原创

java 获取当天0点0分0秒(00:00:00)+Calendar工具类

    /** * 获取当天0点0分0秒(00:00:00) * * @return */
    private static String getTimesmorning() {
        Calendar cal = Calendar.getInstance();
        cal.set(cal.get(Calendar.YEAR), cal.get(Calendar.MONTH), cal.get(Calendar.DAY_OF_MONTH), 0, 0, 0);
        Date beginOfDate = cal.getTime();
        SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        return formatter.format(beginOfDate);
    }

package com.boluo.util;

import java.text.DateFormat;
import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;

/** * 常用日历操作辅助类 * * @author steven 2010-08-10 * @email:qing.tan@iwode.com */
public class CalendarUtil {

    private int weeks = 0;// 用来全局控制 上一周,本周,下一周的周数变化 
    private int MaxDate; // 一月最大天数 
    private int MaxYear; // 一年最大天数 

    /** * 测试 * * @param args */
    public static void main(String[] args) {
        CalendarUtil tt = new CalendarUtil();
        System.out.println("获取当天日期:" + tt.getNowTime("yyyy-MM-dd"));
        System.out.println("获取本周一日期:" + tt.getMondayOFWeek());
        System.out.println("获取本周日的日期~:" + tt.getCurrentWeekday());
        System.out.println("获取上周一日期:" + tt.getPreviousWeekday());
        System.out.println("获取上周日日期:" + tt.getPreviousWeekSunday());
        System.out.println("获取下周一日期:" + tt.getNextMonday());
        System.out.println("获取下周日日期:" + tt.getNextSunday());
        System.out.println("获得相应周的周六的日期:" + tt.getNowTime("yyyy-MM-dd"));
        System.out.println("获取本月第一天日期:" + tt.getFirstDayOfMonth());
        System.out.println("获取本月最后一天日期:" + tt.getDefaultDay());
        System.out.println("获取上月第一天日期:" + tt.getPreviousMonthFirst());
        System.out.println("获取上月最后一天的日期:" + tt.getPreviousMonthEnd());
        System.out.println("获取下月第一天日期:" + tt.getNextMonthFirst());
        System.out.println("获取下月最后一天日期:" + tt.getNextMonthEnd());
        System.out.println("获取本年的第一天日期:" + tt.getCurrentYearFirst());
        System.out.println("获取本年最后一天日期:" + tt.getCurrentYearEnd());
        System.out.println("获取去年的第一天日期:" + tt.getPreviousYearFirst());
        System.out.println("获取去年的最后一天日期:" + tt.getPreviousYearEnd());
        System.out.println("获取明年第一天日期:" + tt.getNextYearFirst());
        System.out.println("获取明年最后一天日期:" + tt.getNextYearEnd());
        System.out.println("获取本季度第一天:" + tt.getThisSeasonFirstTime(11));
        System.out.println("获取本季度最后一天:" + tt.getThisSeasonFinallyTime(11));
        System.out.println("获取两个日期之间间隔天数2008-12-1~2008-29:"
                + CalendarUtil.getTwoDay("2008-12-1", "2008-9-29"));
        System.out.println("获取当前月的第几周:" + tt.getWeekOfMonth());
        System.out.println("获取当前年份:" + tt.getYear());
        System.out.println("获取当前月份:" + tt.getMonth());
        System.out.println("获取今天在本年的第几天:" + tt.getDayOfYear());
        System.out.println("获得今天在本月的第几天(获得当前日):" + tt.getDayOfMonth());
        System.out.println("获得今天在本周的第几天:" + tt.getDayOfWeek());
        System.out.println("获得半年后的日期:"
                + tt.convertDateToString(tt.getTimeYearNext()));
    }

    /** * 获得当前年份 * * @return */
    public static int getYear() {
        return Calendar.getInstance().get(Calendar.YEAR);
    }

    /** * 获得当前月份 * * @return */
    public static int getMonth() {
        return Calendar.getInstance().get(Calendar.MONTH) + 1;
    }

    /** * 获得今天在本年的第几天 * * @return */
    public static int getDayOfYear() {
        return Calendar.getInstance().get(Calendar.DAY_OF_YEAR);
    }

    /** * 获得今天在本月的第几天(获得当前日) * * @return */
    public static int getDayOfMonth() {
        return Calendar.getInstance().get(Calendar.DAY_OF_MONTH);
    }

    /** * 获得今天在本周的第几天 * * @return */
    public static int getDayOfWeek() {
        return Calendar.getInstance().get(Calendar.DAY_OF_WEEK);
    }

    /** * 获得今天是这个月的第几周 * * @return */
    public static int getWeekOfMonth() {
        return Calendar.getInstance().get(Calendar.DAY_OF_WEEK_IN_MONTH);
    }

    /** * 获得半年后的日期 * * @return */
    public static Date getTimeYearNext() {
        Calendar.getInstance().add(Calendar.DAY_OF_YEAR, 183);
        return Calendar.getInstance().getTime();
    }

    /** * 将日期转换成字符串 * * @param dateTime * @return */
    public static String convertDateToString(Date dateTime) {
        SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
        return df.format(dateTime);
    }

    /** * 得到二个日期间的间隔天数 * * @param sj1 * @param sj2 * @return */
    public static String getTwoDay(String sj1, String sj2) {
        SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd");
        long day = 0;
        try {
            java.util.Date date = myFormatter.parse(sj1);
            java.util.Date mydate = myFormatter.parse(sj2);
            day = (date.getTime() - mydate.getTime()) / (24 * 60 * 60 * 1000);
        } catch (Exception e) {
            return "";
        }
        return day + "";
    }

    /** * 根据一个日期,返回是星期几的字符串 * * @param sdate * @return */
    public static String getWeek(String sdate) {
        // 再转换为时间 
        Date date = CalendarUtil.strToDate(sdate);
        Calendar c = Calendar.getInstance();
        c.setTime(date);
        // int hour=c.get(Calendar.DAY_OF_WEEK); 
        // hour中存的就是星期几了,其范围 1~7 
        // 1=星期日 7=星期六,其他类推 
        return new SimpleDateFormat("EEEE").format(c.getTime());
    }

    /** * 将短时间格式字符串转换为时间 yyyy-MM-dd * * @param strDate * @return */
    public static Date strToDate(String strDate) {
        SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
        ParsePosition pos = new ParsePosition(0);
        Date strtodate = formatter.parse(strDate, pos);
        return strtodate;
    }

    /** * 两个时间之间的天数 * * @param date1 * @param date2 * @return */
    public static long getDays(String date1, String date2) {
        if (date1 == null || date1.equals(""))
            return 0;
        if (date2 == null || date2.equals(""))
            return 0;
        // 转换为标准时间 
        SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd");
        java.util.Date date = null;
        java.util.Date mydate = null;
        try {
            date = myFormatter.parse(date1);
            mydate = myFormatter.parse(date2);
        } catch (Exception e) {
        }
        long day = (date.getTime() - mydate.getTime()) / (24 * 60 * 60 * 1000);
        return day;
    }

    /** * 计算当月最后一天,返回字符串 * * @return */
    public String getDefaultDay() {
        String str = "";
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

        Calendar lastDate = Calendar.getInstance();
        lastDate.set(Calendar.DATE, 1);// 设为当前月的1号 
        lastDate.add(Calendar.MONTH, 1);// 加一个月,变为下月的1号 
        lastDate.add(Calendar.DATE, -1);// 减去一天,变为当月最后一天 

        str = sdf.format(lastDate.getTime());
        return str;
    }

    /** * 上月第一天 * * @return */
    public String getPreviousMonthFirst() {
        String str = "";
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

        Calendar lastDate = Calendar.getInstance();
        lastDate.set(Calendar.DATE, 1);// 设为当前月的1号 
        lastDate.add(Calendar.MONTH, -1);// 减一个月,变为下月的1号 
        // lastDate.add(Calendar.DATE,-1);//减去一天,变为当月最后一天 

        str = sdf.format(lastDate.getTime());
        return str;
    }

    /** * 获取当月第一天 * * @return */
    public String getFirstDayOfMonth() {
        String str = "";
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

        Calendar lastDate = Calendar.getInstance();
        lastDate.set(Calendar.DATE, 1);// 设为当前月的1号 
        str = sdf.format(lastDate.getTime());
        return str;
    }

    /** * 获得本周星期日的日期 * * @return */
    public String getCurrentWeekday() {
        weeks = 0;
        int mondayPlus = this.getMondayPlus();
        GregorianCalendar currentDate = new GregorianCalendar();
        currentDate.add(GregorianCalendar.DATE, mondayPlus + 6);
        Date monday = currentDate.getTime();

        DateFormat df = DateFormat.getDateInstance();
        String preMonday = df.format(monday);
        return preMonday;
    }

    /** * 获取当天时间 * * @param dateformat * @return */
    public String getNowTime(String dateformat) {
        Date now = new Date();
        SimpleDateFormat dateFormat = new SimpleDateFormat(dateformat);// 可以方便地修改日期格式 
        String hehe = dateFormat.format(now);
        return hehe;
    }

    /** * 获得当前日期与本周日相差的天数 * * @return */
    private int getMondayPlus() {
        Calendar cd = Calendar.getInstance();
        // 获得今天是一周的第几天,星期日是第一天,星期二是第二天...... 
        int dayOfWeek = cd.get(Calendar.DAY_OF_WEEK) - 1; // 因为按中国礼拜一作为第一天所以这里减1 
        if (dayOfWeek == 1) {
            return 0;
        } else {
            return 1 - dayOfWeek;
        }
    }

    /** * 获得本周一的日期 * * @return */
    public String getMondayOFWeek() {
        weeks = 0;
        int mondayPlus = this.getMondayPlus();
        GregorianCalendar currentDate = new GregorianCalendar();
        currentDate.add(GregorianCalendar.DATE, mondayPlus);
        Date monday = currentDate.getTime();

        DateFormat df = DateFormat.getDateInstance();
        String preMonday = df.format(monday);
        return preMonday;
    }

    /** * 获得相应周的周六的日期 * * @return */
    public String getSaturday() {
        int mondayPlus = this.getMondayPlus();
        GregorianCalendar currentDate = new GregorianCalendar();
        currentDate.add(GregorianCalendar.DATE, mondayPlus + 7 * weeks + 6);
        Date monday = currentDate.getTime();
        DateFormat df = DateFormat.getDateInstance();
        String preMonday = df.format(monday);
        return preMonday;
    }

    /** * 获得上周星期日的日期 * * @return */
    public String getPreviousWeekSunday() {
        weeks = 0;
        weeks--;
        int mondayPlus = this.getMondayPlus();
        GregorianCalendar currentDate = new GregorianCalendar();
        currentDate.add(GregorianCalendar.DATE, mondayPlus + weeks);
        Date monday = currentDate.getTime();
        DateFormat df = DateFormat.getDateInstance();
        String preMonday = df.format(monday);
        return preMonday;
    }

    /** * 获得上周星期一的日期 * * @return */
    public String getPreviousWeekday() {
        weeks--;
        int mondayPlus = this.getMondayPlus();
        GregorianCalendar currentDate = new GregorianCalendar();
        currentDate.add(GregorianCalendar.DATE, mondayPlus + 7 * weeks);
        Date monday = currentDate.getTime();
        DateFormat df = DateFormat.getDateInstance();
        String preMonday = df.format(monday);
        return preMonday;
    }

    /** * 获得下周星期一的日期 */
    public String getNextMonday() {
        weeks++;
        int mondayPlus = this.getMondayPlus();
        GregorianCalendar currentDate = new GregorianCalendar();
        currentDate.add(GregorianCalendar.DATE, mondayPlus + 7);
        Date monday = currentDate.getTime();
        DateFormat df = DateFormat.getDateInstance();
        String preMonday = df.format(monday);
        return preMonday;
    }

    /** * 获得下周星期日的日期 */
    public String getNextSunday() {

        int mondayPlus = this.getMondayPlus();
        GregorianCalendar currentDate = new GregorianCalendar();
        currentDate.add(GregorianCalendar.DATE, mondayPlus + 7 + 6);
        Date monday = currentDate.getTime();
        DateFormat df = DateFormat.getDateInstance();
        String preMonday = df.format(monday);
        return preMonday;
    }

    private int getMonthPlus() {
        Calendar cd = Calendar.getInstance();
        int monthOfNumber = cd.get(Calendar.DAY_OF_MONTH);
        cd.set(Calendar.DATE, 1);// 把日期设置为当月第一天 
        cd.roll(Calendar.DATE, -1);// 日期回滚一天,也就是最后一天 
        MaxDate = cd.get(Calendar.DATE);
        if (monthOfNumber == 1) {
            return -MaxDate;
        } else {
            return 1 - monthOfNumber;
        }
    }

    /** * 获得上月最后一天的日期 * * @return */
    public String getPreviousMonthEnd() {
        String str = "";
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

        Calendar lastDate = Calendar.getInstance();
        lastDate.add(Calendar.MONTH, -1);// 减一个月 
        lastDate.set(Calendar.DATE, 1);// 把日期设置为当月第一天 
        lastDate.roll(Calendar.DATE, -1);// 日期回滚一天,也就是本月最后一天 
        str = sdf.format(lastDate.getTime());
        return str;
    }

    /** * 获得下个月第一天的日期 * * @return */
    public String getNextMonthFirst() {
        String str = "";
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

        Calendar lastDate = Calendar.getInstance();
        lastDate.add(Calendar.MONTH, 1);// 减一个月 
        lastDate.set(Calendar.DATE, 1);// 把日期设置为当月第一天 
        str = sdf.format(lastDate.getTime());
        return str;
    }

    /** * 获得下个月最后一天的日期 * * @return */
    public String getNextMonthEnd() {
        String str = "";
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

        Calendar lastDate = Calendar.getInstance();
        lastDate.add(Calendar.MONTH, 1);// 加一个月 
        lastDate.set(Calendar.DATE, 1);// 把日期设置为当月第一天 
        lastDate.roll(Calendar.DATE, -1);// 日期回滚一天,也就是本月最后一天 
        str = sdf.format(lastDate.getTime());
        return str;
    }

    /** * 获得明年最后一天的日期 * * @return */
    public String getNextYearEnd() {
        String str = "";
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

        Calendar lastDate = Calendar.getInstance();
        lastDate.add(Calendar.YEAR, 1);// 加一个年 
        lastDate.set(Calendar.DAY_OF_YEAR, 1);
        lastDate.roll(Calendar.DAY_OF_YEAR, -1);
        str = sdf.format(lastDate.getTime());
        return str;
    }

    /** * 获得明年第一天的日期 * * @return */
    public String getNextYearFirst() {
        String str = "";
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

        Calendar lastDate = Calendar.getInstance();
        lastDate.add(Calendar.YEAR, 1);// 加一个年 
        lastDate.set(Calendar.DAY_OF_YEAR, 1);
        str = sdf.format(lastDate.getTime());
        return str;

    }

    /** * 获得本年有多少天 * * @return */
    private int getMaxYear() {
        Calendar cd = Calendar.getInstance();
        cd.set(Calendar.DAY_OF_YEAR, 1);// 把日期设为当年第一天 
        cd.roll(Calendar.DAY_OF_YEAR, -1);// 把日期回滚一天。 
        int MaxYear = cd.get(Calendar.DAY_OF_YEAR);
        return MaxYear;
    }

    private int getYearPlus() {
        Calendar cd = Calendar.getInstance();
        int yearOfNumber = cd.get(Calendar.DAY_OF_YEAR);// 获得当天是一年中的第几天 
        cd.set(Calendar.DAY_OF_YEAR, 1);// 把日期设为当年第一天 
        cd.roll(Calendar.DAY_OF_YEAR, -1);// 把日期回滚一天。 
        int MaxYear = cd.get(Calendar.DAY_OF_YEAR);
        if (yearOfNumber == 1) {
            return -MaxYear;
        } else {
            return 1 - yearOfNumber;
        }
    }

    /** * 获得本年第一天的日期 * * @return */
    public String getCurrentYearFirst() {
        int yearPlus = this.getYearPlus();
        GregorianCalendar currentDate = new GregorianCalendar();
        currentDate.add(GregorianCalendar.DATE, yearPlus);
        Date yearDay = currentDate.getTime();
        DateFormat df = DateFormat.getDateInstance();
        String preYearDay = df.format(yearDay);
        return preYearDay;
    }

    // 获得本年最后一天的日期 * 
    public String getCurrentYearEnd() {
        Date date = new Date();
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy");// 可以方便地修改日期格式 
        String years = dateFormat.format(date);
        return years + "-12-31";
    }

    // 获得上年第一天的日期 * 
    public String getPreviousYearFirst() {
        Date date = new Date();
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy");// 可以方便地修改日期格式 
        String years = dateFormat.format(date);
        int years_value = Integer.parseInt(years);
        years_value--;
        return years_value + "-1-1";
    }

    // 获得上年最后一天的日期 
    public String getPreviousYearEnd() {
        weeks--;
        int yearPlus = this.getYearPlus();
        GregorianCalendar currentDate = new GregorianCalendar();
        currentDate.add(GregorianCalendar.DATE, yearPlus + MaxYear * weeks
                + (MaxYear - 1));
        Date yearDay = currentDate.getTime();
        DateFormat df = DateFormat.getDateInstance();
        String preYearDay = df.format(yearDay);
        return preYearDay;
    }

    /** * 获得本季度第一天 * * @param month * @return */
    public String getThisSeasonFirstTime(int month) {
        int array[][] = { { 1, 2, 3 }, { 4, 5, 6 }, { 7, 8, 9 }, { 10, 11, 12 } };
        int season = 1;
        if (month >= 1 && month <= 3) {
            season = 1;
        }
        if (month >= 4 && month <= 6) {
            season = 2;
        }
        if (month >= 7 && month <= 9) {
            season = 3;
        }
        if (month >= 10 && month <= 12) {
            season = 4;
        }
        int start_month = array[season - 1][0];
        int end_month = array[season - 1][2];

        Date date = new Date();
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy");// 可以方便地修改日期格式 
        String years = dateFormat.format(date);
        int years_value = Integer.parseInt(years);

        int start_days = 1;// years+"-"+String.valueOf(start_month)+"-1";//getLastDayOfMonth(years_value,start_month); 
        int end_days = getLastDayOfMonth(years_value, end_month);
        String seasonDate = years_value + "-" + start_month + "-" + start_days;
        return seasonDate;

    }

    /** * 获得本季度最后一天 * * @param month * @return */
    public String getThisSeasonFinallyTime(int month) {
        int array[][] = { { 1, 2, 3 }, { 4, 5, 6 }, { 7, 8, 9 }, { 10, 11, 12 } };
        int season = 1;
        if (month >= 1 && month <= 3) {
            season = 1;
        }
        if (month >= 4 && month <= 6) {
            season = 2;
        }
        if (month >= 7 && month <= 9) {
            season = 3;
        }
        if (month >= 10 && month <= 12) {
            season = 4;
        }
        int start_month = array[season - 1][0];
        int end_month = array[season - 1][2];

        Date date = new Date();
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy");// 可以方便地修改日期格式 
        String years = dateFormat.format(date);
        int years_value = Integer.parseInt(years);

        int start_days = 1;// years+"-"+String.valueOf(start_month)+"-1";//getLastDayOfMonth(years_value,start_month); 
        int end_days = getLastDayOfMonth(years_value, end_month);
        String seasonDate = years_value + "-" + end_month + "-" + end_days;
        return seasonDate;

    }

    /** * 获取某年某月的最后一天 * * @param year * 年 * @param month * 月 * @return 最后一天 */
    private int getLastDayOfMonth(int year, int month) {
        if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8
                || month == 10 || month == 12) {
            return 31;
        }
        if (month == 4 || month == 6 || month == 9 || month == 11) {
            return 30;
        }
        if (month == 2) {
            if (isLeapYear(year)) {
                return 29;
            } else {
                return 28;
            }
        }
        return 0;
    }

    /** * 是否闰年 * * @param year * 年 * @return */
    public boolean isLeapYear(int year) {
        return (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0);
    }

    /** * 是否闰年 * * @param year * @return */
    public boolean isLeapYear2(int year) {
        return new GregorianCalendar().isLeapYear(year);
    }
} 

详细的参考
获取时间https://blog.csdn.net/whzhaochao/article/details/40186805
Calendar工具类https://blog.csdn.net/hmily7532361/article/details/18369591
Calendar使用教程https://www.jianshu.com/p/6ef54da8932e

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