从Instant获取每月的第一天和最后一天

import java.time.*;
import java.time.temporal.TemporalAdjusters;

public class MonthBoundaries {
    public static void main(String[] args) {
        // 获取当前时间
        Instant now = Instant.now();
        LocalDate date = now.atZone(ZoneId.systemDefault()).toLocalDate();

        // 获取当前月的第一天
        LocalDate firstDayOfMonth = date.with(TemporalAdjusters.firstDayOfMonth());
        System.out.println("First day of the month: " + firstDayOfMonth);

        // 获取当前月的最后一天
        LocalDate lastDayOfMonth = date.with(TemporalAdjusters.lastDayOfMonth());
        System.out.println("Last day of the month: " + lastDayOfMonth);
    }
}