Business Days Between Two Dates

/*
 * Problem : Count weekdays.
 * Input   : Two dates.
 * Output  : Number of weekdays.
 * Approach: Walk day by day.
 * Time    : O(days)
 * Space   : O(1)
 * Java    : 8 or newer.
 */
import java.util.Scanner;

public class Main {
    // This method solves the task. It receives the input and returns the answer.
    static long solve(String a, String b) {
        // Step 1: Walk from the first date to the day before the second date and count the weekdays.
        java.time.LocalDate day = java.time.LocalDate.parse(a);
        java.time.LocalDate end = java.time.LocalDate.parse(b);
        long count = 0;
        while (day.isBefore(end)) {
            java.time.DayOfWeek weekday = day.getDayOfWeek();
            if (weekday != java.time.DayOfWeek.SATURDAY && weekday != java.time.DayOfWeek.SUNDAY) {
                count++;
            }
            day = day.plusDays(1);
        }
        return count;
    }

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String a = scanner.next();
        String b = scanner.next();
        System.out.println(solve(a, b));
    }
}