Business Days Between

How It Works

JavaScript's getDay() returns:

• 0 = Sunday
• 1-5 = Monday-Friday (business days)
• 6 = Saturday

The loop iterates through each day and counts only weekdays.

Example Calculation

January 2024 Su Mo Tu We Th Fr Sa 1 2 3 4 5 6 ← Jan 1-5: 5 business days 7 8 9 10 11 12 13 ← Jan 8-12: 5 business days 14 15 ... ← Jan 15: 1 business day (Mon) Jan 1 to Jan 15 = 10 business days

Common Use Cases

What This Doesn't Include

Holidays

This snippet only excludes weekends. For accurate business day calculations, you'll need to add holiday handling:

const holidays = [
  '2024-01-01',  // New Year
  '2024-12-25',  // Christmas
  // ...
];

// In the loop:
const dateStr = d.toISOString().split('T')[0];
if (day !== 0 && day !== 6 && !holidays.includes(dateStr)) {
  count++;
}

Regional Differences

• Middle East: Friday-Saturday weekend
• Some countries: Saturday is a half-day
• Varies by industry: Banks, government, retail have different schedules

Performance Note

For large date ranges, consider an O(1) formula-based approach instead of looping:

// Formula approach (faster for large ranges):
// Calculate full weeks × 5 + remaining weekdays

This loop approach is simple and correct for most use cases (ranges under a few years).