题解 | #计算日期到天数转换#

调api。。。

import java.time.LocalDate;
import java.time.temporal.ChronoUnit;
import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int year = sc.nextInt();
        int month = sc.nextInt();
        int day = sc.nextInt();

        LocalDate date = LocalDate.of(year, month, day);
        LocalDate start = LocalDate.of(year, 1, 1);

        System.out.println(ChronoUnit.DAYS.between(start, date)+1);
    }
}