Вот несколько методов работы с форматами дат в различных языках программирования. Я приведу примеры кода для каждого метода:

1. JavaScript:

   // Get current date in ISO 8601 format
   const currentDate = new Date().toISOString();
   console.log(currentDate);
   // Format a date using a library like moment.js
   const formattedDate = moment(currentDate).format('YYYY-MM-DD');
   console.log(formattedDate);

2. Python:

   from datetime import datetime
   # Get current date in ISO 8601 format
   current_date = datetime.now().isoformat()
   print(current_date)
   # Format a date using strftime
   formatted_date = datetime.now().strftime('%Y-%m-%d')
   print(formatted_date)

3. Java:

   import java.time.LocalDateTime;
   import java.time.format.DateTimeFormatter;
   // Get current date in ISO 8601 format
   LocalDateTime currentDateTime = LocalDateTime.now();
   String currentDate = currentDateTime.toString();
   System.out.println(currentDate);
   // Format a date using DateTimeFormatter
   DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd");
   String formattedDate = currentDateTime.format(formatter);
   System.out.println(formattedDate);

4. PHP:

   // Get current date in ISO 8601 format
   $currentDate = date('c');
   echo $currentDate;
   // Format a date using date and strtotime functions
   $formattedDate = date('Y-m-d', strtotime($currentDate));
   echo $formattedDate;

5. Рубин:

   require 'date'
   # Get current date in ISO 8601 format
   currentDate = DateTime.now.iso8601
   puts currentDate
   # Format a date using strftime
   formattedDate = DateTime.now.strftime('%Y-%m-%d')
   puts formattedDate