from datetime import datetime

now = datetime.now()

# Different formatting styles
print(f"ISO format: {now.strftime('%Y-%m-%d %H:%M:%S')}")
print(f"US format: {now.strftime('%m/%d/%Y %I:%M %p')}")
print(f"Readable: {now.strftime('%B %d, %Y at %I:%M %p')}")
print(f"Short: {now.strftime('%b %d, %y')}")

from datetime import datetime

now = datetime.now()

# Year formats
print(f"4-digit year: {now.strftime('%Y')}")
print(f"2-digit year: {now.strftime('%y')}")

# Month formats
print(f"Month number: {now.strftime('%m')}")
print(f"Full month: {now.strftime('%B')}")
print(f"Short month: {now.strftime('%b')}")

# Day formats
print(f"Day of month: {now.strftime('%d')}")
print(f"Full weekday: {now.strftime('%A')}")
print(f"Short weekday: {now.strftime('%a')}")

from datetime import datetime

now = datetime.now()

# 24-hour format
print(f"24-hour time: {now.strftime('%H:%M:%S')}")
print(f"Hour (24): {now.strftime('%H')}")

# 12-hour format
print(f"12-hour time: {now.strftime('%I:%M:%S %p')}")
print(f"Hour (12): {now.strftime('%I')}")
print(f"AM/PM: {now.strftime('%p')}")

# Minutes and seconds
print(f"Minutes: {now.strftime('%M')}")
print(f"Seconds: {now.strftime('%S')}")

from datetime import datetime

now = datetime.now()

# Professional formats
print(f"Log format: {now.strftime('%Y-%m-%d %H:%M:%S')}")
print(f"Email format: {now.strftime('%a, %d %b %Y %H:%M:%S')}")
print(f"Human readable: {now.strftime('%A, %B %d, %Y at %I:%M %p')}")

# Compact formats
print(f"Compact: {now.strftime('%Y%m%d_%H%M%S')}")
print(f"File safe: {now.strftime('%Y-%m-%d_%H-%M-%S')}")

import locale
from datetime import datetime

now = datetime.now()

# Try different locales (availability depends on system)
locales_to_try = ['en_US', 'C']

for loc in locales_to_try:
    try:
        locale.setlocale(locale.LC_TIME, loc)
        print(f"Locale {loc}:")
        print(f"  Full date: {now.strftime('%A, %B %d, %Y')}")
        print(f"  Short date: {now.strftime('%a, %b %d')}")
        break
    except locale.Error:
        continue

from datetime import datetime

def format_date_friendly(dt):
    """Format date in a friendly, readable way"""
    return dt.strftime('%B %d, %Y')

def format_time_friendly(dt):
    """Format time in a friendly way"""
    return dt.strftime('%I:%M %p').lstrip('0')

def format_datetime_log(dt):
    """Format for logging purposes"""
    return dt.strftime('%Y-%m-%d %H:%M:%S.%f')[:-3]  # milliseconds

def format_filename_safe(dt):
    """Format safe for filenames"""
    return dt.strftime('%Y%m%d_%H%M%S')

# Example usage
now = datetime.now()
print(f"Friendly date: {format_date_friendly(now)}")
print(f"Friendly time: {format_time_friendly(now)}")
print(f"Log format: {format_datetime_log(now)}")
print(f"Filename: {format_filename_safe(now)}")

from datetime import datetime, timedelta

def format_relative_time(dt):
    """Format time relative to now"""
    now = datetime.now()
    diff = now - dt
    
    if diff.days > 0:
        return f"{diff.days} days ago"
    elif diff.seconds > 3600:
        hours = diff.seconds // 3600
        return f"{hours} hours ago"
    elif diff.seconds > 60:
        minutes = diff.seconds // 60
        return f"{minutes} minutes ago"
    else:
        return "just now"

# Example usage
recent = datetime.now() - timedelta(minutes=30)
yesterday = datetime.now() - timedelta(days=1)

print(f"Recent: {format_relative_time(recent)}")
print(f"Yesterday: {format_relative_time(yesterday)}")

from datetime import datetime

def create_report_header(title):
    """Create formatted report header"""
    now = datetime.now()
    formatted_date = now.strftime('%B %d, %Y')
    formatted_time = now.strftime('%I:%M %p')
    
    header = f"""
{'='*50}
{title.upper()}
Generated on: {formatted_date} at {formatted_time}
{'='*50}
"""
    return header

def format_event_log(events):
    """Format list of events with timestamps"""
    formatted_events = []
    for event in events:
        timestamp = event['time'].strftime('%H:%M:%S')
        formatted_events.append(f"[{timestamp}] {event['message']}")
    return '\n'.join(formatted_events)

# Example usage
print(create_report_header("Daily Sales Report"))

events = [
    {'time': datetime(2024, 3, 15, 9, 30), 'message': 'System startup'},
    {'time': datetime(2024, 3, 15, 10, 15), 'message': 'User login'},
    {'time': datetime(2024, 3, 15, 11, 0), 'message': 'Data backup completed'}
]

print(format_event_log(events))

from datetime import datetime

class DateFormatter:
    """Flexible date formatter with different styles"""
    
    def __init__(self, dt=None):
        self.dt = dt or datetime.now()
    
    def iso(self):
        return self.dt.strftime('%Y-%m-%d')
    
    def us(self):
        return self.dt.strftime('%m/%d/%Y')
    
    def european(self):
        return self.dt.strftime('%d/%m/%Y')
    
    def readable(self):
        return self.dt.strftime('%B %d, %Y')
    
    def compact(self):
        return self.dt.strftime('%Y%m%d')
    
    def full(self):
        return self.dt.strftime('%A, %B %d, %Y at %I:%M %p')

# Example usage
formatter = DateFormatter()
print(f"ISO: {formatter.iso()}")
print(f"US: {formatter.us()}")
print(f"European: {formatter.european()}")
print(f"Readable: {formatter.readable()}")
print(f"Compact: {formatter.compact()}")
print(f"Full: {formatter.full()}")