@Slf4j
public class DateUtils {
public static final Calendar CALENDAR = Calendar.getInstance();
private DateUtils() {
}
public static final String C_DATE_TIME_FORMAT = "yyyy-MM-dd HH:mm:ss";
public static final String C_DATE_TIME_MIN_FORMAT = "yyyyMMdd HHmmss";
public static final String C_DATE_TIME_FORMAT_SSS = "yyyy-MM-dd HH:mm:ss:SSS";
public static final String C_DATE_TIME_YMD = "yyyyMMdd";
public static final String C_DATE_TIME_HMS = "HHmmss";
public static final String C_DATE_TIME_YYMMDD = "yyyy-MM-dd";
public static final String C_DATE_TIME_YMDHMS = "yyyyMMddHHmmss";
public static final String C_DATE_TIME_YMDH = "yyyyMMddHH";
public static Timestamp currentTimestamp() {
return new Timestamp(System.currentTimeMillis());
}
/**
* 获取当前日期时间
*
* @return
*/
public static String getCurrentDateTime() {
return org.apache.commons.lang3.time.DateFormatUtils.format(new Date(), C_DATE_TIME_FORMAT);
}
/**
* 获取当前日期时间
*
* @return
*/
public static String getCurrentDateTimeSSS() {
return org.apache.commons.lang3.time.DateFormatUtils.format(new Date(), C_DATE_TIME_FORMAT_SSS);
}
/**
* 日期字符串转日期类型
*
* @param dateString sample 2018-06-06 15:53:01
* @return
*/
public static Date pareDate(String dateString) {
return pareDate(C_DATE_TIME_FORMAT, dateString);
}
public static Date pareDateStr(String dateString) {
return pareDate(C_DATE_TIME_MIN_FORMAT, dateString);
}
/**
* 日期字符串转日期类型
*
* @param pattern sample yyyy-MM-dd HH:mm:ss
* @param dateString sample 2018-06-06 15:53:01
* @return
*/
public static Date pareDate(String pattern, String dateString) {
try {
return FastDateFormat.getInstance(pattern).parse(dateString);
} catch (ParseException e) {
throw new RuntimeException(e);
}
}
/**
* yyyy-MM-dd HH:mm:ss
* 格式化时间为默认格式
*
* @param date
* @return
*/
public static String formatDefaultTime(Date date) {
return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(date);
}
/**
* 判断当前时间是否在[startTime, endTime]区间，注意时间格式要一致
*
* @param nowTime 当前时间
* @param startTime 开始时间
* @param endTime 结束时间
* @return
*/
public static boolean isEffectiveDate(Date nowTime, Date startTime, Date endTime) {
if (nowTime.getTime() == startTime.getTime() || nowTime.getTime() == endTime.getTime()) {
return true;
}
Calendar date = Calendar.getInstance();
date.setTime(nowTime);
Calendar begin = Calendar.getInstance();
begin.setTime(startTime);
Calendar end = Calendar.getInstance();
end.setTime(endTime);
return date.after(begin) && date.before(end);
}
/**
* 获取据当前时间差几天的日期
*
* @return
*/
public static Date getDays(int day) {
CALENDAR.setTime(new Date());
CALENDAR.add(Calendar.DATE, day);
Date d = CALENDAR.getTime();
return d;
}
/**
* 计算两个日期相差多少天
*
* @param start-开始时间
* @param end-结束时间
* @return int
*/
public static int getDays(Date start, Date end) {
Calendar aCalendar = Calendar.getInstance();
aCalendar.setTime(start);
int day1 = aCalendar.get(Calendar.DAY_OF_YEAR);
aCalendar.setTime(end);
int day2 = aCalendar.get(Calendar.DAY_OF_YEAR);
return day2 - day1;
}
/**
* 获取 YYYY-MM-DD 00:00:00
*
* @param day-传的参数为当月的对应日期（传1为当月1日凌晨）
* @return date
*/
public static Date getDaysOfMonth(int day){
Calendar calendar = Calendar.getInstance();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
calendar.setTime(new Date());
calendar.set(Calendar.DAY_OF_MONTH, day);
calendar.set(Calendar.HOUR_OF_DAY, 0);
calendar.set(Calendar.MINUTE, 0);
calendar.set(Calendar.SECOND, 0);
calendar.set(Calendar.MILLISECOND,000);
return calendar.getTime();
}
/**
* 获取 YYYY-MM-DD 00:00:00
*
* @param day- 传的参数为当前日期延后几天的参数（传0为当日凌晨）
* @return date
*/
public static Date getDayByNum(int day) {
CALENDAR.setTime(new Date());
CALENDAR.add(Calendar.DATE, day);
CALENDAR.set(CALENDAR.get(Calendar.YEAR), CALENDAR.get(Calendar.MONTH), CALENDAR.get(Calendar.DAY_OF_MONTH), 00, 00, 00);
CALENDAR.set(Calendar.MILLISECOND,000);
return CALENDAR.getTime();
}
/**
* 获取据当前时间差几天的日期
*
* @return
*/
public static Date getDays(Date date, int day) {
CALENDAR.setTime(date);
CALENDAR.add(Calendar.DATE, day);
Date d = CALENDAR.getTime();
return d;
}
/**
* 获取当前时间之前的30天日期
*
* @return
*/
public static Date get30Days() {
CALENDAR.setTime(new Date());
CALENDAR.add(Calendar.DATE, -30);
Date d = CALENDAR.getTime();
return d;
}
/**
* 获取当前时间之前的一个月日期
*
* @return
*/
public static Date getMonthDays() {
CALENDAR.setTime(new Date());
CALENDAR.add(Calendar.MONTH, -1);
Date m = CALENDAR.getTime();
return m;
}
/**
* @description 获取当前时间之前一个月的0点日期的0点。
* @author Huang Yafeng
* @date 2020/4/2 10:04
* @param
* @return
*/
public static Date getBeforeMonth() {
CALENDAR.setTime(new Date());
CALENDAR.add(Calendar.MONTH, -1);
CALENDAR.set(Calendar.HOUR_OF_DAY,0);
CALENDAR.set(Calendar.MINUTE,0);
CALENDAR.set(Calendar.SECOND,0);
CALENDAR.set(Calendar.MILLISECOND,000);
Date m = CALENDAR.getTime();
return m;
}
/**
* 获取当前时间之前的一年日期
*
* @return
*/
public static Date getYearDays() {
CALENDAR.setTime(new Date());
CALENDAR.add(Calendar.YEAR, -1);
Date y = CALENDAR.getTime();
return y;
}
/**
* 字符串转换日期格式
*
* @param time
* @return
*/
public static Date formatTime(String time, String pattern) {
SimpleDateFormat format = new SimpleDateFormat(pattern);
Date date = null;
try {
date = format.parse(time);
} catch (Exception e) {
log.error("日期转换失败[{}]|异常[{}]", time, e);
}
return date;
}
/**
* 日期转换成字符串
*
* @param date
* @return
*/
public static String DateToStr(Date date, String pattern) {
SimpleDateFormat format = new SimpleDateFormat(pattern);
String str = format.format(date);
return str;
}
/**
* 格式化日期类型
*
* @param date
* @param pattern
* @return
*/
public static Date formatDate(Date date, String pattern) {
SimpleDateFormat format = new SimpleDateFormat(pattern);
Date result = null;
try {
result = format.parse(DateToStr(date, pattern));
} catch (Exception e) {
log.error("日期转换失败[{}]|异常[{}]", date, e);
}
return result;
}
/**
* 获取当前hour,24小时制
*/
public static int getHour(Date date) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
return calendar.get(Calendar.HOUR_OF_DAY);
}
/**
* 获取当前时间前一小时
*
* @return
*/
public static String getOneHoursAgoTime() {
String oneHoursAgoTime = "";
Calendar cal = Calendar.getInstance();
cal.set(Calendar.HOUR_OF_DAY, cal.get(Calendar.HOUR_OF_DAY) - 1); //把时间设置为当前时间-1小时，同理，也可以设置其他时间
oneHoursAgoTime = new SimpleDateFormat(C_DATE_TIME_YMDH).format(cal.getTime());//获取到完整的时间
return oneHoursAgoTime;
}
/**
* 校验字符串是否符合格式
*
* @param dateStr
* @param pattern
* @return
*/
public static boolean checkValidDate(String dateStr, String pattern) {
SimpleDateFormat format = new SimpleDateFormat(pattern);
try {
// 设置lenient为false.
// 否则SimpleDateFormat会比较宽松地验证日期，比如2007/02/29会被接受，并转换成2007/03/01
format.setLenient(false);
format.parse(dateStr);
return true;
} catch (Exception e) {
return false;
}
}
/**
* 获取当前日期
*
* @return
*/
public static Date getCurrDate() {
return new Date();
}
/**
* 时间计算
*
* @param calendarKey
* @param timeRange
*/
public static Date[] DateRange(int calendarKey, int timeRange) {
Date[] dates = new Date[2];
Calendar createDt = Calendar.getInstance();
createDt.add(calendarKey, -timeRange);
if (calendarKey == Calendar.SECOND) {
createDt.set(createDt.get(Calendar.YEAR), createDt.get(Calendar.MONTH), createDt.get(Calendar.DAY_OF_MONTH), createDt.get(Calendar.HOUR_OF_DAY), createDt.get(Calendar.MINUTE), ((createDt.get(Calendar.SECOND)) / timeRange) * timeRange);
} else if (calendarKey == Calendar.MINUTE) {
createDt.set(createDt.get(Calendar.YEAR), createDt.get(Calendar.MONTH), createDt.get(Calendar.DAY_OF_MONTH), createDt.get(Calendar.HOUR_OF_DAY), (createDt.get(Calendar.MINUTE) / timeRange) * timeRange, 00);
} else if (calendarKey == Calendar.HOUR_OF_DAY) {
createDt.set(createDt.get(Calendar.YEAR), createDt.get(Calendar.MONTH), createDt.get(Calendar.DAY_OF_MONTH), createDt.get(Calendar.HOUR_OF_DAY), 00, 00);
} else if (calendarKey == Calendar.DAY_OF_MONTH) {
createDt.set(createDt.get(Calendar.YEAR), createDt.get(Calendar.MONTH), createDt.get(Calendar.DAY_OF_MONTH), 00, 00, 00);
}
createDt.set(Calendar.MILLISECOND,000);
Date start = createDt.getTime();
dates[0] = start;
createDt.add(calendarKey, timeRange);
Date end = createDt.getTime();
dates[1] = end;
return dates;
}
public static Date[] DateRangeDay(){
Date[] dates = new Date[2];
Calendar createDt = Calendar.getInstance();
createDt.set(createDt.get(Calendar.YEAR), createDt.get(Calendar.MONTH), createDt.get(Calendar.DAY_OF_MONTH), 00, 00, 00);
createDt.set(Calendar.MILLISECOND,000);
Date start = createDt.getTime();
dates[0] = start;
createDt.add(Calendar.DAY_OF_MONTH, 1);
Date end = createDt.getTime();
dates[1] = end;
return dates;
}
public static void main(String[] args) {
Date data = new Date();
System.out.println(DateToStr(getDaysOfMonth(0),C_DATE_TIME_FORMAT_SSS));
}
}
来源：oschina
链接：https://my.oschina.net/u/4177395/blog/3217281