from datetime import datetime
# Aktuelles Datum und Uhrzeit
now = datetime.now()

# Verschiedene Formate
print(now.strftime("%m/%d/%Y")) # 09/17/2025
print(now.isoformat())

# Kalenderwoche (ISO)
week_number = now.isocalendar().week
print(f"Week number: {week_number}")

import java.time.*;
import java.time.format.DateTimeFormatter;
import java.time.temporal.WeekFields;

// Aktuelles Datum und Uhrzeit
LocalDateTime now = LocalDateTime.now();

// Formatierung
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("MM/dd/yyyy");
System.out.println(now.format(formatter));

// Kalenderwoche (ISO)  
int weekOfYear = now.get(WeekFields.ISO.weekOfWeekBasedYear());
System.out.println("Week number: " + weekOfYear);

using System;
using System.Globalization;

// Aktuelles Datum und Uhrzeit
DateTime now = DateTime.Now;

// Verschiedene Formate
Console.WriteLine(now.ToString("MM/dd/yyyy")); // 09/17/2025
Console.WriteLine(now.ToString("o")); // ISO 8601

// Kalenderwoche (ISO 8601)
int weekOfYear = ISOWeek.GetWeekOfYear(now);
Console.WriteLine($"Week number: {weekOfYear}");

<?php
// Aktuelles Datum und Uhrzeit
$now = new DateTime();

// Verschiedene Formate
echo $now->format('m/d/Y'); // 09/17/2025
echo $now->format('c'); // ISO 8601

// Kalenderwoche (ISO 8601)
echo $now->format('W');
?>

require 'date'
# Aktuelles Datum und Uhrzeit
now = Time.now

# Verschiedene Formate
puts now.strftime("%m/%d/%Y") # 09/17/2025
puts now.iso8601

# Kalenderwoche (ISO 8601)
puts now.strftime("%V")

package main
import ("fmt"; "time")

func main() {
    now := time.Now()
    
    // Verschiedene Formate
    fmt.Println(now.Format("01/02/2006")) // 09/17/2025
    
    // Kalenderwoche (ISO 8601)
    _, week := now.ISOWeek()
    fmt.Printf("Week number: %d\n", week)
}

import Foundation

let now = Date()
let formatter = DateFormatter()

// Format festlegen
formatter.dateFormat = "MM/dd/yyyy"
print(formatter.string(from: now)) // 09/17/2025

// ISO 8601 Format
let isoFormatter = ISO8601DateFormatter()
print(isoFormatter.string(from: now))

// Kalenderwoche
let calendar = Calendar.current
let weekOfYear = calendar.component(.weekOfYear, from: now)
print("Week: \(weekOfYear)")

import java.time.LocalDateTime
import java.time.format.DateTimeFormatter
import java.time.temporal.WeekFields
import java.util.Locale

fun main() {
    val now = LocalDateTime.now()

    // Formatierung
    val formatter = DateTimeFormatter.ofPattern("MM/dd/yyyy")
    println(now.format(formatter))

    // Kalenderwoche
    val weekFields = WeekFields.of(Locale.getDefault())
    val weekNumber = now.get(weekFields.weekOfWeekBasedYear())
    println("Week: $weekNumber")
}

# Aktuelles Datum abrufen
today <- Sys.Date()

# Datum formatieren
formatted_date <- format(today, "%m/%d/%Y")
print(formatted_date)

# Aktuelles Datum und Uhrzeit abrufen
now <- Sys.time()
print(now)

# Kalenderwoche (ISO 8601)
week_num <- format(today, "%V")
print(paste("Week:", week_num))

-- MySQL / MariaDB
SELECT DATE_FORMAT(NOW(), '%m/%d/%Y');
SELECT WEEK(NOW(), 3); -- ISO Kalenderwoche

-- PostgreSQL
SELECT TO_CHAR(NOW(), 'MM/DD/YYYY');
SELECT EXTRACT(WEEK FROM NOW());

-- SQL Server
SELECT FORMAT(GETDATE(), 'MM/dd/yyyy');
SELECT DATEPART(ISOWK, GETDATE());