Date & time in Qt. In this part of the Qt. C++ programming tutorial, we will talk about. Qt. 4 has QDate, QTime, and QDate. Time. classes to work with date and time. The QDate is a class for working with a calendar date in the Gregorian. It has methods for determining the date, comparing, or manipulating dates.
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The QTime class works with a clock time. It provides methods for comparing.
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- Date and time in Qt4. In this part of the Qt4 C++ programming tutorial, we will talk about time and date.
The QDate. Time is a class that combines both QDate and QTime. Initialising date & time objects. Date and time objects can be initialised in two basic ways. We initialise. them in the object constructor or we can create empty objects and. QText. Stream>.
QDate>. #include < QTime>. QText. Stream out(stdout). QDate dt. 1(2. 01. The date is " < < dt. String() < < endl. Date(2. 01. 5, 3, 3).
The date is " < < dt. String() < < endl.
QTime tm. 1(1. 7, 3. The time is " < < tm. String("hh: mm: ss.
HMS(1. 3, 5. 2, 4. The time is " < < tm. String("hh: mm: ss. We initialise date and time object in both ways.
QDate dt. 1(2. 01. The QDate object constructor takes three parameters: the. The date is " < < dt.
String() < < endl. The date is printed to the console. We use the to. String(). HMS(1. 3, 5. 2, 4. An empty QTime object is created. We fill the object with data.
HMS() method. The parameters are the hours, minutes. The time is " < < tm. String("hh: mm: ss.
We print the QTime object to the console. We use a specific format that. The date is Sun Apr 1. The date is Tue Mar 3 2. The time is 1. 7: 3. The time is 1. 3: 5. Current date & time.
In the following example, we print the current local time and. QText. Stream>. QTime>. #include < QDate>.
QText. Stream out(stdout). QDate cd = QDate: :current. Date(). QTime ct = QTime: :current. Time(). out < < "Current date is: " < < cd. String() < < endl. Current time is: " < < ct. String() < < endl.
Watch out that the file must not be called time. QDate cd = QDate: :current. Date(). The QDate: :current. Date() static function returns the current date. QTime ct = QTime: :current. Time(). The QTime: :current.
Time() static function returns the current time. Current date is: " < < cd. String() < < endl. Current time is: " < < ct. String() < < endl.
We use the to. String() method to convert the date and time. Current date is: Wed Oct 1. Current time is: 1. Comparing dates. Relational operators can be used to compare dates. We can compare their position in the calendar. QText. Stream>. QDate>. int main(void) {.
QText. Stream out(stdout). QDate dt. 1(2. 01. QDate dt. 2(2. 01.
String() < < " comes before ". String() < < endl. String() < < " comes after ". String() < < endl. The example compares two dates. QDate dt. 1(2. 01.
QDate dt. 2(2. 01. We have two different dates. String() < < " comes before ".
String() < < endl. String() < < " comes after ". String() < < endl. We compare the dates with a lower than (< ) comparison operator and. Sun Apr 5 2. 01. 5 comes after Sat Apr 5 2. Comparison operators can be easily used for QTime and QDate.
Time. Determining a leap year. A leap year is a year containing an additional day. The reason for an extra day. The calendar year has exactly 3.
Sun, is 3. 65. 2. The difference is 6 hours which means that in four years time we are missing one day. Because we want to have our calendar synchronised with the seasons, we add one. February each four years. There are exceptions.) In the Gregorian calendar. February in a leap year has 2. And the year lasts 3.
The QDate: :is. Leap. Year(). static method determines whether a year is a leap year. QText. Stream>. QDate>. QText. Stream out(stdout). QList< int> years({2. QDate: :is. Leap.
Year(year)) {. out < < year < < " is a leap year" < < endl. In the example we have a list of years. We check each year if it is a leap year.
QList< int> years({2. We initialise an list of years.
This is C++1. 1 construct, therefore, we need. C++1. 1. We need to add the CONFIG += c++1. QMAKE_CXXFLAGS += - std=c++1. QMAKE_CXXFLAGS += - std=c++0x to the . QDate: :is. Leap.
Year(year)) {. out < < year < < " is a leap year" < < endl. We go through the list and determine if the given year is a leap year. The QDate: :is. Leap.
Year() returns a boolean true or false. Predefined date formats. Qt. 4 has some built- in date formats. The to. String() method of a QDate.
The default. date format used by Qt. Qt: :Text. Date. dateformats. QText. Stream>. QDate>. int main(void) {. QText. Stream out(stdout). QDate cd = QDate: :current. Date(). out < < "Today is " < < cd.
String(Qt: :Text. Date) < < endl. Today is " < < cd. String(Qt: :ISODate) < < endl. Today is " < < cd. String(Qt: :System.
Locale. Short. Date) < < endl. Today is " < < cd. String(Qt: :System. Locale. Long. Date) < < endl. Today is " < < cd. String(Qt: :Default. Locale. Short. Date) < < endl.
Today is " < < cd. String(Qt: :Default. Locale. Long. Date) < < endl.
Today is " < < cd. String(Qt: :System. Locale. Date) < < endl.
Today is " < < cd. String(Qt: :Locale. Date) < < endl. In the example, we show eight different date formats for the current date. Today is " < < cd.
String(Qt: :ISODate) < < endl. Here we print the current date in the Qt: :ISODate format, which is an international. Today is Wed Oct 1. Today is 2. 01. 5- 1. Today is 1. 0/1. 4/1. Today is Wednesday, October 1. Today is 1. 0/1. 4/1.
Today is Wednesday, October 1. Today is 1. 0/1. 4/1. Today is 1. 0/1. 4/1. Custom date formats.
A date can be represented in a variety of other formats. In Qt. 4 we can create our custom date formats, too.
Another version. of the to. String() method takes a format string where. For example the d specifier. The dd specifier. The following table. Expression. Outputd.
The day as a number without a leading zero (1 to 3. The day as a number with a leading zero (0. The abbreviated localized day name (e.
Mon' to 'Sun'). Uses QDate: :short. Day. Name(). dddd. The long localized day name (e.
Monday' to 'Sunday'). Uses QDate: :long.
Day. Name(). MThe month as a number without a leading zero (1 to 1. MMThe month as a number with a leading zero (0. MMMThe abbreviated localized month name (e.
Jan' to 'Dec'). Uses QDate: :short. Month. Name(). MMMMThe long localized month name (e. January' to 'December'). Uses QDate: :long. Month. Name(). yy.
The year as two digit number (0. The year as four digit number.
If the year is negative, a minus sign is prepended in addition. Table: Date format specifierscustomdateformats. QText. Stream>.
QDate>. int main(void) {. QText. Stream out(stdout). QDate cd = QDate: :current. Date(). out < < "Today is " < < cd. String("yyyy- MM- dd") < < endl. Today is " < < cd. String("yy/M/dd") < < endl.
Today is " < < cd. String("d. M. yyyy") < < endl.
Today is " < < cd. String("d- MMMM- yyyy") < < endl. We have four custom date formats. Today is " < < cd. String("yyyy- MM- dd") < < endl.
This is the international date format. The parts of the date are separated by.
The yyyy is a year having four digits. The MM. is the month as a number with a leading zero (0.
And the dd is. the day as a number with a leading zero (0. Today is " < < cd. String("yy/M/dd") < < endl.
This is another common date format. The parts are separated by a slash (/) character. The M specifier stands for a month as a number without a leading zero (1 to 1. Today is " < < cd. String("d. M. yyyy") < < endl.
This date format is used in Slovakia. The parts are separated by a dot character. The day and month are without leading zeros. First is the day, then comes the month.
Today is 2. 01. 5- 1. Today is 1. 5/1. 0/1. Today is 1. 4. 1. Today is 1. 4- October- 2.
Predefined time formats. Time has some predefined formats. The standard format. The default time format used by Qt.
Qt: :Text. Date. timeformats. QText. Stream>.
QTime>. int main(void) {. QText. Stream out(stdout). QTime ct = QTime: :current.
Time(). out < < "The time is " < < ct. String(Qt: :Text. Date) < < endl. The time is " < < ct.
String(Qt: :ISODate) < < endl. The time is " < < ct. String(Qt: :System. Locale. Short. Date) < < endl. The time is " < < ct.
String(Qt: :System. Locale. Long. Date) < < endl. The time is " < < ct. String(Qt: :Default.
Locale. Short. Date) < < endl. The time is " < < ct.
String(Qt: :Default. Locale. Long. Date) < < endl. The time is " < < ct. String(Qt: :System. Locale. Date) < < endl. The time is " < < ct. String(Qt: :Locale.
Date) < < endl. In the example, we show eight different time formats for the current time. The time is " < < ct. String(Qt: :ISODate) < < endl.
Here we print the current time in the Qt: :ISODate format, which is. The time is 1. 6: 1. The time is 1. 6: 1. The time is 4: 1. PM. The time is 4: 1. PM CEST. The time is 4: 1. PM. The time is 4: 1.
PM CEST. The time is 4: 1. PM. The time is 4: 1. PM. Custom time formats.
We can create additional time formats. We build a custom time. The following. table gives a list of available format expressions. Expression. Outpuththe hour without a leading zero (0 to 2. AM/PM display)hhthe hour with a leading zero (0. AM/PM display)Hthe hour without a leading zero (0 to 2.
AM/PM display)HHthe hour with a leading zero (0. AM/PM display)mthe minute without a leading zero (0 to 5.
AP or Ause AM/PM display. AP will be replaced by either "AM" or "PM". CEST")Table: Time format specifierscustomtimeformats.
QText. Stream>. QTime>. int main(void) {. QText. Stream out(stdout). QTime ct = QTime: :current. Time(). out < < "The time is " < < ct. String("hh: mm: ss.
The time is " < < ct. String("h: m: s a") < < endl.
The time is " < < ct. String("H: m: s A") < < endl. The time is " < < ct. String("h: m AP") < < endl. The version of Qt. Version() < < endl.