1.本周开始时间戳 - 以星期一为本周的第一天
public static String getWeekStartTime() {
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss", Locale.getDefault());
Calendar cal = Calendar.getInstance();
int day_of_week = cal.get(Calendar.DAY_OF_WEEK) - 1;
if (day_of_week == 0) {
day_of_week = 7;
}
cal.add(Calendar.DATE, -day_of_week + 1);
return simpleDateFormat.format(cal.getTime());
}
2.本周结束时间戳 - 以星期一为本周的第一天
public static String getWeekEndTime() {
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss", Locale.getDefault());
Calendar cal = Calendar.getInstance();
int day_of_week = cal.get(Calendar.DAY_OF_WEEK) - 1;
if (day_of_week == 0) {
day_of_week = 7;
}
cal.add(Calendar.DATE, -day_of_week + 7);
return simpleDateFormat.format(cal.getTime());
}
3.本月开始时间戳
public static String getMonthStartTime() {
Calendar c = Calendar.getInstance();
c.add(Calendar.MONTH, 0);
c.set(Calendar.DAY_OF_MONTH, 1);//设置为1号,当前日期既为本月第一天
//将小时至0
c.set(Calendar.HOUR_OF_DAY, 0);
//将分钟至0
c.set(Calendar.MINUTE, 0);
//将秒至0
c.set(Calendar.SECOND, 0);
//将毫秒至0
c.set(Calendar.MILLISECOND, 0);
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss", Locale.getDefault());
String dateString = format.format(c.getTime());
Date date = null;
try {
date = format.parse(dateString);
} catch (ParseException e) {
e.printStackTrace();
}
return format.format(date);
}
4.获取当前的星期数
public static int setCurrentDayOfWeek(Calendar calendar) {
//一周第一天是否为星期天
boolean isFirstSunday = (calendar.getFirstDayOfWeek() == Calendar.SUNDAY);
//获取周几
int weekDay = calendar.get(Calendar.DAY_OF_WEEK);
calendar.setFirstDayOfWeek(Calendar.MONDAY);
//若一周第一天为星期天，则-1
if (isFirstSunday) {
weekDay = weekDay - 1;
if (weekDay == 0) {
weekDay = 7;
}
}
return weekDay;
}
5. 获取date类型的时分秒
public static String getTime(Date date) {
SimpleDateFormat dateFormat = new SimpleDateFormat("HH:mm:ss");
return dateFormat.format(date);
}
6.获取date类型的年月日
public static String getDate(Date date) {
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
return dateFormat.format(date);
}
7.根据日期获取本周一的时间
public static Date getThisWeekMonday(Date date) {
Calendar cal = Calendar.getInstance();
cal.setTime(date);
// 获得当前日期是一个星期的第几天
int dayWeek = cal.get(Calendar.DAY_OF_WEEK);
if (1 == dayWeek) {
cal.add(Calendar.DAY_OF_MONTH, -1);
}
// 设置一个星期的第一天，按中国的习惯一个星期的第一天是星期一
cal.setFirstDayOfWeek(Calendar.MONDAY);
// 获得当前日期是一个星期的第几天
int day = cal.get(Calendar.DAY_OF_WEEK);
// 根据日历的规则，给当前日期减去星期几与一个星期第一天的差值
cal.add(Calendar.DATE, cal.getFirstDayOfWeek() - day);
return cal.getTime();
}
8.时间字符串加/减天数
public static String dateStrToAddDay(String strDate, int dayNums) {
Calendar c = Calendar.getInstance();
c.setTime(DateTime.dateToString(strDate, "yyyy-MM-dd"));
c.add(Calendar.DAY_OF_MONTH, dayNums);
return DateTime.dateToString(c.getTime(), "yyyy-MM-dd");
}
9.返回当前时间的前7天集合
public static List
List
Calendar c = Calendar.getInstance();
c.setTime(DateTime.dateToString(strDate, "yyyy-MM-dd"));
for (int i = 0; i < 7; i++) {
c.add(Calendar.DATE, -1);
dateList.add(DateTime.dateToString(c.getTime(), "yyyy-MM-dd"));
}
return dateList;
}
10.给定开始时间 结束时间 返回天数集合
public static List
int interval = 0;
try {
if (startTime.length() == "yyyy-MM-dd HH:mm:ss".length()) {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Date d1 = sdf.parse(startTime);
Date d2 = sdf.parse(endTime);
interval = daysBetween(d1, d2);
}
if (startTime.length() == "yyyy-MM-dd".length()) {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Date d1 = sdf.parse(startTime);
Date d2 = sdf.parse(endTime);
interval = daysBetween(d1, d2);
}
} catch (ParseException e) {
e.printStackTrace();
}
List
Calendar c = Calendar.getInstance();
c.setTime(DateTime.dateToString(startTime, "yyyy-MM-dd"));
for (int i = 0; i <= interval; i++) {
dateList.add(DateTime.dateToString(c.getTime(), "yyyy-MM-dd"));
c.add(Calendar.DATE, 1);
}
return dateList;
}
11.获取今天日期 yyyy-MM-dd HH:mm:ss
public static String getDataFroDatTime() {
Date date = new Date();
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String data = formatter.format(date);
return data;
}
12.获取两个时间段的所有日期
public static List
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
List
try {
Calendar startDay = Calendar.getInstance();
startDay.setTime(format.parse(begin));
startDay.add(Calendar.DATE, -1);
while (true) {
startDay.add(Calendar.DATE, 1);
Date newDate = startDay.getTime();
String newend = format.format(newDate);
betweenList.add(newend);
if (end.equals(newend)) {
break;
}
}
} catch (Exception e) {
e.printStackTrace();
}
return betweenList;
}
13.判断当前时间是否在时间段内
public static Boolean belongCalendar(String beginTime, String endTime) {
SimpleDateFormat df = new SimpleDateFormat("HH:mm:ss");//设置日期格式
Date now = null;
Date beginTimeByDate = null;
Date endTimeByDate = null;
try {
now = df.parse(df.format(new Date()));
beginTimeByDate = df.parse(beginTime);
endTimeByDate = df.parse(endTime);
} catch (Exception e) {
e.printStackTrace();
}
Boolean flag = belongCalendar(now, beginTimeByDate, endTimeByDate);
return flag;
}
14.判断时间是否在时间段内
public static boolean belongCalendar(Date nowTime, Date beginTime, Date endTime) {
Calendar date = Calendar.getInstance();
date.setTime(nowTime);
Calendar begin = Calendar.getInstance();
begin.setTime(beginTime);
Calendar end = Calendar.getInstance();
end.setTime(endTime);
if (date.after(begin) && date.before(end)) {
return true;
} else {
return false;
}
}
15.获取某个时间段内所有日期
public static List
List
try {
SimpleDateFormat sd = new SimpleDateFormat("yyyy-MM-dd");
Date dBegin = sd.parse(begin);
Date dEnd = sd.parse(end);
lDate.add(sd.format(dBegin));
Calendar calBegin = Calendar.getInstance();
// 使用给定的 Date 设置此 Calendar 的时间
calBegin.setTime(dBegin);
Calendar calEnd = Calendar.getInstance();
// 使用给定的 Date 设置此 Calendar 的时间
calEnd.setTime(dEnd);
// 测试此日期是否在指定日期之后
while (dEnd.after(calBegin.getTime())) {
// 根据日历的规则，为给定的日历字段添加或减去指定的时间量
calBegin.add(Calendar.DAY_OF_MONTH, 1);
lDate.add(sd.format(calBegin.getTime()));
}
} catch (ParseException e) {
e.printStackTrace();
}
return lDate;
}
16.减一天
public static String dataBeforeDay(String dateOld) {
DateFormat df = new SimpleDateFormat("yyyy-MM-dd");
/**
* 减少一天
*/
try {
long dif = df.parse(dateOld).getTime() - 86400 * 1000; //减一天
Date date = new Date();
date.setTime(dif);
return df.format(date);
} catch (ParseException e) {
e.printStackTrace();
}
return "";
}
17.增加一天
public static String dataAfterDay(String dateOld) {
DateFormat df = new SimpleDateFormat("yyyy-MM-dd");
try {
Date dd = df.parse(dateOld);
Calendar calendar = Calendar.getInstance();
calendar.setTime(dd);
calendar.add(Calendar.DAY_OF_MONTH, 1);//增加一天
System.out.println("增加一天之后：" + df.format(calendar.getTime()));
} catch (ParseException e) {
e.printStackTrace();
}
return "";
}
18：判断俩个日期段是否重叠
/**
* 判断俩个日期段是否重叠
*/
public static SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm");
public static boolean isOverlap(String startdate1, String enddate1, String startdate2, String enddate2) {
Date leftStartDate = null;
Date leftEndDate = null;
Date rightStartDate = null;
Date rightEndDate = null;
try {
leftStartDate = format.parse(startdate1);
leftEndDate = format.parse(enddate1);
rightStartDate = format.parse(startdate2);
rightEndDate = format.parse(enddate2);
} catch (ParseException e) {
return false;
}
return
((leftStartDate.getTime() >= rightStartDate.getTime()) && leftStartDate.getTime() < rightEndDate.getTime())
|| ((leftStartDate.getTime() > rightStartDate.getTime()) && leftStartDate.getTime() < rightEndDate.getTime())
|| ((rightStartDate.getTime() >= leftStartDate.getTime()) && rightStartDate.getTime() < leftEndDate.getTime())
|| ((rightStartDate.getTime() > leftStartDate.getTime()) && rightStartDate.getTime() < leftEndDate.getTime());
}
19. 获得某天最大时间2017-10-15 23:59:59
public static Date getEndOfDay(Date date) {
LocalDateTime localDateTime = LocalDateTime.ofInstant(Instant.ofEpochMilli(date.getTime()), ZoneId.systemDefault());
LocalDateTime endOfDay = localDateTime.with(LocalTime.MAX);
return Date.from(endOfDay.atZone(ZoneId.systemDefault()).toInstant());
}
20. 获得某天最小时间2017-10-15 00:00:00
public static Date getStartOfDay(Date date) {
LocalDateTime localDateTime = LocalDateTime.ofInstant(Instant.ofEpochMilli(date.getTime()), ZoneId.systemDefault());
LocalDateTime startOfDay = localDateTime.with(LocalTime.MIN);
return Date.from(startOfDay.atZone(ZoneId.systemDefault()).toInstant());
}