Calendar类获取本天、本周、本月、本季度、半年度、本年度的起始时间

很多时候别人对你好，并不是因为别人喜欢你，而是因为他们喜欢对人好。

Calendar类获取本天、本周、本月、本季度、半年度、本年度的起始时间

构建TimeUtils工具类

public class TimeUtils {
 /**
     * 获取 当前年、半年、季度、月、日、小时 开始结束时间
     */
    private final static SimpleDateFormat shortSdf = new SimpleDateFormat("yyyy-MM-dd");
    private final static SimpleDateFormat longHourSdf = new SimpleDateFormat("yyyy-MM-dd HH");
    private final static SimpleDateFormat longSdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    /**
     * 获得本周的第一天，周一
     * @return
     */
    public static Date getCurrentWeekDayStartTime() {
        Calendar c = Calendar.getInstance();
        try {
            int weekday = c.get(Calendar.DAY_OF_WEEK) - 2;
            c.add(Calendar.DATE, -weekday);
            c.setTime(longSdf.parse(shortSdf.format(c.getTime()) + " 00:00:00"));
        } catch (Exception e) {
            e.printStackTrace();
        }
        return c.getTime();
    }
    /**
     * 获得本周的最后一天，周日
     * @return
     */
    public static Date getCurrentWeekDayEndTime() {
        Calendar c = Calendar.getInstance();
        try {
            int weekday = c.get(Calendar.DAY_OF_WEEK);
            c.add(Calendar.DATE, 8 - weekday);
            c.setTime(longSdf.parse(shortSdf.format(c.getTime()) + " 23:59:59"));
        } catch (Exception e) {
            e.printStackTrace();
        }
        return c.getTime();
    }
    /**
     * 获得上周的第一天，周一
     * @return
     */
    public static Date getLastWeekDayStartTime() {
        Calendar c = Calendar.getInstance();
        try {
            int weekday = c.get(Calendar.DAY_OF_WEEK) - 2;
            c.add(Calendar.DATE, -weekday-7);
            c.setTime(longSdf.parse(shortSdf.format(c.getTime()) + " 00:00:00"));
        } catch (Exception e) {
            e.printStackTrace();
        }
        return c.getTime();
    }
    /**
     * 获得上周的最后一天，周日
     * @return
     */
    public static Date getLastWeekDayEndTime() {
        Calendar c = Calendar.getInstance();
        try {
            int weekday = c.get(Calendar.DAY_OF_WEEK);
            c.add(Calendar.DATE, 1 - weekday);
            c.setTime(longSdf.parse(shortSdf.format(c.getTime()) + " 23:59:59"));
        } catch (Exception e) {
            e.printStackTrace();
        }
        return c.getTime();
    }
    /**
     * 获得本天的开始时间
     * @return
     */
    public static Date getCurrentDayStartTime() {
        Date now = new Date();
        try {
            now = shortSdf.parse(shortSdf.format(now));
        } catch (Exception e) {
            e.printStackTrace();
        }
        return now;
    }
    /**
     * 获得本天的结束时间
     * @return
     */
    public static Date getCurrentDayEndTime() {
        Date now = new Date();
        try {
            now = longSdf.parse(shortSdf.format(now) + " 23:59:59");
        } catch (Exception e) {
            e.printStackTrace();
        }
        return now;
    }
    /**
     * 获得昨日的开始时间
     * @return
     */
    public static Date getYesterdayStartTime() {
     Calendar c=Calendar.getInstance();
        Date now = new Date();
        c.setTime(now);
        c.add(Calendar.DATE, -1);
        Date yesterdayStart = null;
        try {
            yesterdayStart = shortSdf.parse(shortSdf.format(c.getTime()));
        } catch (Exception e) {
            e.printStackTrace();
        }
        return yesterdayStart;
    }
    /**
     * 获得昨天的结束时间
     * @return
     */
    public static Date getYesterdayEndTime() {
     Calendar c=Calendar.getInstance();
        Date now = new Date();
        c.setTime(now);
        c.add(Calendar.DATE, -1);
        Date yesterdayEnd = null;
        try {
         yesterdayEnd = longSdf.parse(shortSdf.format(c.getTime()) + " 23:59:59");
        } catch (Exception e) {
            e.printStackTrace();
        }
        return yesterdayEnd;
    }
    /**
     * 获得本小时的开始时间
     * @return
     */
    public static Date getCurrentHourStartTime() {
        Date now = new Date();
        try {
            now = longHourSdf.parse(longHourSdf.format(now));
        } catch (Exception e) {
            e.printStackTrace();
        }
        return now;
    }
    /**
     * 获得本小时的结束时间
     * @return
     */
    public static Date getCurrentHourEndTime() {
        Date now = new Date();
        try {
            now = longSdf.parse(longHourSdf.format(now) + ":59:59");
        } catch (Exception e) {
            e.printStackTrace();
        }
        return now;
    }
    /**
     * 获得本月的开始时间
     * @return
     */
    public static Date getCurrentMonthStartTime() {
        Calendar c = Calendar.getInstance();
        Date now = null;
        try {
            c.set(Calendar.DATE, 1);
            now = shortSdf.parse(shortSdf.format(c.getTime()));
        } catch (Exception e) {
            e.printStackTrace();
        }
        return now;
    }
    /**
     * 本月的结束时间
     * @return
     */
    public static Date getCurrentMonthEndTime() {
        Calendar c = Calendar.getInstance();
        Date now = null;
        try {
            c.set(Calendar.DATE, 1);
            c.add(Calendar.MONTH, 1);
            c.add(Calendar.DATE, -1);
            now = longSdf.parse(shortSdf.format(c.getTime()) + " 23:59:59");
        } catch (Exception e) {
            e.printStackTrace();
        }
        return now;
    }
    /**
     * 获得上月的开始时间
     * @return
     */
    public static Date getLastMonthStartTime() {
        Calendar c = Calendar.getInstance();
        Date now = null;
        try {
         int month=c.get(Calendar.MONTH);
         c.set(Calendar.MONTH, month-1);
            c.set(Calendar.DATE, 1);
            now = shortSdf.parse(shortSdf.format(c.getTime()));
        } catch (Exception e) {
            e.printStackTrace();
        }
        return now;
    }
    /**
     * 上月的结束时间
     * @return
     */
    public static Date getLastMonthEndTime() {
        Calendar c = Calendar.getInstance();
        Date now = null;
        try {
            c.set(Calendar.DATE, 1);
            c.add(Calendar.DATE, -1);
            now = longSdf.parse(shortSdf.format(c.getTime()) + " 23:59:59");
        } catch (Exception e) {
            e.printStackTrace();
        }
        return now;
    }
    /**
     * 当前年的开始时间
     * @return
     */
    public static Date getCurrentYearStartTime() {
        Calendar c = Calendar.getInstance();
        Date now = null;
        try {
            c.set(Calendar.MONTH, 0);
            c.set(Calendar.DATE, 1);
            now = shortSdf.parse(shortSdf.format(c.getTime()));
        } catch (Exception e) {
            e.printStackTrace();
        }
        return now;
    }
    /**
     * 当前年的结束时间
     * @return
     */
    public static Date getCurrentYearEndTime() {
        Calendar c = Calendar.getInstance();
        Date now = null;
        try {
            c.set(Calendar.MONTH, 11);
            c.set(Calendar.DATE, 31);
            now = longSdf.parse(shortSdf.format(c.getTime()) + " 23:59:59");
        } catch (Exception e) {
            e.printStackTrace();
        }
        return now;
    }
    /**
     * 当前季度的开始时间
     * @return
     */
    public static Date getCurrentQuarterStartTime() {
        Calendar c = Calendar.getInstance();
        int currentMonth = c.get(Calendar.MONTH) + 1;
        Date now = null;
        try {
            if (currentMonth >= 1 && currentMonth <= 3)
                c.set(Calendar.MONTH, 0);
            else if (currentMonth >= 4 && currentMonth <= 6)
                c.set(Calendar.MONTH, 3);
            else if (currentMonth >= 7 && currentMonth <= 9)
                c.set(Calendar.MONTH, 4);
            else if (currentMonth >= 10 && currentMonth <= 12)
                c.set(Calendar.MONTH, 9);
             c.set(Calendar.DATE, 1);
             now = longSdf.parse(shortSdf.format(c.getTime()) + " 00:00:00");
        } catch (Exception e) {
            e.printStackTrace();
        }
        return now;
    }
    /**
     * 当前季度的结束时间
     * @return
     */
    public static Date getCurrentQuarterEndTime() {
        Calendar c = Calendar.getInstance();
        int currentMonth = c.get(Calendar.MONTH) + 1;
        Date now = null;
        try {
            if (currentMonth >= 1 && currentMonth <= 3) {
                c.set(Calendar.MONTH, 2);
                c.set(Calendar.DATE, 31);
            } else if (currentMonth >= 4 && currentMonth <= 6) {
                c.set(Calendar.MONTH, 5);
                c.set(Calendar.DATE, 30);
            } else if (currentMonth >= 7 && currentMonth <= 9) {
                c.set(Calendar.MONTH, 8);
                c.set(Calendar.DATE, 30);
            } else if (currentMonth >= 10 && currentMonth <= 12) {
                c.set(Calendar.MONTH, 11);
                c.set(Calendar.DATE, 31);
            }
            now = longSdf.parse(shortSdf.format(c.getTime()) + " 23:59:59");
        } catch (Exception e) {
            e.printStackTrace();
        }
        return now;
    }
     /**
     * 上一季度的开始时间
     * @return
     */
    public static Date getLastQuarterStartTime() {
        Calendar c = Calendar.getInstance();
        int currentMonth = c.get(Calendar.MONTH) + 1;
        Date now = null;
        try {
            if (currentMonth >= 1 && currentMonth <= 3)
                c.set(Calendar.MONTH, 9);
            else if (currentMonth >= 4 && currentMonth <= 6)
                c.set(Calendar.MONTH, 0);
            else if (currentMonth >= 7 && currentMonth <= 9)
                c.set(Calendar.MONTH, 3);
            else if (currentMonth >= 10 && currentMonth <= 12)
                c.set(Calendar.MONTH, 6);
             c.set(Calendar.DATE, 1);
             now = longSdf.parse(shortSdf.format(c.getTime()) + " 00:00:00");
        } catch (Exception e) {
            e.printStackTrace();
        }
        return now;
    }
    /**
     * 上一季度的结束时间
     * @return
     */
    public static Date getLastQuarterEndTime() {
        Calendar c = Calendar.getInstance();
        int currentMonth = c.get(Calendar.MONTH) + 1;
        Date now = null;
        try {
            if (currentMonth >= 1 && currentMonth <= 3) {
                c.set(Calendar.MONTH, 11);
                c.set(Calendar.DATE, 31);
            } else if (currentMonth >= 4 && currentMonth <= 6) {
                c.set(Calendar.MONTH, 2);
                c.set(Calendar.DATE, 31);
            } else if (currentMonth >= 7 && currentMonth <= 9) {
                c.set(Calendar.MONTH, 5);
                c.set(Calendar.DATE, 30);
            } else if (currentMonth >= 10 && currentMonth <= 12) {
                c.set(Calendar.MONTH, 8);
                c.set(Calendar.DATE, 30);
            }
            now = longSdf.parse(shortSdf.format(c.getTime()) + " 23:59:59");
        } catch (Exception e) {
            e.printStackTrace();
        }
        return now;
    }
    /**
     * 获取前/后半年的开始时间
     * @return
     */
    public static Date getHalfYearStartTime() {
        Calendar c = Calendar.getInstance();
        int currentMonth = c.get(Calendar.MONTH) + 1;
        Date now = null;
        try {
            if (currentMonth >= 1 && currentMonth <= 6) {
                c.set(Calendar.MONTH, 0);
            } else if (currentMonth >= 7 && currentMonth <= 12) {
                c.set(Calendar.MONTH, 6);
            }
            c.set(Calendar.DATE, 1);
            now = longSdf.parse(shortSdf.format(c.getTime()) + " 00:00:00");
        } catch (Exception e) {
            e.printStackTrace();
        }
        return now;
    }
    /**
     * 获取前/后半年的结束时间
     * @return
     */
    public static Date getHalfYearEndTime() {
        Calendar c = Calendar.getInstance();
        int currentMonth = c.get(Calendar.MONTH) + 1;
        Date now = null;
        try {
            if (currentMonth >= 1 && currentMonth <= 6) {
                c.set(Calendar.MONTH, 5);
                c.set(Calendar.DATE, 30);
            } else if (currentMonth >= 7 && currentMonth <= 12) {
                c.set(Calendar.MONTH, 11);
                c.set(Calendar.DATE, 31);
            }
            now = longSdf.parse(shortSdf.format(c.getTime()) + " 23:59:59");
        } catch (Exception e) {
            e.printStackTrace();
        }
        return now;
    }
    /**
     * 获得一分钟后的时间
     * @param date
     * @param seconds
     * @return
     */
    public static Date addSeconds(Date date, int seconds) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.add(Calendar.SECOND, seconds);
        return calendar.getTime();
    } 
    /**
     * 查询当前时间 - 本季度
     * @param date
     * @return
     */
   public static String assPeriodQuarter(Date date){
    Calendar c=Calendar.getInstance();
    c.setTime(date);
    int month=c.get(c.MONTH);
    if(month >= 0 && month <= 2){
     return "1-3";
    }
    if(month >= 3 && month <= 5){
     return "4-6";
    }
    if(month >= 6 && month <= 8){
     return "7-9";
    }
    if(month >= 9 && month <= 11){
     return "10-12";
    }
    return null;
   }  
   /**
    * 查询当前时间 - 半年度
    * @param date
    * @return
    */
   public static String assPeriodHalfYear(Date date){
    Calendar c=Calendar.getInstance();
    c.setTime(date);
    int month=c.get(c.MONTH);
    if(month >= 0 && month <= 5){
     return "1-6";
    }
    if(month >= 6 && month <= 11){
     return "7-12";
    }
    return null;
   }
 /**
     * 以当前时间为起点一周前时间点
     * @return
     */
    public static Date getCurrentTimeLastWeek() {
     Calendar c = Calendar.getInstance();
     Date date = new Date();
     c.setTime(date);
     c.add(Calendar.DATE, -7);
     Date yearCurrentTime=c.getTime();
  return yearCurrentTime;
    }
    /**
     * 以当前时间为起点一月前时间点
     * @return
     */
    public static Date getCurrentTimeLastMonth() {
     Calendar c = Calendar.getInstance();
     Date date = new Date();
     c.setTime(date);
     c.add(Calendar.MONTH, -1);
     Date yearCurrentTime=c.getTime();
  return yearCurrentTime;
    }
    /**
     * 以当前时间为起点半年前时间点
     * @return
     */
    public static Date getCurrentTimeLastHalfYear() {
     Calendar c = Calendar.getInstance();
     Date date = new Date();
     c.setTime(date);
     c.add(Calendar.MONTH, -6);
     Date halfYearCurrentTime=c.getTime();
  return halfYearCurrentTime;
    }
    /**
     * 以当前时间为起点一年前时间点
     * @return
     */
    public static Date getCurrentTimeLastYear() {
     Calendar c = Calendar.getInstance();
     Date date = new Date();
     c.setTime(date);
     c.add(Calendar.YEAR, -1);
     Date yearCurrentTime=c.getTime();
  return yearCurrentTime;
    }
   public static void main(String[] args) {
   	System.out.println("当前小时开始："+getCurrentHourStartTime().toString());
   	System.out.println("当前小时结束："+getCurrentHourEndTime().toString());
        System.out.println("当前天开始："+getCurrentDayStartTime().toString());
        System.out.println("当前天时结束："+getCurrentDayEndTime().toString());
        System.out.println("昨日开始："+getYesterdayStartTime().toString());
        System.out.println("昨日结束："+getYesterdayEndTime().toString());
        System.out.println("当前周开始："+getCurrentWeekDayStartTime().toString());
        System.out.println("当前周结束："+getCurrentWeekDayEndTime().toString());
        System.out.println("上周开始："+getLastWeekDayStartTime().toString());
        System.out.println("上周结束："+getLastWeekDayEndTime().toString());
        System.out.println("当前月开始："+getCurrentMonthStartTime().toString());
        System.out.println("当前月结束："+getCurrentMonthEndTime().toString());
        System.out.println("上月开始："+getLastMonthStartTime().toString());
        System.out.println("上月结束："+getLastMonthEndTime().toString());
        System.out.println("当前季度开始："+getCurrentQuarterStartTime().toString());
        System.out.println("当前季度结束："+getCurrentQuarterEndTime().toString());
        System.out.println("上季度开始："+getLastQuarterStartTime().toString());
        System.out.println("上季度结束："+getLastQuarterEndTime().toString());
        System.out.println("当前半年/后半年开始："+getHalfYearStartTime().toString());
        System.out.println("当前半年/后半年结束："+getHalfYearEndTime().toString());
        System.out.println("当前年开始："+getCurrentYearStartTime().toString());
        System.out.println("当前年结束："+getCurrentYearEndTime().toString());
        System.out.println("当前季度："+assPeriodQuarter(new Date());
        System.out.println("当前半年度："+assPeriodHalfYear(new Date());
        System.out.println("以当前时间为起点一周前时间点"+getCurrentTimeLastWeek().toString());
        System.out.println("以当前时间为起点一月前时间点"+getCurrentTimeLastMonth().toString());
        System.out.println("以当前时间为起点半年前时间点"+getCurrentTimeLastHalfYear().toString());
        System.out.println("以当前时间为起点一年前时间点"+getCurrentTimeLastYear().toString());
   }
   }

这里写的蛮好的https://blog.csdn.net/cjw1231/article/details/81541952

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