Given a month (1-12) and a year, return the number of days in that month. Account for leap years when calculating the days in February. A year is a leap year if it is divisible by 4 but not by 100, or if it is divisible by 400.
Examples:
Input: month = 2, year = 2024
Output: 29
Explanation: 2024 is a leap year, so February has 29 days
Input: month = 2, year = 2023
Output: 28
Explanation: 2023 is not a leap year, so February has 28 days
Input: month = 1, year = 2024
Output: 31
Explanation: January always has 31 days
Input: month = 4, year = 2024
Output: 30
Explanation: April always has 30 days
Input: month = 12, year = 2024
Output: 31
Explanation: December always has 31 days
Apex Code Editor
Welcome to Lightning Challenge!
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 September 2026 (Sep 1–15)Sponsored by FLXBL
Contest runs September 1 - 15. Complete challenges to climb the leaderboard!
1st & 2nd: Salesforce certification exam voucher — see all prizes
Only the 15 daily challenges shown during this contest count toward points. Earlier dailies don't carry over.