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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.
python
import time
time.strptime("2008-05-06 13:29", "%Y-%m-%d %H:%M")
clojure
(.. (SimpleDateFormat. "yyyy-MM-dd HH:mm")
(parse "2008-05-06 13:29"))
fsharp
let dateTime = DateTimeOffset.Parse("2008-05-06 13:29")

// Use format specifiers to appropriately format string
// 1. Default culture
printfn "%s" (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"))
let dateTime = DateTimeOffset.Parse("2008-05-06 13:29")

// Customize date/time string
let dsb = ((new StringBuilder(40)).Append(dateTime.ToString("%d")).Append("th ").Append(dateTime.ToString("MMMM, yyyy h:mm:ss")).Append(dateTime.ToString("tt").ToLower()))

printfn "%s" (dsb.ToString())
fantom
dt := DateTime.fromLocale("2008-05-06 13:29", "YYYY-MM-DD hh:mm")
csharp
DateTime parsedDate = DateTime.Parse("2008-05-06 13:29");
// Ideally, you would catch the potential FormatException or use DateTime.TryParse in production code.
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.
python
from datetime import datetime, timedelta

eightDaysFromNow = datetime.now() + timedelta(days=8)

print eightDaysFromNow.strftime('%d') # day of month
print eightDaysFromNow.strftime('%j') # day of year
print eightDaysFromNow.strftime('%B') # month name FULL
print eightDaysFromNow.strftime('%A') # day of week name FULL
clojure
(let [cal (Calendar/getInstance)]
(.add cal Calendar/DAY_OF_YEAR 8)
(println (.format (SimpleDateFormat. "d, D, MMMM, EEEE")
(.getTime cal))))
fsharp
Using F# interactive

> let Then = DateTime.Now.AddDays(8.0)
- let dayNumber = Then.DayOfYear.ToString()
- let solution = Then.ToString("dd " + dayNumber + " MMMM dddd");;

val Then : DateTime = 08/08/2010 08:58:05
val dayNumber : string = "220"
val solution : string = "08 220 August Sunday"

>
fantom
date := Date.today + 8day
echo(date.day)
echo(date.dayOfYear)
echo(date.month.localeFull)
echo(date.weekday.localeFull)
csharp
DateTime date = DateTime.Today.AddDays(8);

Console.WriteLine("Day of month: " + date.Day);
Console.WriteLine("Day of year: " + date.DayOfYear);
Console.WriteLine("Month name: " + date.ToString("MMMM"));
Console.WriteLine("Day name: " + date.ToString("dddd"));

// The two ToString calls will use the current locale.
// To get localised month and day names, see http://msdn.microsoft.com/en-us/library/8tfzyc64.aspx

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.)
python
from datetime import datetime
from locale import setlocale, LC_TIME

now = datetime(2009, 1, 1)

locales = ('en_us', 'fr_fr', 'it_it', 'de_de', 'nl_nl')
for locale in locales:
setlocale(LC_TIME, locale)
print now.strftime('%A, %B %d %Y')

clojure
(let [time (.getTime (GregorianCalendar. 2009 Calendar/JANUARY 1))]
(doseq [locale ["en" "fr" "it" "de" "nl"]]
(println (.format (DateFormat/getDateInstance DateFormat/FULL
(Locale. locale))
time))))
fsharp
open System
open System.Globalization

let jan1 = DateTime(2009, 1, 1)

[ "en-US"; "fr-FR"; "de-DE"; "it-IT"; "nl-NL" ]
|> List.map CultureInfo.CreateSpecificCulture
|> List.map (fun c -> jan1.ToString("D", c))
|> List.iter (printfn "%s")
fantom
// May require modification of Fantom distribution t
// for undefined locales - basically just create a '<locale-name>.props' plain text file with values like this:
// sunAbbr=Sun
// ..
// sunFull=Sunday
["en", "fr", "ru"].map { Locale(it) }.each |Locale l| {
l.use { echo(Date(2009, Month.jan, 1).toLocale("WWWW, MMMM D, YYYY")) }
}
csharp
using System.Globalization;

DateTime newYearsDay = new DateTime(2009, 1, 1);
CultureInfo[] locales = {
CultureInfo.CreateSpecificCulture("en-US"),
CultureInfo.CreateSpecificCulture("fr-FR"),
CultureInfo.CreateSpecificCulture("de-DE"),
CultureInfo.CreateSpecificCulture("it-IT"),
CultureInfo.CreateSpecificCulture("nl-NL")
};

foreach (CultureInfo locale in locales)
{
Console.WriteLine(newYearsDay.ToString("D", locale));
}
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.
python
from datetime import datetime
print datetime.utcnow()
clojure
(import 'java.util.Date)

(println (str (Date.)))
fsharp
printfn "%A" System.DateTime.Now
fantom
echo(DateTime.now)
csharp
// Creating a variable first:
DateTime now = DateTime.Now;
Console.WriteLine(now);

// Without creating a variable:
Console.WriteLine(DateTime.Now);