QDate

The QDate class provides date functions. More

Inheritance diagram of PySide6.QtCore.QDate

Synopsis

Functions

Static functions

Detailed Description

A QDate object represents a particular day, regardless of calendar, locale or other settings used when creating it or supplied by the system. It can report the year, month and day of the month that represent the day with respect to the proleptic Gregorian calendar or any calendar supplied as a QCalendar object. QDate objects should be passed by value rather than by reference to const; they simply package qint64.

A QDate object is typically created by giving the year, month, and day numbers explicitly. Note that QDate interprets year numbers less than 100 as presented, i.e., as years 1 through 99, without adding any offset. The static function currentDate() creates a QDate object containing the date read from the system clock. 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. When more than one of these values is needed, it is more efficient to call partsFromDate() , to save repeating (potentially expensive) calendrical calculations.

Also, dayOfWeek() and dayOfYear() functions are provided. The same information is provided in textual format by toString() . QLocale can map the day numbers to names, QCalendar can map month numbers to names.

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 a date is in a leap year. QCalendar can also supply this information, in some cases more conveniently.

Remarks

Note

All conversion to and from string formats is done using the C locale. For localized conversions, see QLocale .

In the Gregorian calendar, there is no year 0. Dates in that year are considered invalid. The year -1 is the year “1 before Christ” or “1 before common era.” The day before 1 January 1 CE, QDate (1, 1, 1), is 31 December 1 BCE, QDate (-1, 12, 31). Various other calendars behave similarly; see hasYearZero() .

Range of Valid Dates

Dates are stored internally as a Julian Day number, an integer count of every day in a contiguous range, with 24 November 4714 BCE in the Gregorian calendar being Julian Day 0 (1 January 4713 BCE in the Julian calendar). As well as being an efficient and accurate way of storing an absolute date, it is suitable for converting a date into other calendar systems such as Hebrew, Islamic or Chinese. The Julian Day number can be obtained using toJulianDay() and can be set using fromJulianDay() .

The range of Julian Day numbers that QDate can represent is, for technical reasons, limited to between -784350574879 and 784354017364, which means from before 2 billion BCE to after 2 billion CE. This is more than seven times as wide as the range of dates a QDateTime can represent.

See also

QTime QDateTime QCalendar YearRange QDateEdit QDateTimeEdit QCalendarWidget

class PySide6.QtCore.QDate

PySide6.QtCore.QDate(QDate)

PySide6.QtCore.QDate(y, m, d)

PySide6.QtCore.QDate(y, m, d, cal)

Parameters

Constructs a null date. Null dates are invalid.

See also

isNull() isValid()

Constructs a date with year y, month m and day d.

The date is understood in terms of the Gregorian calendar. If the specified date is invalid, the date is not set and isValid() returns false.

Warning

Years 1 to 99 are interpreted as is. Year 0 is invalid.

PySide6.QtCore.QDate.__reduce__()
Return type

object

PySide6.QtCore.QDate.__repr__()
Return type

object

PySide6.QtCore.QDate.addDays(days)
Parameters

days – int

Return type

PySide6.QtCore.QDate

Returns a QDate object containing a date ndays later than the date of this object (or earlier if ndays is negative).

Returns a null date if the current date is invalid or the new date is out of range.

PySide6.QtCore.QDate.addMonths(months)
Parameters

months – int

Return type

PySide6.QtCore.QDate

This is an overloaded function.

PySide6.QtCore.QDate.addMonths(months, cal)
Parameters
Return type

PySide6.QtCore.QDate

Returns a QDate object containing a date nmonths later than the date of this object (or earlier if nmonths is negative).

Uses cal as calendar, if supplied, else the Gregorian calendar.

Note

If the ending day/month combination does not exist in the resulting month/year, this function will return a date that is the latest valid date in the selected month.

PySide6.QtCore.QDate.addYears(years)
Parameters

years – int

Return type

PySide6.QtCore.QDate

This is an overloaded function.

PySide6.QtCore.QDate.addYears(years, cal)
Parameters
Return type

PySide6.QtCore.QDate

Returns a QDate object containing a date nyears later than the date of this object (or earlier if nyears is negative).

Uses cal as calendar, if supplied, else the Gregorian calendar.

Note

If the ending day/month combination does not exist in the resulting year (e.g., for the Gregorian calendar, if the date was Feb 29 and the final year is not a leap year), this function will return a date that is the latest valid date in the given month (in the example, Feb 28).

static PySide6.QtCore.QDate.currentDate()
Return type

PySide6.QtCore.QDate

Returns the current date, as reported by the system clock.

PySide6.QtCore.QDate.day()
Return type

int

This is an overloaded function.

PySide6.QtCore.QDate.day(cal)
Parameters

calPySide6.QtCore.QCalendar

Return type

int

Returns the day of the month for this date.

Uses cal as calendar if supplied, else the Gregorian calendar (for which the return ranges from 1 to 31). Returns 0 if the date is invalid.

PySide6.QtCore.QDate.dayOfWeek(cal)
Parameters

calPySide6.QtCore.QCalendar

Return type

int

Returns the weekday (1 = Monday to 7 = Sunday) for this date.

Uses cal as calendar if supplied, else the Gregorian calendar. Returns 0 if the date is invalid. Some calendars may give special meaning (e.g. intercallary days) to values greater than 7.

See also

day() dayOfYear() dayOfWeek() DayOfWeek

PySide6.QtCore.QDate.dayOfWeek()
Return type

int

This is an overloaded function.

PySide6.QtCore.QDate.dayOfYear()
Return type

int

This is an overloaded function.

PySide6.QtCore.QDate.dayOfYear(cal)
Parameters

calPySide6.QtCore.QCalendar

Return type

int

Returns the day of the year (1 for the first day) for this date.

Uses cal as calendar if supplied, else the Gregorian calendar. Returns 0 if either the date or the first day of its year is invalid.

PySide6.QtCore.QDate.daysInMonth()
Return type

int

This is an overloaded function.

PySide6.QtCore.QDate.daysInMonth(cal)
Parameters

calPySide6.QtCore.QCalendar

Return type

int

Returns the number of days in the month for this date.

Uses cal as calendar if supplied, else the Gregorian calendar (for which the result ranges from 28 to 31). Returns 0 if the date is invalid.

PySide6.QtCore.QDate.daysInYear()
Return type

int

This is an overloaded function.

PySide6.QtCore.QDate.daysInYear(cal)
Parameters

calPySide6.QtCore.QCalendar

Return type

int

Returns the number of days in the year for this date.

Uses cal as calendar if supplied, else the Gregorian calendar (for which the result is 365 or 366). Returns 0 if the date is invalid.

PySide6.QtCore.QDate.daysTo(d)
Parameters

dPySide6.QtCore.QDate

Return type

int

Returns the number of days from this date to d (which is negative if d is earlier than this date).

Returns 0 if either date is invalid.

Example:

d1 = QDate(1995, 5, 17)
d2 = QDate(1995, 5, 20)
d1.daysTo(d2) # returns 3
d2.daysTo(d1) # returns -3

See also

addDays()

PySide6.QtCore.QDate.endOfDay([spec=Qt.LocalTime[, offsetSeconds=0]])
Parameters
  • specTimeSpec

  • offsetSeconds – int

Return type

PySide6.QtCore.QDateTime

PySide6.QtCore.QDate.endOfDay(zone)
Parameters

zonePySide6.QtCore.QTimeZone

Return type

PySide6.QtCore.QDateTime

This is an overloaded function.

static PySide6.QtCore.QDate.fromJulianDay(jd_)
Parameters

jd – int

Return type

PySide6.QtCore.QDate

Converts the Julian day jd to a QDate .

See also

toJulianDay()

static PySide6.QtCore.QDate.fromString(string, format[, cal=QCalendar()])
Parameters
Return type

PySide6.QtCore.QDate

static PySide6.QtCore.QDate.fromString(string[, format=Qt.TextDate])
Parameters
Return type

PySide6.QtCore.QDate

static PySide6.QtCore.QDate.fromString(string[, format=Qt.TextDate])
Parameters
Return type

PySide6.QtCore.QDate

This is an overloaded function.

static PySide6.QtCore.QDate.fromString(string, format[, cal=QCalendar()])
Parameters
Return type

PySide6.QtCore.QDate

This is an overloaded function.

static PySide6.QtCore.QDate.fromString(string, format[, cal=QCalendar()])
Parameters
Return type

PySide6.QtCore.QDate

PySide6.QtCore.QDate.getDate()

Extracts the date’s year, month, and day, and assigns them to *``year``, *``month``, and *``day``. The pointers may be null.

Returns 0 if the date is invalid.

Note

In Qt versions prior to 5.7, this function is marked as non-const.

static PySide6.QtCore.QDate.isLeapYear(year)
Parameters

year – int

Return type

bool

Returns true if the specified year is a leap year in the Gregorian calendar; otherwise returns false.

See also

isLeapYear()

PySide6.QtCore.QDate.isNull()
Return type

bool

Returns true if the date is null; otherwise returns false. A null date is invalid.

Note

The behavior of this function is equivalent to isValid() .

See also

isValid()

PySide6.QtCore.QDate.isValid()
Return type

bool

Returns true if this date is valid; otherwise returns false.

static PySide6.QtCore.QDate.isValid(y, m, d)
Parameters
  • y – int

  • m – int

  • d – int

Return type

bool

This is an overloaded function.

Returns true if the specified date (year, month, and day) is valid in the Gregorian calendar; 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)
PySide6.QtCore.QDate.month()
Return type

int

This is an overloaded function.

PySide6.QtCore.QDate.month(cal)
Parameters

calPySide6.QtCore.QCalendar

Return type

int

Returns the month-number for the date.

Numbers the months of the year starting with 1 for the first. Uses cal as calendar if supplied, else the Gregorian calendar, for which the month numbering is as follows:

  • 1 = “January”

  • 2 = “February”

  • 3 = “March”

  • 4 = “April”

  • 5 = “May”

  • 6 = “June”

  • 7 = “July”

  • 8 = “August”

  • 9 = “September”

  • 10 = “October”

  • 11 = “November”

  • 12 = “December”

Returns 0 if the date is invalid. Note that some calendars may have more than 12 months in some years.

PySide6.QtCore.QDate.__ne__(rhs)
Parameters

rhsPySide6.QtCore.QDate

Return type

bool

PySide6.QtCore.QDate.__lt__(rhs)
Parameters

rhsPySide6.QtCore.QDate

Return type

bool

PySide6.QtCore.QDate.__le__(rhs)
Parameters

rhsPySide6.QtCore.QDate

Return type

bool

PySide6.QtCore.QDate.__eq__(rhs)
Parameters

rhsPySide6.QtCore.QDate

Return type

bool

PySide6.QtCore.QDate.__gt__(rhs)
Parameters

rhsPySide6.QtCore.QDate

Return type

bool

PySide6.QtCore.QDate.__ge__(rhs)
Parameters

rhsPySide6.QtCore.QDate

Return type

bool

PySide6.QtCore.QDate.setDate(year, month, day)
Parameters
  • year – int

  • month – int

  • day – int

Return type

bool

Sets this to represent the date, in the Gregorian calendar, with the given year, month and day numbers. Returns true if the resulting date is valid, otherwise it sets this to represent an invalid date and returns false.

PySide6.QtCore.QDate.setDate(year, month, day, cal)
Parameters
Return type

bool

Sets this to represent the date, in the given calendar cal, with the given year, month and day numbers. Returns true if the resulting date is valid, otherwise it sets this to represent an invalid date and returns false.

PySide6.QtCore.QDate.startOfDay([spec=Qt.LocalTime[, offsetSeconds=0]])
Parameters
  • specTimeSpec

  • offsetSeconds – int

Return type

PySide6.QtCore.QDateTime

PySide6.QtCore.QDate.startOfDay(zone)
Parameters

zonePySide6.QtCore.QTimeZone

Return type

PySide6.QtCore.QDateTime

This is an overloaded function.

PySide6.QtCore.QDate.toJulianDay()
Return type

int

Converts the date to a Julian day.

See also

fromJulianDay()

PySide6.QtCore.QDate.toPython()
Return type

object

PySide6.QtCore.QDate.toString(format[, cal=QCalendar()])
Parameters
Return type

str

PySide6.QtCore.QDate.toString([format=Qt.TextDate])
Parameters

formatDateFormat

Return type

str

This is an overloaded function.

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

If the format is TextDate , the string is formatted in the default way. The day and month names will be in English. An example of this formatting is “Sat May 20 1995”. For localized formatting, see toString() .

If the format is 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 RFC2822Date , the string is formatted in an RFC 2822 compatible way. An example of this formatting is “20 May 1995”.

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

Warning

The ISODate format is only valid for years in the range 0 to 9999.

PySide6.QtCore.QDate.toString(format[, cal=QCalendar()])
Parameters
Return type

str

PySide6.QtCore.QDate.weekNumber()
Return type

(week, yearNumber)

Returns the ISO 8601 week number (1 to 53).

Returns 0 if the date is invalid. Otherwise, returns the week number for the date. If yearNumber is not None (its default), stores the year as *``yearNumber``.

In accordance with ISO 8601, each week falls in the year to which most of its days belong, in the Gregorian calendar. As ISO 8601’s week starts on Monday, this is the year in which the week’s Thursday falls. Most years have 52 weeks, but some have 53.

Note

*``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.

See also

isValid()

PySide6.QtCore.QDate.year()
Return type

int

This is an overloaded function.

PySide6.QtCore.QDate.year(cal)
Parameters

calPySide6.QtCore.QCalendar

Return type

int

Returns the year of this date.

Uses cal as calendar, if supplied, else the Gregorian calendar.

Returns 0 if the date is invalid. For some calendars, dates before their first year may all be invalid.

If using a calendar which has a year 0, check using isValid() if the return is 0. Such calendars use negative year numbers in the obvious way, with year 1 preceded by year 0, in turn preceded by year -1 and so on.

Some calendars, despite having no year 0, have a conventional numbering of the years before their first year, counting backwards from 1. For example, in the proleptic Gregorian calendar, successive years before 1 CE (the first year) are identified as 1 BCE, 2 BCE, 3 BCE and so on. For such calendars, negative year numbers are used to indicate these years before year 1, with -1 indicating the year before 1.