java基礎(chǔ)篇之Date類型最常用的時間計算(相當(dāng)全面)
更新時間：2023年12月11日 15:11:11 作者：pingzhuyan
這篇文章主要給大家介紹了關(guān)于java基礎(chǔ)篇之Date類型最常用的時間計算的相關(guān)資料,Java中的Date類是用來表示日期和時間的類,它提供了一些常用的方法來處理日期和時間的操作,需要的朋友可以參考下
1. 前言:
平常開發(fā)中 總會有一些時間計算, 每次都去寫 不僅代碼很冗余 也是浪費時間的
這里呢 封裝了最最常用的n中寫法
持續(xù)更新 現(xiàn)在更新到43個了, 用哪個 全局搜索 復(fù)制即可
(ps: 最好對著目錄看一下 不然不太好找)
2. 具體方法實現(xiàn)
2.1 獲取當(dāng)天的開始時間
public static Date getDayBegin() {
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);
return cal.getTime();
}2.2 獲取當(dāng)天的結(jié)束時間
public static Date getDayEnd() {
Calendar cal = new GregorianCalendar();
cal.set(Calendar.HOUR_OF_DAY, 23);
cal.set(Calendar.MINUTE, 59);
cal.set(Calendar.SECOND, 59);
return cal.getTime();
}2.3 獲取昨天的開始時間
public static Date getBeginDayOfYesterday() {
Calendar cal = new GregorianCalendar();
cal.setTime(getDayBegin());
cal.add(Calendar.DAY_OF_MONTH, -1);
return cal.getTime();
}2.4 獲取昨天的結(jié)束時間
public static Date getEndDayOfYesterDay() {
Calendar cal = new GregorianCalendar();
cal.setTime(getDayEnd());
cal.add(Calendar.DAY_OF_MONTH, -1);
return cal.getTime();
}2.5 獲取明天的開始時間
public static Date getBeginDayOfTomorrow() {
Calendar cal = new GregorianCalendar();
cal.setTime(getDayBegin());
cal.add(Calendar.DAY_OF_MONTH, 1);
return cal.getTime();
}2.6 獲取明天的結(jié)束時間
public static Date getEndDayOfTomorrow() {
Calendar cal = new GregorianCalendar();
cal.setTime(getDayEnd());
cal.add(Calendar.DAY_OF_MONTH, 1);
return cal.getTime();
}2.7 獲取本周的開始時間
public static Date getBeginDayOfWeek() {
Date date = new Date();
if (date == null) {
return null;
}
Calendar cal = Calendar.getInstance();
cal.setTime(date);
int dayofweek = cal.get(Calendar.DAY_OF_WEEK);
if (dayofweek == 1) {
dayofweek += 7;
}
cal.add(Calendar.DATE, 2 - dayofweek);
return getDayStartTime(cal.getTime());
}2.8 獲取本周的結(jié)束時間
public static Date getEndDayOfWeek() {
Calendar cal = Calendar.getInstance();
cal.setTime(getBeginDayOfWeek());
cal.add(Calendar.DAY_OF_WEEK, 6);
Date weekEndSta = cal.getTime();
return getDayEndTime(weekEndSta);
}2.9 獲取本月的開始時間
public static Date getBeginDayOfMonth() {
Calendar calendar = Calendar.getInstance();
calendar.set(getNowYear(), getNowMonth() - 1, 1);
return getDayStartTime(calendar.getTime());
}2.10 獲取本月的結(jié)束時間
public static Date getEndDayOfMonth() {
Calendar calendar = Calendar.getInstance();
calendar.set(getNowYear(), getNowMonth() - 1, 1);
int day = calendar.getActualMaximum(5);
calendar.set(getNowYear(), getNowMonth() - 1, day);
return getDayEndTime(calendar.getTime());
}2.11 獲取上個月的開始時間
public static Date getBeginDayOfLastMonth(int n) {
Date date = new Date();
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
calendar.add(calendar.MONTH, -n);
calendar.set(calendar.DAY_OF_MONTH, 1);
return getDayStartTime(calendar.getTime());
}2.12 獲取上個月的結(jié)束時間
public static Date getEndDayOfLastMonth(int n) {
Date date = new Date();
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
calendar.add(calendar.MONTH, -n);
int day = calendar.getActualMaximum(5);
calendar.set(calendar.DAY_OF_MONTH, day);
return getDayEndTime(calendar.getTime());
}2.13 獲取本年的開始時間
public static Date getBeginDayOfYear() {
Calendar cal = Calendar.getInstance();
cal.set(Calendar.YEAR, getNowYear());
cal.set(Calendar.MONTH, Calendar.JANUARY);
cal.set(Calendar.DATE, 1);
return getDayStartTime(cal.getTime());
}2.14 獲取n年前的開始時間
public static Date getBeginDayOfLastYear(int n) {
Calendar cal = Calendar.getInstance();
cal.set(Calendar.YEAR, getNowYear() - n);
cal.set(Calendar.MONTH, Calendar.JANUARY);
cal.set(Calendar.DATE, 1);
return getDayStartTime(cal.getTime());
}
2.15 獲取n年前的結(jié)束時間
public static Date getEndDayOfLastYear(int n) {
Calendar cal = Calendar.getInstance();
cal.set(Calendar.YEAR, getNowYear() - n);
cal.set(Calendar.MONTH, Calendar.DECEMBER);
cal.set(Calendar.DATE, 31);
return getDayEndTime(cal.getTime());
}2.16 獲取本年的結(jié)束時間
public static Date 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());
}2.17 獲取某個日期的開始時間
public static Timestamp 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 new Timestamp(calendar.getTimeInMillis());
}2.18 獲取某個日期的結(jié)束時間
public static Timestamp getDayEndTime(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), 23,
59, 59);
calendar.set(Calendar.MILLISECOND, 999);
return new Timestamp(calendar.getTimeInMillis());
}2.19 獲取今年是哪一年
// 獲取今年是哪一年
public static Integer getNowYear() {
Date date = new Date();
GregorianCalendar gc = (GregorianCalendar) Calendar.getInstance();
gc.setTime(date);
return gc.get(Calendar.YEAR);
}2.20 獲取本月是哪一月
public static int getNowMonth() {
Date date = new Date();
GregorianCalendar gc = (GregorianCalendar) Calendar.getInstance();
gc.setTime(date);
return gc.get(Calendar.MONTH) + 1;
}2.21 時間差值計算校驗(開始與結(jié)束時間不可為空)
public static void dateMarginCheck(Date beginDate, Date endDate) {
if (beginDate == null || endDate == null) {
throw new IllegalArgumentException("getDiffDays param is null!");
}
}
2.22 日期相減得到的天數(shù)(不足一天為1 超時為-1)
public static int getExactDiffDays(Date beginDate, Date endDate) {
dateMarginCheck(beginDate, endDate);
BigDecimal subtract = new BigDecimal(endDate.getTime()).subtract(new BigDecimal(beginDate.getTime()));
BigDecimal divide = subtract.divide(new BigDecimal(1000 * 60 * 60 * 24), RoundingMode.UP);
return divide.intValue();
}2.23 兩個日期相減得到的天數(shù)[不精確]
// 兩個日期相減得到的天數(shù)
public static int getDiffDays(Date beginDate, Date endDate) {
dateMarginCheck(beginDate, endDate);
long diff = (endDate.getTime() - beginDate.getTime() - 1000) / (1000 * 60 * 60 * 24);
return new Long(diff).intValue();
}2.24 兩個日期相減得到的小時
public static int getDiffHours(Date beginDate, Date endDate) {
dateMarginCheck(beginDate, endDate);
long diff = (endDate.getTime() - beginDate.getTime()) / (1000 * 60 * 60);
return new Long(diff).intValue();
}2.25 兩個日期相減得到的毫秒數(shù)
public static long dateDiff(Date beginDate, Date endDate) {
//開始時間或結(jié)束時間為空 返回0L 毫秒
if (beginDate == null || endDate == null) {
return 0L;
}
long date1ms = beginDate.getTime();
long date2ms = endDate.getTime();
return date2ms - date1ms;
}2.26 獲取兩個日期中的最大日期
public static Date max(Date beginDate, Date endDate) {
if (beginDate == null) {
return endDate;
}
if (endDate == null) {
return beginDate;
}
if (beginDate.after(endDate)) {
return beginDate;
}
return endDate;
}2.27 獲取兩個日期中的最小日期
public static Date min(Date beginDate, Date endDate) {
if (beginDate == null) {
return endDate;
}
if (endDate == null) {
return beginDate;
}
if (beginDate.after(endDate)) {
return endDate;
}
return beginDate;
}2.28 返回某月該季度的第一個月
public static Date getFirstSeasonDate(Date date) {
final int[] SEASON = {1, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4, 4};
Calendar cal = Calendar.getInstance();
cal.setTime(date);
int sean = SEASON[cal.get(Calendar.MONTH)];
cal.set(Calendar.MONTH, sean * 3 - 3);
return cal.getTime();
}2.29 返回某個日期下幾天的日期
public static Date getNextDay(Date date, int i) {
Calendar cal = new GregorianCalendar();
cal.setTime(date);
cal.set(Calendar.DATE, cal.get(Calendar.DATE) + i);
return cal.getTime();
}
2.30 返回某個日期前幾天的日期
public static Date getFrontDay(Date date, int i) {
Calendar cal = new GregorianCalendar();
cal.setTime(date);
cal.set(Calendar.DATE, cal.get(Calendar.DATE) - i);
return cal.getTime();
}2.31 獲取某年某月到某年某月按天的切片日期集合
public static List getTimeList(int beginYear, int beginMonth, int endYear, int endMonth, int k) {
List list = new ArrayList();
if (beginYear == endYear) {
for (int j = beginMonth; j <= endMonth; j++) {
list.add(getTimeList(beginYear, j, k));
}
} else {
{
for (int j = beginMonth; j < 12; j++) {
list.add(getTimeList(beginYear, j, k));
}
for (int i = beginYear + 1; i < endYear; i++) {
for (int j = 0; j < 12; j++) {
list.add(getTimeList(i, j, k));
}
}
for (int j = 0; j <= endMonth; j++) {
list.add(getTimeList(endYear, j, k));
}
}
}
return list;
}2.32 獲取某年某月按天切片日期集合（某個月間隔多少天的日期集合）
public static List getTimeList(int beginYear, int beginMonth, int k) {
List list = new ArrayList();
Calendar begincal = new GregorianCalendar(beginYear, beginMonth, 1);
int max = begincal.getActualMaximum(Calendar.DATE);
for (int i = 1; i < max; i = i + k) {
list.add(begincal.getTime());
begincal.add(Calendar.DATE, k);
}
begincal = new GregorianCalendar(beginYear, beginMonth, max);
list.add(begincal.getTime());
return list;
}2.33 獲取某年某月的第一天日期
public static Date getStartMonthDate(int year, int month) {
Calendar calendar = Calendar.getInstance();
calendar.set(year, month - 1, 1, 0, 0, 0);
return calendar.getTime();
}2.34 獲取某年某月的最后一天日期
public static Date getEndMonthDate(int year, int month) {
Calendar calendar = Calendar.getInstance();
calendar.set(year, month - 1, 1);
int day = calendar.getActualMaximum(5);
calendar.set(year, month - 1, day, 23, 59, 59);
return calendar.getTime();
}2.35 年月日轉(zhuǎn)化成 -> 年月日 時分秒
change( 2023-06-23 ) to ( 2023-06-23 23:59:59 )
public static Date getDateDetail(Date date) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
calendar.add(Calendar.HOUR, 23);//時
calendar.add(Calendar.MINUTE, 59);//時
calendar.add(Calendar.SECOND, 59);//秒
return calendar.getTime();
}2.36 年月日自定義轉(zhuǎn)化成 -> 年月日 時分秒
change( 2023-06-23 ) to ( 2023-06-23 ?:?:? )
public static Date getDateDetail(Date date, Integer hour, Integer minute, Integer second) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
calendar.add(Calendar.HOUR, hour);//時
calendar.add(Calendar.MINUTE, minute);//時
calendar.add(Calendar.SECOND, second);//秒
return calendar.getTime();
}2.37 date2比date1多的天數(shù)
public static int differentDays(Date date1, Date date2) {
Calendar cal1 = Calendar.getInstance();
cal1.setTime(date1);
Calendar cal2 = Calendar.getInstance();
cal2.setTime(date2);
int day1 = cal1.get(Calendar.DAY_OF_YEAR);
int day2 = cal2.get(Calendar.DAY_OF_YEAR);
int year1 = cal1.get(Calendar.YEAR);
int year2 = cal2.get(Calendar.YEAR);
if (year1 != year2) //同一年
{
int timeDistance = 0;
for (int i = year1; i < year2; i++) {
if (i % 4 == 0 && i % 100 != 0 || i % 400 == 0) //閏年
{
timeDistance += 366;
} else //不是閏年
{
timeDistance += 365;
}
}
return timeDistance + (day2 - day1);
} else { //不同年
return day2 - day1;
}
}2.38 秒數(shù)(s) 轉(zhuǎn)天時分秒 或 時分秒
public static String toDayHoursMinSec(Long time) {
long day = TimeUnit.SECONDS.toDays(time);
long hours = TimeUnit.SECONDS.toHours(time) - TimeUnit.DAYS.toHours(TimeUnit.SECONDS.toDays(time));
long minutes = TimeUnit.SECONDS.toMinutes(time) - TimeUnit.HOURS.toMinutes(TimeUnit.SECONDS.toHours(time));
long seconds = TimeUnit.SECONDS.toSeconds(time) - TimeUnit.MINUTES.toSeconds(TimeUnit.SECONDS.toMinutes(time));
if (day > 0) {
return String.format("%s天%s時%s分%s秒", day, hours, minutes, seconds);
}
return String.format("%s時%s分%s秒", hours, minutes, seconds);
}2.39 毫秒數(shù)(ms) 轉(zhuǎn)天時分秒 或 時分秒
public static String toDayHoursMinMilliSec(Long time) {
long day = TimeUnit.MILLISECONDS.toDays(time);
long hours = TimeUnit.MILLISECONDS.toHours(time) - TimeUnit.DAYS.toHours(TimeUnit.MILLISECONDS.toDays(time));
long minutes = TimeUnit.MILLISECONDS.toMinutes(time) - TimeUnit.HOURS.toMinutes(TimeUnit.MILLISECONDS.toHours(time));
long seconds = TimeUnit.MILLISECONDS.toSeconds(time) - TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(time));
if (day > 0) {
return String.format("%s天%s時%s分%s秒", day, hours, minutes, seconds);
}
return String.format("%s時%s分%s秒", hours, minutes, seconds);
}2.40 獲取當(dāng)前時間[精準(zhǔn)]
與new Date(有區(qū)別)
public static Date getNowDate() {
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.MILLISECOND, 0);
return calendar.getTime();
}2.41 時間字符串轉(zhuǎn)換date
public static Date getStrToDate(String dateStr) throws ParseException {
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
return format.parse(dateStr);
}2.42 獲取到?天后的Date類型時間
public static Date getAfterDayEnd(Date startTime, int days) {
Calendar cal = Calendar.getInstance();
cal.setTime(startTime);
cal.add(Calendar.DAY_OF_MONTH, days);//跟隨月份走的天數(shù)<構(gòu)造器中寫了每個月的天數(shù)...>
return cal.getTime();
}2.43 n小時后的時間
public static Date getAfterHourEnd(Date startTime, int hours) {
Calendar cal = Calendar.getInstance();
cal.setTime(startTime);
cal.add(Calendar.HOUR_OF_DAY, hours);//24小時制度
return cal.getTime();
}總結(jié)
到此這篇關(guān)于java基礎(chǔ)篇之Date類型最常用的時間計算的文章就介紹到這了,更多相關(guān)java Date類型時間計算內(nèi)容請搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持腳本之家！
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