21 Hours Ago

// PHP
// Get time from 21 hours ago
$pastDate = date('Y-m-d H:i:s', strtotime('-21 hours'));

// Get time 21 hours from now
$futureDate = date('Y-m-d H:i:s', strtotime('+21 hours'));

// Using DateTime (recommended approach)
$date = new DateTime();
$date->modify('-21 hours');
echo $date->format('Y-m-d H:i:s');

// JavaScript
// Get time from 21 hours ago
const pastDate = new Date(Date.now() - 21 * 60 * 60 * 1000);

// Get time 21 hours from now
const futureDate = new Date(Date.now() + 21 * 60 * 60 * 1000);

// Alternative approach using date methods
const date = new Date();
date.setHours(date.getHours() - 21);
console.log(date.toISOString());

# Python
from datetime import datetime, timedelta

# Get time from 21 hours ago
past_date = datetime.now() - timedelta(hours=21)

# Get time 21 hours from now
future_date = datetime.now() + timedelta(hours=21)

# Format the dates
print(past_date.strftime('%Y-%m-%d %H:%M:%S'))
print(future_date.strftime('%Y-%m-%d %H:%M:%S'))