ZonedDateTime

import java.time.ZonedDateTime;
import java.time.temporal.ChronoUnit;
import java.util.Date;

public class test {

    public static void main(String[] args) {

        final ZonedDateTime now = ZonedDateTime.now(); //当前时间
        System.out.println("now：" + now);
        final ZonedDateTime todayZero = now.truncatedTo(ChronoUnit.DAYS); //今天的0点
        System.out.println("todayZero：" + todayZero);
        final ZonedDateTime tomorrowZero = todayZero.plusDays(1); //明天的0点
        System.out.println("tomorrowZero：" + tomorrowZero);
        final ZonedDateTime firstDayOfMonth = todayZero.withDayOfMonth(1); //当月1号0点
        System.out.println("firstDayOfMonth：" + firstDayOfMonth);
        final ZonedDateTime nextDayOfMonth = firstDayOfMonth.plusMonths(1);//下月1号0点
        System.out.println("nextDayOfMonth：" + nextDayOfMonth);
        final Date date = Date.from(todayZero.toInstant()); //ZoneDateTime 转换成Date
        System.out.println("date：" + date);
    }
}

ZonedDateTime.jpg