1、返回指定月份的总天数(当前年) eg：10-->31
public static int countDaysInMonth(int month) {
return LocalDate.now().withMonth(month).lengthOfMonth();
}
2、获取指定月份的当前日期的天数 eg：2017/10/10-->10
public static int countNowDaysInMonth(int month) {
return LocalDate.now().withMonth(month).now().getDayOfMonth();
}
3、根据年、月获取对应的月份的天数(获取指定年指定月的总天数)eg：2017/10/-->31
public static int getDaysByYearMonth(int year, int month) {
Calendar a = Calendar.getInstance();
a.set(Calendar.YEAR, year);
a.set(Calendar.MONTH, month - 1);
a.set(Calendar.DATE, 1);
a.roll(Calendar.DATE, -1);
int maxDate = a.get(Calendar.DATE);
return maxDate;
}
package com.cmy.utils;
import java.sql.Time;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.time.LocalDate;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.LinkedList;
import java.util.List;
import java.util.Locale;
import java.util.TimeZone;
public class DateUtil {
public static final String yyyy_MM_dd = "yyyy-MM-dd";
public static final String yyyy_MM_dd_HHmmss = "yyyy-MM-dd HH:mm:ss";
public static final String yyMMddHHmmss = "yyMMddHHmmss";
public static String formatDate(Date date, String format) {
String result = "";
SimpleDateFormat sdf = new SimpleDateFormat(format);
if (date != null) {
result = sdf.format(date);
}
return result;
}
public static Date formatString(String str, String format) throws ParseException {
if (StringUtil.isEmpty(str)) {
return null;
}
SimpleDateFormat sdf = new SimpleDateFormat(format);
return sdf.parse(str);
}
public static Date parseString(String str, String format) {
if (StringUtil.isEmpty(str)) {
return null;
}
Date parse = null;
try {
SimpleDateFormat sdf = new SimpleDateFormat(format);
parse = sdf.parse(str);
} catch (ParseException e) {
e.printStackTrace();
}
return parse;
}
public static Calendar getTodayBegin() {
Calendar now = Calendar.getInstance();
now.set(Calendar.HOUR_OF_DAY, 0);
now.set(Calendar.MINUTE, 0);
now.set(Calendar.SECOND, 0);
return now;
}
public static Calendar getTomorrowBegin() {
Calendar now = Calendar.getInstance();
now.add(Calendar.DAY_OF_YEAR, 1);
now.set(Calendar.HOUR_OF_DAY, 0);
now.set(Calendar.MINUTE, 0);
now.set(Calendar.SECOND, 0);
return now;
}
public static Calendar after(int hour) {
Calendar now = Calendar.getInstance();
now.set(Calendar.HOUR_OF_DAY, now.get(Calendar.DATE) - hour);
return now;
}
/**
* 获取昨天的时间区间
*/
public static Date[] getYesterdaySpace() {
Calendar now = Calendar.getInstance();
now.set(Calendar.DATE, now.get(Calendar.DATE) - 1);
now.set(Calendar.HOUR_OF_DAY, 0);
now.set(Calendar.MINUTE, 0);
now.set(Calendar.SECOND, 0);
Date date[] = new Date[2];
date[0] = now.getTime();
now.set(Calendar.HOUR_OF_DAY, 23);
now.set(Calendar.MINUTE, 59);
now.set(Calendar.SECOND, 59);
date[1] = now.getTime();
return date;
}
/**
* 获取今天的时间区间
*/
public static Date[] getTodaySpace() {
Calendar now = Calendar.getInstance();
now.set(Calendar.HOUR_OF_DAY, 0);
now.set(Calendar.MINUTE, 0);
now.set(Calendar.SECOND, 0);
Date date[] = new Date[2];
date[0] = now.getTime();
now.set(Calendar.HOUR_OF_DAY, 23);
now.set(Calendar.MINUTE, 59);
now.set(Calendar.SECOND, 59);
date[1] = now.getTime();
return date;
}
/**
* 获取今月的时间区间
*/
public static Date[] getThisMonthSpace() {
Calendar now = Calendar.getInstance();
now.set(Calendar.DATE, 1);
now.set(Calendar.HOUR_OF_DAY, 0);
now.set(Calendar.MINUTE, 0);
now.set(Calendar.SECOND, 0);
Date date[] = new Date[2];
date[0] = now.getTime();
now.roll(Calendar.DATE, -1);
now.set(Calendar.HOUR_OF_DAY, 23);
now.set(Calendar.MINUTE, 59);
now.set(Calendar.SECOND, 59);
date[1] = now.getTime();
return date;
}
/**
* 获取上个月的时间区间
*/
public static Date[] getLastMonthSpace() {
Calendar now = Calendar.getInstance();
now.add(Calendar.MONTH, -1);
now.set(Calendar.DATE, 1);
now.set(Calendar.HOUR_OF_DAY, 0);
now.set(Calendar.MINUTE, 0);
now.set(Calendar.SECOND, 0);
Date date[] = new Date[2];
date[0] = now.getTime();
now.roll(Calendar.DATE, -1);
now.set(Calendar.HOUR_OF_DAY, 23);
now.set(Calendar.MINUTE, 59);
now.set(Calendar.SECOND, 59);
date[1] = now.getTime();
return date;
}
/**
* 获取今年的时间区间
*/
public static Date[] getThisYearSpace() {
Calendar now = Calendar.getInstance();
now.set(Calendar.MONTH, 0);
now.set(Calendar.DATE, 1);
now.set(Calendar.HOUR_OF_DAY, 0);
now.set(Calendar.MINUTE, 0);
now.set(Calendar.SECOND, 0);
Date date[] = new Date[2];
date[0] = now.getTime();
now.set(Calendar.MONTH, 11);
now.roll(Calendar.DATE, -1);
now.set(Calendar.HOUR_OF_DAY, 23);
now.set(Calendar.MINUTE, 59);
now.set(Calendar.SECOND, 59);
date[1] = now.getTime();
return date;
}
/**
* 获取去年的时间区间
*/
public static Date[] getLastYearSpace() {
Calendar now = Calendar.getInstance();
now.add(Calendar.YEAR, -1);
now.set(Calendar.MONTH, 0);
now.set(Calendar.DATE, 1);
now.set(Calendar.HOUR_OF_DAY, 0);
now.set(Calendar.MINUTE, 0);
now.set(Calendar.SECOND, 0);
Date date[] = new Date[2];
date[0] = now.getTime();
now.set(Calendar.MONTH, 11);
now.roll(Calendar.DATE, -1);
now.set(Calendar.HOUR_OF_DAY, 23);
now.set(Calendar.MINUTE, 59);
now.set(Calendar.SECOND, 59);
date[1] = now.getTime();
return date;
}
/**
* 获取当前小时的时间区间
*/
public static Date[] thisHourSpace() {
Date date[] = new Date[2];
Calendar now = Calendar.getInstance();
now.set(Calendar.MINUTE, 0);
now.set(Calendar.SECOND, 0);
date[0] = now.getTime();
now.set(Calendar.MINUTE, 59);
now.set(Calendar.SECOND, 59);
date[1] = now.getTime();
return date;
}
/**
* 获取当上一小时的时间区间
*/
public static Date[] lastHourSpace() {
Date date[] = new Date[2];
Calendar now = Calendar.getInstance();
now.add(Calendar.HOUR, -1);
now.set(Calendar.MINUTE, 0);
now.set(Calendar.SECOND, 0);
date[0] = now.getTime();
now.set(Calendar.MINUTE, 59);
now.set(Calendar.SECOND, 59);
date[1] = now.getTime();
return date;
}
public static String getCurrentDateStr() {
Date date = new Date();
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");
return sdf.format(date);
}
public static Date getDateFromTimeMillis(Long timeMillis) {
Date date = new Date(timeMillis);
return date;
}
/**
* 获取今天0点的时间戳
* @return
*/
public static Long getDayBeginTimeInMillis() {
Calendar cal = Calendar.getInstance(TimeZone.getTimeZone("GMT+8 "));
cal.set(Calendar.HOUR_OF_DAY, 0);
cal.set(Calendar.SECOND, 0);
cal.set(Calendar.MINUTE, 0);
cal.set(Calendar.MILLISECOND, 001);
return cal.getTimeInMillis();
}
/**
* 查看今天是星期几，如果今天是星期5，则返回5
* @return
*/
public static String getDayOfWeekNum() {
Date date = new Date();
String[] weeks = { "7", "1", "2", "3", "4", "5", "6" };
Calendar cal = Calendar.getInstance();
cal.setTime(date);
int week_index = cal.get(Calendar.DAY_OF_WEEK) - 1;
if (week_index < 0) {
week_index = 0;
}
return weeks[week_index];
}
/**
* 获取当前时间是 几点几分几秒
* @return
*/
public static Time getNowTime() {
Time nowTime = new Time(System.currentTimeMillis() - getDayBeginTimeInMillis());
return nowTime;
}
/**
* 毫秒转化
* @param ms
* @return
*/
public static String formatTime(long ms) {
int ss = 1000;
int mi = ss * 60;
int hh = mi * 60;
int dd = hh * 24;
long day = ms / dd;
long hour = (ms - day * dd) / hh;
long minute = (ms - day * dd - hour * hh) / mi;
long second = (ms - day * dd - hour * hh - minute * mi) / ss;
long milliSecond = ms - day * dd - hour * hh - minute * mi - second * ss;
String strDay = day < 10 ? "0" + day : "" + day; // 天
String strHour = hour < 10 ? "0" + hour : "" + hour;// 小时
String strMinute = minute < 10 ? "0" + minute : "" + minute;// 分钟
String strSecond = second < 10 ? "0" + second : "" + second;// 秒
String strMilliSecond = milliSecond < 10 ? "0" + milliSecond : "" + milliSecond;// 毫秒
strMilliSecond = milliSecond < 100 ? "0" + strMilliSecond : "" + strMilliSecond;
return strMinute + " 分钟 " + strSecond + " 秒";
}
/**
* 判断当前时分是否在某两个时分段内
* @param beginTime
* @param endTime
* @return
* @throws ParseException
*/
public static boolean inTimeSpace(Time beginTime, Time endTime) {
SimpleDateFormat sdf = new SimpleDateFormat("HH:mm");
try {
String format = sdf.format(new Date());
Date now = sdf.parse(format);
String beginTimeStr = sdf.format(beginTime);
Date begin = sdf.parse(beginTimeStr);
String endTimeStr = sdf.format(endTime);
Date end = sdf.parse(endTimeStr);
if (begin.before(now) && now.before(end)) {
return true;
}
} catch (ParseException e) {
e.printStackTrace();
}
return false;
}
/**
* 获取今天每个时刻的整点，当天0点到当天23点
* @return
*/
public static List<Date> getTodayEachHourBegin() {
List<Date> hourList1 = new ArrayList<>();
int hour1 = 23;
for (int i = 0; i <= hour1; i++) {
Calendar now = Calendar.getInstance();
now.set(Calendar.HOUR_OF_DAY, i);
now.set(Calendar.MINUTE, 0);
now.set(Calendar.SECOND, 0);
hourList1.add(now.getTime());
}
return hourList1;
}
/**
* 获取今天每个时刻的整点，当天1点到第二天0点
* @return
*/
public static List<Date> getTodayEachHourBegin2() {
List<Date> hourList1 = new ArrayList<>();
int hour1 = 24;
for (int i = 1; i <= hour1; i++) {
Calendar now = Calendar.getInstance();
now.set(Calendar.HOUR_OF_DAY, i);
now.set(Calendar.MINUTE, 0);
now.set(Calendar.SECOND, 0);
hourList1.add(now.getTime());
}
return hourList1;
}
/**
*
* @Title: countDaysInMonth
* @Description: TODO(返回指定月份的总天数)
* @param @param month 传入的月份
* @param @return 参数 指定月份的天数
* @return int 返回类型
* @throws
*/
public static int countDaysInMonth(int month) {
return LocalDate.now().withMonth(month).lengthOfMonth();
}
/**
*
* @Title: countNowDaysInMonth
* @Description: TODO(获取指定月份的当前日期的天数)
* @param @param month 当前月份的当前天数
* eg：2017/10/10-->10
* @param @return 参数
* @return int 返回类型
* @throws
*/
public static int countNowDaysInMonth(int month) {
return LocalDate.now().withMonth(month).now().getDayOfMonth();
}
/**
*
* @Title: parseDate
* @Description: TODO(返回一个具体的日期)
* eg：2017_06_31
* @param @param y 年
* @param @param m 月
* @param @param d 日
* @param @return 参数
* @return String 返回类型
* @throws
*/
public static String parseDate(int y, int m, int d) {
String date = "";
String day = "";
String month = "";
if (d <= 9) {
day = "0" + d;
} else {
day = d + "";
}
if (m <= 9) {
month = "0" + m;
} else {
month = m + "";
}
date = y + "_" + month + "_" + day;
return date;
}
/**
*
* @Title: getDaysByYearMonth
* @Description: TODO(根据 年、月 获取对应的月份 的 天数)
* @param @param year
* @param @param month
* @param @return 参数
* @return int 返回类型
* @throws
*/
public static int getDaysByYearMonth(int year, int month) {
Calendar a = Calendar.getInstance();
a.set(Calendar.YEAR, year);
a.set(Calendar.MONTH, month - 1);
a.set(Calendar.DATE, 1);
a.roll(Calendar.DATE, -1);
int maxDate = a.get(Calendar.DATE);
return maxDate;
}
/**
*
* @Title: getDayOfWeekByDate
* @Description: TODO(根据日期 找到对应日期的 星期几)
* @param @param date
* @param @return 参数
* @return String 返回类型
* @throws
*/
public static String getDayOfWeekByDate(String date) {
String dayOfweek = "-1";
try {
SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd");
Date myDate = myFormatter.parse(date);
SimpleDateFormat formatter = new SimpleDateFormat("E");
String str = formatter.format(myDate);
dayOfweek = str;
} catch (Exception e) {
System.out.println("错误!");
}
return dayOfweek;
}
/**
* 获取上周时间区间
*
* @return
*/
public static Date[] getLsatWeek() {
Calendar now = Calendar.getInstance();
now.add(Calendar.WEEK_OF_YEAR, -1);
now.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY);
Date date[] = new Date[2];
date[0] = now.getTime();
System.out.println(date[0]);
now.set(Calendar.DAY_OF_WEEK, Calendar.SATURDAY);
date[1] = now.getTime();
System.out.println(date[1]);
return date;
}
/**
* 获取本周时间区间
*
* @return
*/
public static Date[] getTimesWeekmorning() {
Calendar now = Calendar.getInstance();
now.set(Calendar.HOUR_OF_DAY, 0);
now.set(Calendar.MINUTE, 0);
now.set(Calendar.SECOND, 0);
now.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
Date date[] = new Date[2];
date[0] = now.getTime();
System.out.println(date[0]);
Date nowtime = new Date();
date[1] = nowtime;
System.out.println(date[1]);
return date;
}
/**
* 获取当上一小时的时间点
*/
public static Date lastHour() {
Calendar now = Calendar.getInstance();
now.add(Calendar.HOUR, -1);
now.set(Calendar.MINUTE, 59);
now.set(Calendar.SECOND, 59);
return now.getTime();
}
/**
* 某一年的天数
*/
public static int whichYear(String date) {
int days = 0;
if (date.equals(Calendar.getInstance().get(Calendar.YEAR))) {
days = Calendar.getInstance().get(Calendar.DAY_OF_YEAR);
} else {
SimpleDateFormat sdf = new SimpleDateFormat("", Locale.ENGLISH);
sdf.applyPattern("yyyy");
Calendar calendar = new GregorianCalendar();
try {
calendar.setTime(sdf.parse(date));
} catch (ParseException e) {
e.printStackTrace();
}
days = calendar.getActualMaximum(Calendar.DAY_OF_YEAR);
}
return days;
}
/**
* 某一月的天数
*/
public static int whichMonth(String date) {
int days = 0;
if (date.equals(
(Calendar.getInstance().get(Calendar.YEAR) + "-" + (Calendar.getInstance().get(Calendar.MONTH) + 1))
.toString())) {
days = Calendar.getInstance().get(Calendar.DAY_OF_MONTH);
} else {
SimpleDateFormat sdf = new SimpleDateFormat("", Locale.ENGLISH);
sdf.applyPattern("yyyy-MM");
Calendar calendar = new GregorianCalendar();
try {
calendar.setTime(sdf.parse(date));
} catch (ParseException e) {
e.printStackTrace();
}
days = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
}
return days;
}
/**
*
* @Title: daysBetween
* @Description: TODO(计算两个时间之的时差)
* @param @param s 起始时间 yyyy-MM-dd
* @param @param b 结束时间 yyyy-MM-dd
* @param @return
* @param @throws ParseException 参数
* @return int 返回类型
* @throws
*/
public static int daysBetween(String s, String b) throws ParseException {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Date smdate = sdf.parse(s);
Date bdate = sdf.parse(b);
smdate = sdf.parse(sdf.format(smdate));
bdate = sdf.parse(sdf.format(bdate));
Calendar cal = Calendar.getInstance();
cal.setTime(smdate);
long time1 = cal.getTimeInMillis();
cal.setTime(bdate);
long time2 = cal.getTimeInMillis();
long between_days = (time2 - time1) / (1000 * 3600 * 24);
return Integer.parseInt(String.valueOf(between_days));
}
/**
*
* @Title: getSeason
* @Description: TODO(获取当前季度)
* @param @return 参数
* @return int 返回类型
* @throws
*/
public static int getSeason() {
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.MONTH, Calendar.NOVEMBER);
int month = calendar.get(Calendar.MONTH);
int season = (month + 1 + 4) / 4;
return season;
}
/**
* （按照中国的纬度）
第一季度：3－5月（春季）
第二季度：6－8月（夏季）
第三季度：9－11月（秋季）
第四季度：12－2月（冬季）
* @Title: getMonthBySeason
* @Description: TODO(根据季度获取月份集合)
* @param @param season
* @param @return 参数
* @return List<Integer> 返回类型
* @throws
*/
public static List<Integer> getMonthBySeason(int season) {
if (season > 4) {
return null;
}
List<Integer> months = new LinkedList<Integer>();
switch (season) {
case 1:
months = Arrays.asList(3, 4, 5);
break;
case 2:
months = Arrays.asList(6, 7, 8);
break;
case 3:
months = Arrays.asList(9, 10, 11);
break;
case 4:
months = Arrays.asList(12, 1, 2);
break;
default:
break;
}
return months;
}
/**
* （按照中国的纬度）
第一季度：3－5月（春季）
第二季度：6－8月（夏季）
第三季度：9－11月（秋季）
第四季度：12－2月（冬季）
* @Title: getSeasonDate
* @Description: TODO(根据季度返回月份)
* @param @param date
* @param @return 参数
* @return Date[] 返回类型
* @throws
*/
public static Date[] getSeasonDate(Date date) {
Date[] season = new Date[3];
Calendar c = Calendar.getInstance();
c.setTime(date);
int nSeason = getSeason(date);
if (nSeason == 1) {// 第一季度
c.set(Calendar.MONTH, Calendar.MARCH);
season[0] = c.getTime();
c.set(Calendar.MONTH, Calendar.APRIL);
season[1] = c.getTime();
c.set(Calendar.MONTH, Calendar.MAY);
season[2] = c.getTime();
} else if (nSeason == 2) {// 第二季度
c.set(Calendar.MONTH, Calendar.JUNE);
season[0] = c.getTime();
c.set(Calendar.MONTH, Calendar.JULY);
season[1] = c.getTime();
c.set(Calendar.MONTH, Calendar.AUGUST);
season[2] = c.getTime();
} else if (nSeason == 3) {// 第三季度
c.set(Calendar.MONTH, Calendar.SEPTEMBER);
season[0] = c.getTime();
c.set(Calendar.MONTH, Calendar.OCTOBER);
season[1] = c.getTime();
c.set(Calendar.MONTH, Calendar.NOVEMBER);
season[2] = c.getTime();
} else if (nSeason == 4) {// 第四季度
c.set(Calendar.MONTH, Calendar.DECEMBER);
season[0] = c.getTime();
c.set(Calendar.MONTH, Calendar.JANUARY);
season[1] = c.getTime();
c.set(Calendar.MONTH, Calendar.FEBRUARY);
season[2] = c.getTime();
}
return season;
}
/**
*
* @Title: getSeason
* @Description: TODO(1 第一季度 2 第二季度 3 第三季度 4 第四季度 )
* @param @param date
* @param @return 参数
* @return int 返回类型
* @throws
*/
public static int getSeason(Date date) {
int season = 0;
Calendar c = Calendar.getInstance();
c.setTime(date);
int month = c.get(Calendar.MONTH);
switch (month) {
case Calendar.JANUARY:
case Calendar.FEBRUARY:
case Calendar.MARCH:
season = 1;
break;
case Calendar.APRIL:
case Calendar.MAY:
case Calendar.JUNE:
season = 2;
break;
case Calendar.JULY:
case Calendar.AUGUST:
case Calendar.SEPTEMBER:
season = 3;
break;
case Calendar.OCTOBER:
case Calendar.NOVEMBER:
case Calendar.DECEMBER:
season = 4;
break;
default:
break;
}
return season;
}
}