Write a method that calculates the number of business days (Monday through Friday) between two dates, inclusive of both start and end dates if they are business days.

Exclude weekends (Saturday and Sunday) from the count. Handle edge cases like null inputs and invalid date ranges appropriately.

Examples:

Integer days = calculateBusinessDays(Date.newInstance(2024, 1, 1), Date.newInstance(2024, 1, 5));
// Returns: 5 (Monday to Friday)

Integer weekend = calculateBusinessDays(Date.newInstance(2024, 1, 6), Date.newInstance(2024, 1, 7));
// Returns: 0 (Saturday to Sunday)

Integer invalid = calculateBusinessDays(Date.newInstance(2024, 1, 5), Date.newInstance(2024, 1, 1));
// Returns: 0 (end date before start date)
Apex Code Editor
Sign in to Submit

Welcome to Lightning Challenge!

Create an Account

Sign up to track your progress, earn points, and compete with others. Your solutions will be saved automatically.

Create account

How It Works

  • • Write your solution in the code editor
  • • Connect your Salesforce org to test
  • • Submit to check if your solution passes
  • • Use hints if you get stuck

Contest Alert

🏆 #CodeEveryDay Feb 2026

Contest runs February 1 - 28. Complete challenges to climb the leaderboard!

Points are calculated for challenges completed during the contest period.