Date setdate update#
Date setdate full#

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. Range of Valid Datesĭates 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). Various other calendars behave similarly see QCalendar::hasYearZero(). 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).

Dates in that year are considered invalid. In the Gregorian calendar, there is no year 0. QCalendar can also supply this information, in some cases more conveniently. The isLeapYear() function indicates whether a date is in a leap year. The daysInMonth() and daysInYear() functions return how many days there are in this date's month and year, respectively. The daysTo() function returns the number of days between two dates. Similarly you can use addMonths() and addYears(). You can increment (or decrement) a date by a given number of days using addDays().

Date setdate full#

QDate provides a full set of operators to compare two QDate objects where smaller means earlier, and larger means later. QLocale can map the day numbers to names, QCalendar can map month numbers to names. The same information is provided in textual format by toString(). When more than one of these values is needed, it is more efficient to call QCalendar::partsFromDate(), to save repeating (potentially expensive) calendrical calculations.Īlso, dayOfWeek() and dayOfYear() functions are provided. The year(), month(), and day() functions provide access to the year, month, and day numbers. The fromString() function returns a QDate given a string and a date format which is used to interpret the date within the string. An explicit date can also be set using setDate(). The static function currentDate() creates a QDate object containing the date read from the system clock. Note that QDate interprets year numbers less than 100 as presented, i.e., as years 1 through 99, without adding any offset. 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.Ī QDate object is typically created by giving the year, month, and day numbers explicitly.

WeekNumber(int * yearNumber = nullptr) constĪ QDate object represents a particular day, regardless of calendar, locale or other settings used when creating it or supplied by the system. ToString(QStringView format, QCalendar cal) const ToString(const QString & format, QCalendar cal) const ToString(Qt::DateFormat format = Qt::TextDate) const StartOfDay(Qt::TimeSpec spec = Qt::LocalTime, int offsetSeconds = 0) const

SetDate(int year, int month, int day, QCalendar cal) GetDate(int * year, int * month, int * day) const tDate(-50) // (11th of August 1962) Specifications SpecificationĮCMAScript (ECMA-262) The definition of '' in that specification.AddMonths(int nmonths, QCalendar cal) constĪddYears(int nyears, QCalendar cal) constĮndOfDay(Qt::TimeSpec spec = Qt::LocalTime, int offsetSeconds = 0) const 1 would result in the date being set to 1 day before the last day of the previous month.Įxamples Using setDate() var theBigDay = new Date(1962, 6, 7) // (7th of July 1962)

If a negative number is provided for dayValue, the date will be set counting backwards from the last day of the previous month.

Date setdate update#

If the dayValue is outside of the range of date values for the month, setDate() will update the Date object accordingly.įor example, if 0 is provided for dayValue, the date will be set to the last day of the previous month. The number of milliseconds between 1 January 1970 00:00:00 UTC and the given date (the Date object is also changed in place). Syntax tDate(dayValue) Parameters dayValue An integer representing the day of the month.