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Dates

Parsing

Parse a date and time from a string

Given the string "2008-05-06 13:29", parse it as a date representing 6th March, 2008 1:29:00pm in the local time zone.

java

DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm");
Date date = df.parse("2008-05-06 13:29");

DateTimeFormatter fmt = DateTimeFormat.forPattern("yyyy-MM-dd HH:mm");
DateTime dt = fmt.parseDateTime("2008-05-06 13:29");

cpp

DateTimeOffset^ dateTime = DateTimeOffset::Parse("2008-05-06 13:29");

// Use format specifiers to appropriately format string
// 1. Default culture
Console::WriteLine("{0}", dateTime->ToString("d MMMM, yyyy h:mm:sstt"));

// 2. Nominated culture
Console::WriteLine("{0}", dateTime->ToString("d MMMM, yyyy h:mm:sstt"), Globalization::CultureInfo::CreateSpecificCulture("en-us"));

DateTimeOffset^ dateTime = DateTimeOffset::Parse("2008-05-06 13:29");

// Customize date/time string
Text::StringBuilder^ dsb = gcnew Text::StringBuilder(40);
dsb->Append(dateTime->ToString("%d"))->Append("th ")->Append(dateTime->ToString("MMMM, yyyy h:mm:ss"))->Append(dateTime->ToString("tt")->ToLower());

Console::WriteLine("{0}", dsb);

Printing

Display information about a date

Display the day of month, day of year, month name and day name of the day 8 days from now.

java

Calendar cal = Calendar.getInstance();
cal.add(DAY_OF_YEAR, 8);
System.out.println(cal.get(DAY_OF_MONTH));
System.out.println(cal.get(DAY_OF_YEAR));
System.out.println(new SimpleDateFormat("MMMM").format(cal.getTime()));
System.out.println(new SimpleDateFormat("EEEE").format(cal.getTime()));

cpp

QDate dateEightDaysFromNow = QDate::currentDate().addDays(8);

Display a date in different locales

Display a language/locale friendly version of New Year's Day for 2009 for several languages/locales. E.g. for languages English, French, German, Italian, Dutch the output might be something like:

Thursday, January 1, 2009
jeudi 1 janvier 2009
giovedì 1 gennaio 2009
Donnerstag, 1. Januar 2009
donderdag 1 januari 2009

(Indicate in comments where possible if any language specific or operating system configuration needs to be in place.)

java

Calendar cal = Calendar.getInstance();
cal.set(2009, Calendar.JANUARY, 1);
Locale[] locales = { ENGLISH, FRENCH, ITALIAN, GERMAN, new Locale("nl") };

for (Locale l : locales) {
System.out.println(getDateInstance(FULL, l).format(cal.getTime()));
}

cpp

QList<QLocale::Language> locales;
locales << QLocale::English
<< QLocale::French
<< QLocale::German
<< QLocale::Italian
<< QLocale::Dutch;

QDate date(2009, 1, 1);
foreach (QLocale::Language ll, locales)
{
QLocale::setDefault(ll);
qDebug() << date.toString(Qt::DefaultLocaleLongDate);
}

Creation

Display the current date and time

Create a Date object representing the current date and time. Print it out.
If you can also do this without creating a Date object you can show that too.

java

import java.util.Date;

public class SolutionXX {
public static void main(String[] args) {
Date now = new Date();
System.out.println(now.toString());
}
}

cpp

QDate now = QDate::currentData();
qDebug() << now.toString();

time_t date = time(0);
cout << ctime(&date);