📸 How to Decode Instagram Shortcode to Date

function decodeInstagramShortcode(shortcode) {
    // Instagram's Base64 alphabet
    const alphabet = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_';
    
    // Convert shortcode to media ID
    let mediaId = 0n;
    for (let char of shortcode) {
        mediaId = mediaId * 64n + BigInt(alphabet.indexOf(char));
    }
    
    // Extract timestamp (right shift by 22 bits)
    const timestamp = Number(mediaId >> 22n);
    
    // Convert to date
    const date = new Date(timestamp * 1000);
    
    return {
        shortcode: shortcode,
        mediaId: mediaId.toString(),
        timestamp: timestamp,
        date: date.toUTCString()
    };
}

// Example usage
const result = decodeInstagramShortcode('CwkxyiVP2MU');
console.log(result);
// Output: { shortcode: 'CwkxyiVP2MU', mediaId: '3165871364981502292', 
//           timestamp: 1690123456, date: 'Sun Jul 23 2023 12:34:16 GMT' }

from datetime import datetime

def decode_instagram_shortcode(shortcode):
    """Decode Instagram shortcode to date"""
    # Instagram's Base64 alphabet
    alphabet = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_'
    
    # Convert shortcode to media ID
    media_id = 0
    for char in shortcode:
        media_id = media_id * 64 + alphabet.index(char)
    
    # Extract timestamp (right shift by 22 bits)
    timestamp = media_id >> 22
    
    # Convert to date
    date = datetime.fromtimestamp(timestamp)
    
    return {
        'shortcode': shortcode,
        'media_id': media_id,
        'timestamp': timestamp,
        'date': date.strftime('%Y-%m-%d %H:%M:%S UTC')
    }

# Example usage
result = decode_instagram_shortcode('CwkxyiVP2MU')
print(result)
# Output: {'shortcode': 'CwkxyiVP2MU', 'media_id': 3165871364981502292,
#          'timestamp': 1690123456, 'date': '2023-07-23 12:34:16 UTC'}