JAVA 获取当天、昨天、当月、上个月 的开始和结束日期时间，springboot常见面试题

return map;

}

/**

• 获取上个月月开始时间和结束时间

• @return

*/

public static Map getLastMonthTime() throws Exception {

Long startTime = getLastMonthStartTime();

Long endTime = getLastMonthEndTime();

DateTimeFormatter ftf = DateTimeFormatter.ofPattern(“yyyy-MM-dd HH:mm:ss”);

String startTimeStr = ftf.format(LocalDateTime.ofInstant(Instant.ofEpochMilli(startTime), ZoneId.systemDefault()));

String endTimeStr = ftf.format(LocalDateTime.ofInstant(Instant.ofEpochMilli(endTime), ZoneId.systemDefault()));

Map map = new HashMap();

map.put(“startDate”, startTimeStr);

map.put(“endDate”, endTimeStr);

return map;

}

//获取月均开始和结束时间

public static Map getAverageTime(String minCreateTime) throws ParseException {

Long yesterdayTimeEnd =getEndDayOfYesterDay();

DateTimeFormatter ftf = DateTimeFormatter.ofPattern(“yyyy-MM-dd HH:mm:ss”);

//昨天的时间

String yesterdayStr = ftf.format(LocalDateTime.ofInstant(Instant.ofEpochMilli(yesterdayTimeEnd), ZoneId.systemDefault()));

SimpleDateFormat sdf = new SimpleDateFormat(“yyyy-MM-dd HH:mm:ss”);

String yesterdayBefore30Str = “”;

Calendar calc = Calendar.getInstance();

calc.setTime(sdf.parse(yesterdayStr));

calc.add(calc.DATE, -30);

calc.set(Calendar.HOUR_OF_DAY, 0);

calc.set(Calendar.MINUTE, 0);

calc.set(Calendar.SECOND, 0);

calc.set(Calendar.MILLISECOND, 0);

Date minDate = calc.getTime();

yesterdayBefore30Str = sdf.format(minDate);

int num = daysBetween(yesterdayBefore30Str, yesterdayStr);

int checkNum = daysBetween(minCreateTime, yesterdayBefore30Str);

System.out.println(“checkNum:”+checkNum);

Map map = new HashMap();

if (checkNum < 0) {

int numNew = daysBetween(minCreateTime, yesterdayStr);

map.put(“startDate”, minCreateTime);

map.put(“endDate”, yesterdayStr);

map.put(“num”, Math.abs(numNew)); //取绝对值

return map;

}

map.put(“startDate”, yesterdayBefore30Str);

map.put(“endDate”, yesterdayStr);

map.put(“num”, num);

return map;

}

public static int daysBetween(String smdate, String bdate) throws ParseException {

SimpleDateFormat sdf = new SimpleDateFormat(“yyyy-MM-dd”);

Calendar cal = Calendar.getInstance();

cal.setTime(sdf.parse(smdate));

long time1 = cal.getTimeInMillis();

cal.setTime(sdf.parse(bdate));

long time2 = cal.getTimeInMillis();

long between_days = (time2 - time1) / (1000 * 3600 * 24);

return Integer.parseInt(String.valueOf(between_days));

}

/**

• 获取今天开始时间

*/

private static Long getStartTime() {

Calendar todayStart = Calendar.getInstance();

todayStart.set(Calendar.HOUR_OF_DAY, 0);

todayStart.set(Calendar.MINUTE, 0);

todayStart.set(Calendar.SECOND, 0);

todayStart.set(Calendar.MILLISECOND, 0);

return todayStart.getTimeInMillis();

}

/**

• 获取今天结束时间

*/

private static Long getEndTime() {

Calendar todayEnd = Calendar.getInstance();

todayEnd.set(Calendar.HOUR, 23);

todayEnd.set(Calendar.MINUTE, 59);

todayEnd.set(Calendar.SECOND, 59);

todayEnd.set(Calendar.MILLISECOND, 999);

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return todayEnd.getTime().getTime();

}

/**

• 获取当月开始时间

*/

public static Long getMonthStartTime() {

Long currentTime = System.currentTimeMillis();

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);

return calendar.getTimeInMillis();

}

/**

• 获取当月的结束时间戳

*/

public static Long getMonthEndTime() {

Long currentTime = System.currentTimeMillis();

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, calendar.getActualMaximum(Calendar.DAY_OF_MONTH));// 获取当前月最后一天

calendar.set(Calendar.HOUR_OF_DAY, 23);

calendar.set(Calendar.MINUTE, 59);

calendar.set(Calendar.SECOND, 59);

calendar.set(Calendar.MILLISECOND, 999);

return calendar.getTimeInMillis();

}

public static Long getLastMonthStartTime() throws Exception {

Long currentTime = System.currentTimeMillis();

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, -1);

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);

return calendar.getTimeInMillis();

}

public static Long getLastMonthEndTime() {

Long currentTime = System.currentTimeMillis();

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, -1);

calendar.set(Calendar.DAY_OF_MONTH, calendar.getActualMaximum(Calendar.DAY_OF_MONTH));// 获取当前月最后一天

calendar.set(Calendar.HOUR_OF_DAY, 23);

calendar.set(Calendar.MINUTE, 59);

calendar.set(Calendar.SECOND, 59);

calendar.set(Calendar.MILLISECOND, 999);

return calendar.getTimeInMillis();

}

public static Long getBeginDayOfYesterday() {

Calendar cal = new GregorianCalendar();

cal.set(Calendar.HOUR_OF_DAY, 0);

cal.set(Calendar.MINUTE, 0);

cal.set(Calendar.SECOND, 0);

cal.set(Calendar.MILLISECOND, 0);

cal.add(Calendar.DAY_OF_MONTH, -1);

return cal.getTimeInMillis();

}

public static Long getEndDayOfYesterDay() {

Calendar cal = new GregorianCalendar();

cal.set(Calendar.HOUR_OF_DAY, 23);

cal.set(Calendar.MINUTE, 59);

cal.set(Calendar.SECOND, 59);

cal.add(Calendar.DAY_OF_MONTH, -1);

return cal.getTimeInMillis();

}

//获取今年是哪一年

public static Integer getNowYear() {

Date date = new Date();

GregorianCalendar gc = (GregorianCalendar) Calendar.getInstance();

gc.setTime(date);

return Integer.valueOf(gc.get(1));

}

public static Map getThisYearTime() throws Exception {

Long startTime = getBeginDayOfYear();

Long endTime = getEndDayOfYear();

DateTimeFormatter ftf = DateTimeFormatter.ofPattern(“yyyy-MM-dd”);

String startTimeStr = ftf.format(LocalDateTime.ofInstant(Instant.ofEpochMilli(startTime), ZoneId.systemDefault()));

String endTimeStr = ftf.format(LocalDateTime.ofInstant(Instant.ofEpochMilli(endTime), ZoneId.systemDefault()));

Map map = new HashMap();

map.put(“startDate”, startTimeStr);

map.put(“endDate”, endTimeStr);

return map;

}

//获取本年的开始时间

public static Long getBeginDayOfYear() {

Calendar cal = Calendar.getInstance();

cal.set(Calendar.YEAR, getNowYear());

// cal.set

cal.set(Calendar.MONTH, Calendar.JANUARY);

cal.set(Calendar.DATE, 1);

return getDayStartTime(cal.getTime());

}

//获取本年的结束时间

public static Long getEndDayOfYear() {

Calendar cal = Calendar.getInstance();

cal.set(Calendar.YEAR, getNowYear());

cal.set(Calendar.MONTH, Calendar.DECEMBER);

cal.set(Calendar.DATE, 31);

return getDayEndTime(cal.getTime());

}

//获取某个日期的开始时间

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();

}

//获取某个日期的结束时间