.
See also shortDayName() and shortMonthName().
Returns the week number (1 to 53), and stores the year in *yearNumber unless yearNumber is null (the default).
Returns 0 if the date is invalid.
In accordance with ISO 8601, weeks start on Monday and the first Thursday of a year is always in week 1 of that year. Most years have 52 weeks, but some have 53.
*yearNumber is not always the same as year(). For example, 1 January 2000 has week number 52 in the year 1999, and 31 December 2002 has week number 1 in the year 2003.
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.
See also isValid().
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.
Returns true if this date is different from d; otherwise returns false.
Returns true if this date is earlier than d; otherwise returns false.
Returns true if this date is earlier than or equal to d; otherwise returns false.
Returns true if this date is equal to d; otherwise returns false.
Returns true if this date is later than d; otherwise returns false.
Returns true if this date is later than or equal to d; otherwise returns false.
This is an overloaded member function, provided for convenience.
Writes the date to stream out.
See also Format of the QDataStream operators.
This is an overloaded member function, provided for convenience.
Reads a date from stream in into the date.
See also Format of the QDataStream operators.
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