java最全最常用的日期工具类（随时补充）
导读：@Slf4j public final class DateUtils { private DateUtils( { } private static final String FORMAT_YYYYMMDDH...
@Slf4j
public final class DateUtils {
private DateUtils() {
}
private static final String FORMAT_YYYYMMDDHHMMSS = "yyyy-MM-dd HH:mm:ss";
public static final String FORMAT_YYYY_MM_DD = "yyyy-MM-dd";
public static final String FORMAT_YYMMDD = "yyyyMMdd";
/**
* 把日期格式化为yyyy-MM-dd HH:mm:ss字符串
*
* @param date
* @return
*/
public static String formatTime(Date date) {
SimpleDateFormat sdf = new SimpleDateFormat(FORMAT_YYYYMMDDHHMMSS);
return sdf.format(date);
}
/**
* 把日期格式化为pattern字符串
*
* @param date
* @param pattern
* @return
*/
public static String formatTime(Date date, String pattern) {
SimpleDateFormat sdf = new SimpleDateFormat(pattern);
return sdf.format(date);
}
/**
* 把日期字符串转换为yyyy-MM-dd HH:mm:ss或者yyyy-MM-dd格式的日期
*
* @param date
* @return
*/
public static Date tDate(String date) {
if (date == null) return null;
SimpleDateFormat sdf = null;
if (date.contains(GlobalManager.Symbol.MH)) {
sdf = new SimpleDateFormat(FORMAT_YYYYMMDDHHMMSS);
}
else {
sdf = new SimpleDateFormat(FORMAT_YYYY_MM_DD);
}
try {
return sdf.parse(date);
}
catch (ParseException e) {
}
return null;
}
/**
* 把日期字符串转换为pattern格式的日期
*
* @param date
* @param pattern
* @return
*/
public static Date tDate(String date, String pattern) {
SimpleDateFormat sdf = new SimpleDateFormat(pattern);
try {
return sdf.parse(date);
}
catch (ParseException e) {
}
return null;
}
/**
* 日期加减法
*
* @param date
* @param day
* @return
*/
public static Date addDate(Date date, int day) {
return new DateTime(date).plusDays(day).toDate();
}
/**
* 日期加减法
*
* @param day
* @return
*/
public static Date addDate(int day) {
return new DateTime(new Date()).plusDays(day).toDate();
}
/**
* 获取格式为yyyy-MM-dd当天日期字符串
*
* @return
*/
public static String getDate() {
return formatTime(new Date(), FORMAT_YYYY_MM_DD);
}
/**
* 获取格式为yyyy-MM-dd日期字符串
*
* @param date
* @return
*/
public static String getDate(Date date) {
return formatTime(date, FORMAT_YYYY_MM_DD);
}
/**
* 获取格式为yyyy-MM-dd HH:mm:ss当天日期字符串
*
* @return
*/
public static String getTime() {
return formatTime(new Date(), FORMAT_YYYYMMDDHHMMSS);
}
/**
* 获取格式为yyyy-MM-dd HH:mm:ss日期字符串
*
* @param date
* @return
*/
public static String getTime(Date date) {
return formatTime(date, FORMAT_YYYYMMDDHHMMSS);
}
/**
* 获取年份
*
* @param date
* @return
*/
public static Integer getYear(Date date) {
return Integer.valueOf(String.format("%tY", date));
}
/**
* 获取月份
*
* @param date
* @return
*/
public static Integer getMonth(Date date) {
return Integer.valueOf(String.format("%tm", date));
}
/**
* 获取当前时间上个月的1号
*
* @return
*/
public static String getLastMonthLastDay() {
Calendar calendar = Calendar.getInstance();
System.out.println("test当前时间:" + formatTime(calendar.getTime()));
// calendar.add(Calendar.MONTH, -1);
// calendar.set(Calendar.DAY_OF_MONTH, 1);
calendar.set(Calendar.DAY_OF_MONTH, 1);
calendar.add(Calendar.DATE, -1);
String firstDay = formatTime(calendar.getTime(), FORMAT_YYYY_MM_DD);
return firstDay;
}
/**
* 验证开始时间小于结束时间
*
* @param startDate 09:00
* @param endDate 18:00
* @return
*/
public static Boolean timeCompare(String startDate, String endDate) {
Boolean flag = Boolean.FALSE;
if (StringUtils.isNotEmpty(startDate) &
&
StringUtils.isNotEmpty(endDate)) {
String dateStr = DateUtils.formatTime(new Date(), "yyyy-MM-dd");
Date start = DateUtils.tDate(dateStr + " " + startDate, "yyyy-MM-dd HH:mm");
Date end = DateUtils.tDate(dateStr + " " + endDate, "yyyy-MM-dd HH:mm");
if (start != null &
&
end != null) {
long startDateLong = start.getTime();
long endDateLong = end.getTime();
if (startDateLong endDateLong) {
flag = Boolean.TRUE;
}
}
}
return flag;
}
/**
* 将时间转化为当天的日期
*
* @param time 09:00
* @return
*/
public static Date convertCurrentDateTime(String time) {
Date date = new Date();
if (StringUtils.isNotEmpty(time)) {
String dateStr = DateUtils.formatTime(date, "yyyy-MM-dd");
date = DateUtils.tDate(dateStr + " " + time, "yyyy-MM-dd HH:mm");
}
return date;
}
/**
* 获取某天天开始时间
*/
public static Date getStartTime(String dateTime) {
Date date = DateUtils.tDate(dateTime);
Calendar todayStart = Calendar.getInstance();
todayStart.setTime(date);
todayStart.set(Calendar.HOUR, 0);
todayStart.set(Calendar.MINUTE, 0);
todayStart.set(Calendar.SECOND, 0);
todayStart.set(Calendar.MILLISECOND, 0);
return todayStart.getTime();
}
/**
* 获取某天结束时间
*/
public static Date getEndTime(String dateTime) {
Date date = DateUtils.tDate(dateTime);
Calendar todayStart = Calendar.getInstance();
todayStart.setTime(date);
todayStart.set(Calendar.HOUR, 23);
todayStart.set(Calendar.MINUTE, 59);
todayStart.set(Calendar.SECOND, 59);
todayStart.set(Calendar.MILLISECOND, 999);
return todayStart.getTime();
}
/**
* 获取时间文件名
*
* @return
*/
public static String dateTimeFile(String fileExtension) {
//创建 StringBuffer 通过构造函数添加 文件累路径
StringBuffer wavName = new StringBuffer("");
Date currentTime = new Date();
SimpleDateFormat formatter = new SimpleDateFormat("yyyyMMddHHmmss");
wavName.append(formatter.format(currentTime));
int num = (int) (Math.random() * (10000 - 1000) + 1000);
wavName.append(num);
wavName.append(".");
wavName.append(fileExtension);
return wavName.toString();
}
/**
* *@desc: 判断今天是星期几 测试输入第二年的1月 2月
* *@param: [date]
* *@return: java.lang.String
* *@create: zhaozhenkun
* *@createtime: 2021/11/2
* *@version: version 0.1
*/
public static Integer getWeekDay(String time) {
//必须yyyy-MM-dd
DateFormat format = new SimpleDateFormat("yyyy-MM-dd");
Date date = null;
try {
date = format.parse(time);
}
catch (ParseException e) {
e.printStackTrace();
}
Instant instant = date.toInstant();
ZoneId zoneId = ZoneId.systemDefault();
LocalDate localDate = instant.atZone(zoneId).toLocalDate();
return localDate.getDayOfWeek().getValue();
}
/**
* 获取明天的日期字符串
*
* @return
*/
public static String tomorrowDateStr() {
Date date = new Date();
//取时间
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
//把日期往后增加一天.整数往后推,负数往前移动(1:表示明天、-1：表示昨天，0：表示今天)
calendar.add(Calendar.DATE, 1);
//这个时间就是日期往后推一天的结果
date = calendar.getTime();
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
String tomorrowStr = formatter.format(date);
return tomorrowStr;
}
/*
* 获取日期的前一天
* */
public static String getSpecifiedDayBefore(String specifiedDay) {
Calendar c = Calendar.getInstance();
Date date = null;
try {
date = new SimpleDateFormat("yy-MM-dd").parse(specifiedDay);
}
catch (ParseException e) {
e.printStackTrace();
}
c.setTime(date);
int day = c.get(Calendar.DATE);
c.set(Calendar.DATE, day - 1);
String dayBefore = new SimpleDateFormat("yyyy-MM-dd").format(c.getTime());
return dayBefore;
}
public static String addDateOne(Date date) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
//把日期往后增加一天.整数往后推,负数往前移动(1:表示明天、-1：表示昨天，0：表示今天)
calendar.add(Calendar.DATE, 1);
//这个时间就是日期往后推一天的结果
date = calendar.getTime();
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
String tomorrowStr = formatter.format(date);
return tomorrowStr;
}
public static String dateToHM(Date date) {
SimpleDateFormat sdf = new SimpleDateFormat("HH:mm");
String str = sdf.format(date);
return str;
}
/**
* 加减对应时间后的日期
*
* @param date 需要加减时间的日期
* @param amount 加减的时间(毫秒)
* @return 加减对应时间后的日期
*/
public static Date subtractTime(Date date, int amount) {
try {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String strTime = sdf.format(date.getTime() + amount);
Date time = sdf.parse(strTime);
return time;
}
catch (Exception e) {
e.printStackTrace();
}
return null;
}
public static String getSevenDaysAgo() {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Calendar c = Calendar.getInstance();
c.add(Calendar.DATE, -7);
Date monday = c.getTime();
String preMonday = sdf.format(monday);
String startTime = preMonday.substring(0, 10) + " 00:00:00";
return startTime;
}
public static String getNowEndTime() {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Date today = new Date();
Calendar calendar = Calendar.getInstance();
calendar.setTime(today);
calendar.set(Calendar.HOUR_OF_DAY, 23);
calendar.set(Calendar.MINUTE, 59);
calendar.set(Calendar.SECOND, 59);
Date day = calendar.getTime();
String preMonday = sdf.format(day);
return preMonday;
}
public static int dateComPareTo(String startDate, String endDate) {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
int result = 0;
try {
Date date1 = sdf.parse(startDate);
Date date2 = sdf.parse(endDate);
if (date1.compareTo(date2) >
0) {
result = 1;
}
else if (date1.compareTo(date2) 0) {
result = -1;
}
else if (date1.compareTo(date2) == 0) {
result = 0;
}
}
catch (ParseException e) {
e.printStackTrace();
}
return result;
}
public static String getFourTeenDaysAgo() {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Calendar c = Calendar.getInstance();
c.add(Calendar.DATE, -14);
Date monday = c.getTime();
String preMonday = sdf.format(monday);
String startTime = preMonday.substring(0, 10) + " 00:00:00";
return startTime;
}
/**
* 判断选择的日期本月的第几天
*/
public static int getWeeksByChooseDay() {
LocalDate now = LocalDate.now();
int dayOfMonth = now.getDayOfMonth();
return dayOfMonth;
}
public static Date getDaysNowSpliceTime(String time, Long minutes) {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Calendar c = Calendar.getInstance();
Date monday = c.getTime();
String preMonday = sdf.format(monday);
String startTime = preMonday.substring(0, 10) + " " + time + ":00";
Date date = tDate(startTime);
Instant instant = date.toInstant();
ZoneId zoneId = ZoneId.systemDefault();
java.time.LocalDateTime localDateTime = instant.atZone(zoneId).toLocalDateTime().minusMinutes(minutes);
ZonedDateTime zdt = localDateTime.atZone(zoneId);
return Date.from(zdt.toInstant());
}
public static String subtractTimeToString(LocalDateTime dateTime, int num) {
LocalDateTime localDateTime = dateTime.minusHours(num);
return localDateTime.toString();
}
public static Boolean isAmOrPm(Date estimatedTimeStart) {
try {
if (estimatedTimeStart != null) {
SimpleDateFormat sdf = new SimpleDateFormat("HH:mm");
Date currentTime = sdf.parse("12:00");
String timeStart = DateUtils.dateToHM(estimatedTimeStart);
Date start = sdf.parse(timeStart);
return currentTime.after(start) ? true : false;
}
else {
return true;
}
}
catch (ParseException e) {
return true;
}
}
public static String getAmountDaysAgo(int amount) {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Calendar c = Calendar.getInstance();
c.add(Calendar.DATE, amount);
Date monday = c.getTime();
String preMonday = sdf.format(monday);
String startTime = preMonday.substring(0, 10);
return startTime;
}
public static String getFirstDayOfLastMonthDay() {
LocalDate today = LocalDate.now();
LocalDate firstDayOfThisMonth = today.withDayOfMonth(1);
LocalDate firstDayOfLastMonth = firstDayOfThisMonth.minusMonths(1);
return firstDayOfLastMonth.format(DateTimeFormatter.ofPattern("yyyy-MM-dd"));
}
public static String getLastDayOfLastMonthDay() {
LocalDate today = LocalDate.now();
LocalDate firstDayOfThisMonth = today.withDayOfMonth(1);
LocalDate lastDayOfLastMonth = firstDayOfThisMonth.minusDays(1);
return lastDayOfLastMonth.format(DateTimeFormatter.ofPattern("yyyy-MM-dd"));
}
public static String getFirstDayOfThisMonth() {
LocalDate today = LocalDate.now();
LocalDate firstDayOfThisMonth = today.withDayOfMonth(1);
return firstDayOfThisMonth.format(DateTimeFormatter.ofPattern("yyyy-MM-dd"));
}
public static String getLastDayOfThisMonth() {
LocalDate today = LocalDate.now();
LocalDate lastDayOfThisMonth = today.withDayOfMonth(today.lengthOfMonth());
return lastDayOfThisMonth.format(DateTimeFormatter.ofPattern("yyyy-MM-dd"));
}
public static String getFirstDayOfPreviousMonth() {
LocalDate today = LocalDate.now();
LocalDate firstDayOfThisMonth = today.withDayOfMonth(1);
LocalDate firstDayOfPreviousMonth = firstDayOfThisMonth.minusMonths(1);
LocalDateTime firstDayOfPreviousMonthWithTime = firstDayOfPreviousMonth.atStartOfDay();
return firstDayOfPreviousMonthWithTime.format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));
}
public static String getLastDayOfPreviousMonth() {
LocalDate today = LocalDate.now();
LocalDate firstDayOfThisMonth = today.withDayOfMonth(1);
LocalDate lastDayOfPreviousMonth = firstDayOfThisMonth.minusDays(1);
LocalDateTime lastSecondOfLastDayOfPreviousMonth = lastDayOfPreviousMonth.atTime(23, 59, 59);
return lastSecondOfLastDayOfPreviousMonth.format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));
}
public static String getTodayStartTime() {
LocalDateTime now = LocalDateTime.now();
LocalDateTime todayStart = now.withHour(0).withMinute(0).withSecond(0).withNano(0);
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
return todayStart.format(formatter);
}
//以获得所需格式的下个月的第一天
public static String getNextMonthFirstDay() {
LocalDate nextMonth = LocalDate.now().plusMonths(1);
LocalDate firstDay = LocalDate.of(nextMonth.getYear(), nextMonth.getMonth(), 1);
LocalDateTime firstDayDateTime = LocalDateTime.of(firstDay, LocalTime.MIN);
return firstDayDateTime.format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));
}
public static void main(String[] args) {
System.out.println(getTodayStartTime());
}
}
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