Java 输入一个字符串格式日期，获取对应的自然月开始结束时间，对应的自然年开始结束时间

冷不防 2023-07-18 02:16 10阅读 0赞

import java.text.ParseException;
    import java.text.SimpleDateFormat;
    import java.util.*;
    
    /**
     * @Author : JCccc
     * @CreateTime : 2020/3/27
     * @Description :
     **/
    public class DateTimeUtil {
    
    
        //输入一个时间,获取对应的自然月开始时间 和结束时间
        public static Map getMonthStartTimeByDate(String dateTime) throws ParseException {
            SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");
            Date date = simpleDateFormat.parse(dateTime);
            long currentTime = date.getTime();
            String timeZone = "GMT+8:00";
            Calendar calendar = Calendar.getInstance();// 获取当前日期
            calendar.setTimeZone(TimeZone.getTimeZone(timeZone));
            calendar.setTimeInMillis(currentTime);
            calendar.add(Calendar.YEAR, 0);
            calendar.add(Calendar.MONTH, 0);
            calendar.set(Calendar.DAY_OF_MONTH, 1);// 设置为1号,当前日期既为本月第一天
            calendar.set(Calendar.HOUR_OF_DAY, 0);
            calendar.set(Calendar.MINUTE, 0);
            calendar.set(Calendar.SECOND, 0);
            calendar.set(Calendar.MILLISECOND, 0);
            long timeInMillis = calendar.getTimeInMillis();
            Date resultStartDate = new Date(timeInMillis);
            String resultStartTime = simpleDateFormat.format(resultStartDate);
    
            Calendar calendar2 = Calendar.getInstance();// 获取当前日期
            calendar2.setTimeZone(TimeZone.getTimeZone(timeZone));
            calendar2.setTimeInMillis(currentTime);
            calendar2.add(Calendar.YEAR, 0);
            calendar2.add(Calendar.MONTH, 0);
            calendar2.set(Calendar.DAY_OF_MONTH, calendar.getActualMaximum(Calendar.DAY_OF_MONTH));// 获取当前月最后一天
            calendar2.set(Calendar.HOUR_OF_DAY, 23);
            calendar2.set(Calendar.MINUTE, 59);
            calendar2.set(Calendar.SECOND, 59);
            calendar2.set(Calendar.MILLISECOND, 999);
            long timeInMillis2 = calendar2.getTimeInMillis();
            Date resultEndDate = new Date(timeInMillis2);
            String resultEndTime = simpleDateFormat.format(resultEndDate);
    
            Map map = new HashMap();
            map.put("startDate", resultStartTime);
            map.put("endDate", resultEndTime);
    
            return map;
        }
    
    
        //输入一个时间,获取对应的自然年开始时间,结束时间
        public static Map getYearStartTimeByDate(String dateTime) throws ParseException {
            SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");
            Date date = simpleDateFormat.parse(dateTime);
            GregorianCalendar gc = (GregorianCalendar) Calendar.getInstance();
            gc.setTime(date);
            Calendar cal = Calendar.getInstance();
            cal.set(Calendar.YEAR, Integer.valueOf(gc.get(1)));
            cal.set(Calendar.MONTH, Calendar.JANUARY);
            cal.set(Calendar.DATE, 1);
            Long dayStartTime = getDayStartTime(cal.getTime());
            Date resultStartDate = new Date(dayStartTime);
            String resultStartTime = simpleDateFormat.format(resultStartDate);
    
            Calendar cal2 = Calendar.getInstance();
            cal2.set(Calendar.YEAR, Integer.valueOf(gc.get(1)));
            cal2.set(Calendar.MONTH, Calendar.DECEMBER);
            cal2.set(Calendar.DATE, 31);
            Long dayEndTime = getDayStartTime(cal2.getTime());
            Date resultEndDate = new Date(dayEndTime);
            String resultEndTime = simpleDateFormat.format(resultEndDate);
            Map map = new HashMap();
            map.put("startDate", resultStartTime);
            map.put("endDate", resultEndTime);
            return map;
    
    
        }
    
    
        public static Long getDayStartTime(Date d) {
    
            Calendar calendar = Calendar.getInstance();
    
            if (null != d) calendar.setTime(d);
    
            calendar.set(calendar.get(Calendar.YEAR),
                    calendar.get(Calendar.MONTH),
                    calendar.get(Calendar.DAY_OF_MONTH), 0, 0, 0);
    
            calendar.set(Calendar.MILLISECOND, 0);
    
            return calendar.getTimeInMillis();
    
        }
    
        public static void main(String[] args) throws Exception {
    
            Map monthStartTimeByDate = getMonthStartTimeByDate("2020-03-24");
            System.out.println(monthStartTimeByDate.toString());
    
    
            Map yearStartTimeByDate = getYearStartTimeByDate("2020-03-24");
            System.out.println(yearStartTimeByDate.toString());
        }
    
    
    }

测试效果：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Mzg3OTQw_size_16_color_FFFFFF_t_70][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Mzg3OTQw_size_16_color_FFFFFF_t_70]: /images/20230528/7370ea1947da4644a522fb68e4d4c373.png