LocalDateTime 七天后

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

public class Main {
  public static void main(String[] args) {
    LocalDateTime now = LocalDateTime.now();
    LocalDateTime after7Days = now.plusDays(7);
    DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
    String formattedAfter7Days = after7Days.format(formatter);
    System.out.println("七天后的时间为：" + formattedAfter7Days);
  }
}

输出：

七天后的时间为：2022-02-22 16:08:23