一、时间工具类：

package com.example.mongodbdemo.utils;

import org.apache.commons.lang3.StringUtils;

import java.text.ParseException;
import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.time.*;
import java.util.*;

/**
 * @author qzz
 */
public class DateUtils {

    public static final String DATESHOWFORMAT = "yyyy-MM-dd";
    public static final String DATETIMESHOWFORMAT = "yyyy-MM-dd HH:mm:ss";

    /**
     * 字符串转时间
     */
    public static Date strToDate(String date,String formats){
        SimpleDateFormat sdf = new SimpleDateFormat(formats);
        ParsePosition parsePosition = new ParsePosition(0);
        return sdf.parse(date,parsePosition);
    }

    /**
     * 获得某天最小时间 2022-06-08 00:00:00
     */
    public static Date getStartOfDay(Date date) {
        LocalDateTime localDateTime = LocalDateTime.ofInstant(Instant.ofEpochMilli(date.getTime()), ZoneId.systemDefault());
        LocalDateTime startOfDay = localDateTime.with(LocalTime.MIN);
        return Date.from(startOfDay.atZone(ZoneId.systemDefault()).toInstant());
    }

    /**
     * 获得某天最大时间  如：2022-06-08 23:59:59
     */
    public static Date getEndOfDay(Date date) {
        LocalDateTime localDateTime = LocalDateTime.ofInstant(Instant.ofEpochMilli(date.getTime()), ZoneId.systemDefault());;
        LocalDateTime endOfDay = localDateTime.with(LocalTime.MAX);
        return Date.from(endOfDay.atZone(ZoneId.systemDefault()).toInstant());
    }


    /**
     * 日期格式化(Date转换为String)
     *
     * @param _date
     *            日期
     * @param patternString
     *            处理结果日期的显示格式，如："YYYY-MM-DD"
     * @return
     */
    public static String getDateString(Date _date, String patternString) {
        String dateString = "";
        if (_date != null) {
            SimpleDateFormat formatter = new SimpleDateFormat(patternString);
            dateString = formatter.format(_date);
        }
        return dateString;
    }


    /**
     * 获取指定月第一天
     *
     * @return
     */
    public static Date getFirstThisDate(Date date) {
        Calendar ca = Calendar.getInstance();
        ca.setTime(date);
        ca.set(Calendar.DAY_OF_MONTH, 1);
        Date firstDate = ca.getTime();
        String dateString = getDateString(firstDate, DATESHOWFORMAT);
        return getDateToString(dateString, DATESHOWFORMAT);
    }

    /**
     * 获取指定时间的月份最后一天
     * @param date
     * @return
     */
    public static Date getLastThisDate(Date date)
    {
        int year = getYear(date);
        int month = getMonth(date);
        Calendar cal = Calendar.getInstance();
        //设置年份
        cal.set(Calendar.YEAR,year);
        //设置月份
        cal.set(Calendar.MONTH, month-1);
        //获取某月最大天数
        int lastDay = cal.getActualMaximum(Calendar.DAY_OF_MONTH);
        //设置日历中月份的最大天数
        cal.set(Calendar.DAY_OF_MONTH, lastDay);
        //格式化日期
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        String lastDayOfMonth = sdf.format(cal.getTime()) + " 23:59:59";
        return getDateToString(lastDayOfMonth, DATETIMESHOWFORMAT);
    }


    /**
     * 获取日期的年
     *
     * @param date
     * @return
     */
    public static int getYear(Date date) {
        Calendar ca = Calendar.getInstance();
        ca.setTime(date);
        return ca.get(Calendar.YEAR);
    }

    /**
     * 获取日期的月
     *
     * @param date
     * @return
     */
    public static int getMonth(Date date) {
        Calendar ca = Calendar.getInstance();
        ca.setTime(date);
        return ca.get(Calendar.MONTH) + 1;
    }

    /**
     * 获取日期的日
     *
     * @param date
     * @return
     */
    public static int getDay(Date date) {
        Calendar ca = Calendar.getInstance();
        ca.setTime(date);
        return ca.get(Calendar.DATE);
    }


    /**
     * 日期格式化(String转换为Date)
     *
     * @param dateStr
     *            日期字符串
     * @param patten
     *            处理结果日期的显示格式，如："YYYY-MM-DD"
     * @return
     */
    public static Date getDateToString(String dateStr, String patten) {
        if (StringUtils.isBlank(dateStr)) {
            return null;
        }
        SimpleDateFormat formatter = new SimpleDateFormat(patten, Locale.CHINA);
        try {
            return formatter.parse(dateStr);
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 打印指定年份的第一天
     *
     * @param year 年份
     */
    public static String getFirstDateForYear(int year) {
        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.YEAR, year);
        calendar.set(Calendar.MONTH, calendar.getActualMinimum(Calendar.MONTH));
        calendar.set(Calendar.DAY_OF_MONTH, calendar.getActualMinimum(Calendar.DAY_OF_MONTH));
        return new SimpleDateFormat("yyyy-MM-dd").format(calendar.getTime());
    }

    /**
     * 打印指定年份的最后一天
     *
     * @param year 年份
     */
    public static String getLastDateForYear(int year) {
        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.YEAR, year);
        calendar.set(Calendar.MONTH, calendar.getActualMaximum(Calendar.MONTH));
        calendar.set(Calendar.DAY_OF_MONTH, calendar.getActualMaximum(Calendar.DAY_OF_MONTH));
        return  new SimpleDateFormat("yyyy-MM-dd").format(calendar.getTime());
    }

    // 获得当前周- 周一的日期
    public static List<String> getTimeInterval(int days) {
        LocalDate begin = LocalDate.now().minusDays(days - 1 );
        List<String> list = new ArrayList();
        for (int i = 0; i < days; i++) {
            list.add(begin.toString());
            begin = begin.plusDays(1);
        }
        return list;
    }


    /**
     * 时间字符串截取 日期值
     */
    public static String strToDateValue(String date){
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        ParsePosition parsePosition = new ParsePosition(0);
        return sdf.format(sdf.parse(date,parsePosition));
    }
}

二、应用

功能：
1.字符串 转 时间
2.时间 转 字符串
3.指定月的第一天、最后一天
4.指定年的第一天、最后一天
5.近30天的第一天、最后一天
6.近7天的第一天、最后一天

package com.example.mongodbdemo.utils;

import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.ZoneId;
import java.time.format.DateTimeFormatter;
import java.util.Date;
import java.util.List;

/**
 * @author qzz
 */
public class DateUtilsTest {

    public static void main(String[] args) {

        //1.字符串 转 时间
        String time ="2022-06-09 15:53:00";
        Date date = DateUtils.strToDate(time,"yyyy-MM-dd HH:mm:ss");
        System.out.println("字符串 转 时间:"+date);

        //2.时间 转 字符串
        Date now = new Date();
        String nowStr = DateUtils.getDateString(now,"yyyy-MM-dd");
        System.out.println("时间 转 字符串:"+nowStr);

        //3.指定月的第一天、最后一天
        String t1= DateUtils.getDateString(DateUtils.getFirstThisDate(now),"yyyy-MM-dd");
        String t2= DateUtils.getDateString(DateUtils.getLastThisDate(now),"yyyy-MM-dd");
        System.out.println("获取指定月第一天为：" + t1);
        System.out.println("获取指定月最后一天为：" + t2);

        //4.指定年的第一天、最后一天
        String t11= DateUtils.getFirstDateForYear(2022);
        String t21= DateUtils.getLastDateForYear(2022);
        System.out.println("获取指定年第一天为：" + t11);
        System.out.println("获取指定年最后一天为：" + t21);

        //近30天
        LocalDateTime beginTime;
        LocalDateTime endTime;
        List<String> timeIntervalList;

        beginTime = LocalDateTime.of(LocalDateTime.now().minusDays(29).toLocalDate(), LocalTime.MIN).plusHours(8);
        endTime = LocalDateTime.of(LocalDateTime.now().toLocalDate(), LocalTime.MAX).plusHours(8);
        timeIntervalList = DateUtils.getTimeInterval(30);

        System.out.println("近30天的第一天:"+beginTime.format(DateTimeFormatter.ofPattern("yyyy-MM-dd")));
        System.out.println("近30天的最后一天:"+endTime.format(DateTimeFormatter.ofPattern("yyyy-MM-dd")));
//        timeIntervalList.forEach(t->{
//            System.out.println(t);
//        });

        //近7天
        beginTime = LocalDateTime.of(LocalDateTime.now().minusDays(6).toLocalDate(), LocalTime.MIN).plusHours(8);
        endTime = LocalDateTime.of(LocalDate.now(), LocalTime.MAX).plusHours(8);
        timeIntervalList = DateUtils.getTimeInterval(7);

        System.out.println("近7天的第一天:"+beginTime.format(DateTimeFormatter.ofPattern("yyyy-MM-dd")));
        System.out.println("近7天的最后一天:"+endTime.format(DateTimeFormatter.ofPattern("yyyy-MM-dd")));

    }
}

运行结果：

"D:\Program Files\Java\jdk1.8.0_40\bin\java.exe" "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA 2021.1.3\lib\idea_rt.jar=62512:C:\Program Files\JetBrains\IntelliJ IDEA 2021.1.3\bin" -Dfile.encoding=UTF-8 -classpath "D:\Program Files\Java\jdk1.8.0_40\jre\lib\charsets.jar;D:\Program Files\Java\jdk1.8.0_40\jre\lib\deploy.jar;D:\Program Files\Java\jdk1.8.0_40\jre\lib\ext\access-bridge-64.jar;D:\Program Files\Java\jdk1.8.0_40\jre\lib\ext\cldrdata.jar;D:\Program Files\Java\jdk1.8.0_40\jre\lib\ext\dnsns.jar;D:\Program Files\Java\jdk1.8.0_40\jre\lib\ext\jaccess.jar;D:\Program Files\Java\jdk1.8.0_40\jre\lib\ext\jfxrt.jar;D:\Program Files\Java\jdk1.8.0_40\jre\lib\ext\localedata.jar;D:\Program Files\Java\jdk1.8.0_40\jre\lib\ext\nashorn.jar;D:\Program Files\Java\jdk1.8.0_40\jre\lib\ext\sunec.jar;D:\Program Files\Java\jdk1.8.0_40\jre\lib\ext\sunjce_provider.jar;D:\Program Files\Java\jdk1.8.0_40\jre\lib\ext\sunmscapi.jar;D:\Program Files\Java\jdk1.8.0_40\jre\lib\ext\sunpkcs11.jar;D:\Program Files\Java\jdk1.8.0_40\jre\lib\ext\zipfs.jar;D:\Program Files\Java\jdk1.8.0_40\jre\lib\javaws.jar;D:\Program Files\Java\jdk1.8.0_40\jre\lib\jce.jar;D:\Program Files\Java\jdk1.8.0_40\jre\lib\jfr.jar;D:\Program Files\Java\jdk1.8.0_40\jre\lib\jfxswt.jar;D:\Program Files\Java\jdk1.8.0_40\jre\lib\jsse.jar;D:\Program Files\Java\jdk1.8.0_40\jre\lib\management-agent.jar;D:\Program Files\Java\jdk1.8.0_40\jre\lib\plugin.jar;D:\Program Files\Java\jdk1.8.0_40\jre\lib\resources.jar;D:\Program Files\Java\jdk1.8.0_40\jre\lib\rt.jar;F:\study-project\mongodb-demo\target\classes;D:\mvnrepository\org\springframework\boot\spring-boot-starter-web\2.6.7\spring-boot-starter-web-2.6.7.jar;D:\mvnrepository\org\springframework\boot\spring-boot-starter\2.6.7\spring-boot-starter-2.6.7.jar;D:\mvnrepository\org\springframework\boot\spring-boot-starter-logging\2.6.7\spring-boot-starter-logging-2.6.7.jar;D:\mvnrepository\ch\qos\logback\logback-classic\1.2.11\logback-classic-1.2.11.jar;D:\mvnrepository\ch\qos\logback\logback-core\1.2.11\logback-core-1.2.11.jar;D:\mvnrepository\org\apache\logging\log4j\log4j-to-slf4j\2.17.2\log4j-to-slf4j-2.17.2.jar;D:\mvnrepository\org\apache\logging\log4j\log4j-api\2.17.2\log4j-api-2.17.2.jar;D:\mvnrepository\org\slf4j\jul-to-slf4j\1.7.36\jul-to-slf4j-1.7.36.jar;D:\mvnrepository\jakarta\annotation\jakarta.annotation-api\1.3.5\jakarta.annotation-api-1.3.5.jar;D:\mvnrepository\org\yaml\snakeyaml\1.29\snakeyaml-1.29.jar;D:\mvnrepository\org\springframework\boot\spring-boot-starter-json\2.6.7\spring-boot-starter-json-2.6.7.jar;D:\mvnrepository\com\fasterxml\jackson\core\jackson-databind\2.13.2.1\jackson-databind-2.13.2.1.jar;D:\mvnrepository\com\fasterxml\jackson\core\jackson-annotations\2.13.2\jackson-annotations-2.13.2.jar;D:\mvnrepository\com\fasterxml\jackson\core\jackson-core\2.13.2\jackson-core-2.13.2.jar;D:\mvnrepository\com\fasterxml\jackson\datatype\jackson-datatype-jdk8\2.13.2\jackson-datatype-jdk8-2.13.2.jar;D:\mvnrepository\com\fasterxml\jackson\datatype\jackson-datatype-jsr310\2.13.2\jackson-datatype-jsr310-2.13.2.jar;D:\mvnrepository\com\fasterxml\jackson\module\jackson-module-parameter-names\2.13.2\jackson-module-parameter-names-2.13.2.jar;D:\mvnrepository\org\springframework\boot\spring-boot-starter-tomcat\2.6.7\spring-boot-starter-tomcat-2.6.7.jar;D:\mvnrepository\org\apache\tomcat\embed\tomcat-embed-core\9.0.62\tomcat-embed-core-9.0.62.jar;D:\mvnrepository\org\apache\tomcat\embed\tomcat-embed-el\9.0.62\tomcat-embed-el-9.0.62.jar;D:\mvnrepository\org\apache\tomcat\embed\tomcat-embed-websocket\9.0.62\tomcat-embed-websocket-9.0.62.jar;D:\mvnrepository\org\springframework\spring-web\5.3.19\spring-web-5.3.19.jar;D:\mvnrepository\org\springframework\spring-beans\5.3.19\spring-beans-5.3.19.jar;D:\mvnrepository\org\springframework\spring-webmvc\5.3.19\spring-webmvc-5.3.19.jar;D:\mvnrepository\org\springframework\spring-aop\5.3.19\spring-aop-5.3.19.jar;D:\mvnrepository\org\springframework\spring-context\5.3.19\spring-context-5.3.19.jar;D:\mvnrepository\org\springframework\spring-expression\5.3.19\spring-expression-5.3.19.jar;D:\mvnrepository\org\springframework\boot\spring-boot-devtools\2.6.7\spring-boot-devtools-2.6.7.jar;D:\mvnrepository\org\springframework\boot\spring-boot\2.6.7\spring-boot-2.6.7.jar;D:\mvnrepository\org\springframework\boot\spring-boot-autoconfigure\2.6.7\spring-boot-autoconfigure-2.6.7.jar;D:\mvnrepository\org\projectlombok\lombok\1.18.24\lombok-1.18.24.jar;D:\mvnrepository\org\slf4j\slf4j-api\1.7.36\slf4j-api-1.7.36.jar;D:\mvnrepository\org\springframework\spring-core\5.3.19\spring-core-5.3.19.jar;D:\mvnrepository\org\springframework\spring-jcl\5.3.19\spring-jcl-5.3.19.jar;D:\mvnrepository\org\springframework\boot\spring-boot-starter-data-mongodb\2.6.7\spring-boot-starter-data-mongodb-2.6.7.jar;D:\mvnrepository\org\mongodb\mongodb-driver-sync\4.4.2\mongodb-driver-sync-4.4.2.jar;D:\mvnrepository\org\mongodb\bson\4.4.2\bson-4.4.2.jar;D:\mvnrepository\org\mongodb\mongodb-driver-core\4.4.2\mongodb-driver-core-4.4.2.jar;D:\mvnrepository\org\springframework\data\spring-data-mongodb\3.3.4\spring-data-mongodb-3.3.4.jar;D:\mvnrepository\org\springframework\spring-tx\5.3.19\spring-tx-5.3.19.jar;D:\mvnrepository\org\springframework\data\spring-data-commons\2.6.4\spring-data-commons-2.6.4.jar;D:\mvnrepository\org\apache\commons\commons-lang3\3.7\commons-lang3-3.7.jar" com.example.mongodbdemo.utils.DateUtilsTest
字符串 转 时间:Thu Jun 09 15:53:00 CST 2022
时间 转 字符串:2022-06-09
获取指定月第一天为：2022-06-01
获取指定月最后一天为：2022-06-30
获取指定年第一天为：2022-01-01
获取指定年最后一天为：2022-12-31
近30天的第一天:2022-05-11
近30天的最后一天:2022-06-10
近7天的第一天:2022-06-03
近7天的最后一天:2022-06-10

Process finished with exit code 0

功能：
1.本日 开始时间 结束时间
2.本月 开始时间 结束时间
3.本年 开始时间 结束时间

package com.example.mongodbdemo.utils;

import java.time.LocalDateTime;
import java.util.Date;

/**
 * @author qzz
 */
public class DateUtilsTest1 {

    public static void main(String[] args) {
        Date now = new Date();

        LocalDateTime localDateTime = LocalDateTime.now();

        //本日 开始时间 2022-06-08 00:00:00
        String begin = DateUtils.getDateString(DateUtils.getStartOfDay(now),"yyyy-MM-dd HH:mm:ss");
        //本日 结束时间 2022-06-08 23:59:59
        String end = DateUtils.getDateString(DateUtils.getEndOfDay(now),"yyyy-MM-dd HH:mm:ss");
        System.out.println("本日 开始时间:"+begin);
        System.out.println("本日 结束时间:"+end);

        //本月 第一天  如：2022-06-01
        String startTime11= DateUtils.getDateString(DateUtils.getFirstThisDate(now),"yyyy-MM-dd HH:mm:ss");
        //本月 最后一天  如：2022-06-30
        String endTime11= DateUtils.getDateString(DateUtils.getLastThisDate(now),"yyyy-MM-dd HH:mm:ss");
        System.out.println("本月 开始时间:"+startTime11);
        System.out.println("本月 结束时间:"+endTime11);

        //本年 开始时间 如：2022-01-01 00:00:00
        String startTime1= DateUtils.getFirstDateForYear(localDateTime.getYear())+" 00:00:00";
        //本年 结束时间 如：2022-12-31 23:59:59
        String endTime1= DateUtils.getLastDateForYear(localDateTime.getYear())+" 23:59:59";
        System.out.println("本年 开始时间:"+startTime1);
        System.out.println("本年 结束时间:"+endTime1);

    }
}

"D:\Program Files\Java\jdk1.8.0_40\bin\java.exe" "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA 2021.1.3\lib\idea_rt.jar=62555:C:\Program Files\JetBrains\IntelliJ IDEA 2021.1.3\bin" -Dfile.encoding=UTF-8 -classpath "D:\Program Files\Java\jdk1.8.0_40\jre\lib\charsets.jar;D:\Program Files\Java\jdk1.8.0_40\jre\lib\deploy.jar;D:\Program Files\Java\jdk1.8.0_40\jre\lib\ext\access-bridge-64.jar;D:\Program Files\Java\jdk1.8.0_40\jre\lib\ext\cldrdata.jar;D:\Program Files\Java\jdk1.8.0_40\jre\lib\ext\dnsns.jar;D:\Program Files\Java\jdk1.8.0_40\jre\lib\ext\jaccess.jar;D:\Program Files\Java\jdk1.8.0_40\jre\lib\ext\jfxrt.jar;D:\Program Files\Java\jdk1.8.0_40\jre\lib\ext\localedata.jar;D:\Program Files\Java\jdk1.8.0_40\jre\lib\ext\nashorn.jar;D:\Program Files\Java\jdk1.8.0_40\jre\lib\ext\sunec.jar;D:\Program Files\Java\jdk1.8.0_40\jre\lib\ext\sunjce_provider.jar;D:\Program Files\Java\jdk1.8.0_40\jre\lib\ext\sunmscapi.jar;D:\Program Files\Java\jdk1.8.0_40\jre\lib\ext\sunpkcs11.jar;D:\Program Files\Java\jdk1.8.0_40\jre\lib\ext\zipfs.jar;D:\Program Files\Java\jdk1.8.0_40\jre\lib\javaws.jar;D:\Program Files\Java\jdk1.8.0_40\jre\lib\jce.jar;D:\Program Files\Java\jdk1.8.0_40\jre\lib\jfr.jar;D:\Program Files\Java\jdk1.8.0_40\jre\lib\jfxswt.jar;D:\Program Files\Java\jdk1.8.0_40\jre\lib\jsse.jar;D:\Program Files\Java\jdk1.8.0_40\jre\lib\management-agent.jar;D:\Program Files\Java\jdk1.8.0_40\jre\lib\plugin.jar;D:\Program Files\Java\jdk1.8.0_40\jre\lib\resources.jar;D:\Program 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com.example.mongodbdemo.utils.DateUtilsTest1
本日 开始时间:2022-06-09 00:00:00
本日 结束时间:2022-06-09 23:59:59
本月 开始时间:2022-06-01 00:00:00
本月 结束时间:2022-06-30 23:59:59
本年 开始时间:2022-01-01 00:00:00
本年 结束时间:2022-12-31 23:59:59

Process finished with exit code 0