Time
获取零点
获取某天的零点时间戳
public static Long getZeroDate (Long time) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(new Date(time));
calendar.set(Calendar.HOUR_OF_DAY, 0);
calendar.set(Calendar.MINUTE, 0);
calendar.set(Calendar.SECOND, 0);
return calendar.getTime().getTime();
}
}
long millsec = LocalDateTime.now().withHour(0).withMinute(0).withSecond(0).withNano(0)
.toEpochSecond(ZoneOffset.ofHours(8)) * 1000;
获取几月前1号0点的时间戳
public static Long getMonthBegin(Long dateTimeMillis,int monthago){
Calendar c = Calendar.getInstance();
c.setTime(new Date(dateTimeMillis));
Date date = new Date(dateTimeMillis);
date.setDate(1);
date.setHours(0);
date.setMinutes(0);
date.setSeconds(0);
if(date.getMonth() - 1 <= 0){
date.setYear(date.getYear() - 1);
date.setMonth(12);
}else {
date.setMonth(date.getMonth() - monthago);
}
return date.getTime();
}
public static Long getMonthBegin(Long dateTimeMillis) {
Calendar c = Calendar.getInstance();
c.setTime(new Date(dateTimeMillis));
c.set(Calendar.DAY_OF_MONTH, 1);
c.set(Calendar.HOUR_OF_DAY, 0);
c.set(Calendar.MINUTE, 0);
c.set(Calendar.SECOND,0);
c.set(Calendar.MILLISECOND, 0);
return c.getTimeInMillis() / 1000;
}
获取几天前的0点的日期
public static Long subDate (int num) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(new Date());
calendar.set(Calendar.HOUR_OF_DAY, 0);
calendar.set(Calendar.MINUTE, 0);
calendar.set(Calendar.SECOND, 0);
calendar.add(Calendar.DATE, -num);
return calendar.getTime().getTime();
}
获取相应天前的日期yyyyMMdd
public static String subDateString (int num) {
SimpleDateFormat format = new SimpleDateFormat("yyyyMMdd");
Calendar calendar = Calendar.getInstance();
calendar.add(Calendar.DATE, -num);
Date date = calendar.getTime();
return format.format(date);
}
获取指定时间戳所在月份15号的时间戳/秒
public static Long getMonthMiddle(Long dateTimeMillis) {
Calendar c = Calendar.getInstance();
c.setTime(new Date(dateTimeMillis));
c.set(Calendar.DAY_OF_MONTH, 15);
c.set(Calendar.HOUR_OF_DAY, 23);
c.set(Calendar.MINUTE, 59);
c.set(Calendar.SECOND,59);
c.set(Calendar.MILLISECOND, 999);
return c.getTimeInMillis() / 1000;
}
获取指定时间戳所在月份结束的时间戳/秒
public static Long getMonthEnd(Long dateTimeMillis) {
Calendar c = Calendar.getInstance();
c.setTime(new Date(dateTimeMillis));
c.set(Calendar.DAY_OF_MONTH, c.getActualMaximum(Calendar.DAY_OF_MONTH));
c.set(Calendar.HOUR_OF_DAY, 23);
c.set(Calendar.MINUTE, 59);
c.set(Calendar.SECOND,59);
c.set(Calendar.MILLISECOND, 999);
return c.getTimeInMillis() / 1000;
}
测试Calendar
public class TestCalendar {
public static void main(String[] args) {
Calendar calendar = Calendar.getInstance();
System.out.println(calendar);
calendar.setTime(new Date());
System.out.println(calendar);
System.out.println(calendar.getTime());
System.out.println(calendar.getTime().getTime());
Date date = new Date();
System.out.println(date);
System.out.println(date.getTime());
}
}
SimpleDateFormat 日期格式转换
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
System.out.println(simpleDateFormat.parse("2021-01-01 00:00:00"));
long time = simpleDateFormat.parse("2021-01-01 00:00:00").getTime();
System.out.println(time);
String format = simpleDateFormat.format(new Date());
System.out.println(format);
时间戳与date 默认类型的相互转换
java Time 工具类
public class LocalDateUtils {
public static final String DATETIME_PATTERN = "yyyy-MM-dd HH:mm:ss";
public static final String DATE_PATTERN = "yyyy-MM-dd";
public static final String TIME_PATTERN = "HH:mm:ss";
public static final String UNSIGNED_DATETIME_PATTERN = "yyyyMMddHHmmss";
public static final String UNSIGNED_DATE_PATTERN = "yyyyMMdd";
public static final Integer SPRING = 1;
public static final Integer SUMMER = 2;
public static final Integer AUTUMN = 3;
public static final Integer WINTER = 4;
public static final String SUNDAY = "星期日";
public static final String MONDAY = "星期一";
public static final String TUESDAY = "星期二";
public static final String WEDNESDAY = "星期三";
public static final String THURSDAY = "星期四";
public static final String FRIDAY = "星期五";
public static final String SATURDAY = "星期六";
private static final String YEAR = "year";
private static final String MONTH = "month";
private static final String WEEK = "week";
private static final String DAY = "day";
private static final String HOUR = "hour";
private static final String MINUTE = "minute";
private static final String SECOND = "second";
public static String getLocalDateTimeStr() {
return format(LocalDateTime.now(), DATETIME_PATTERN);
}
public static String getLocalDateStr() {
return format(LocalDate.now(), DATE_PATTERN);
}
public static String getLocalTimeStr() {
return format(LocalTime.now(), TIME_PATTERN);
}
public static String getDayOfWeekStr() {
return format(LocalDate.now(), "E");
}
public static String getDayOfWeekStr(LocalDate localDate) {
String[] weekOfDays = {
MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY, SUNDAY};
int dayOfWeek = localDate.getDayOfWeek().getValue() - 1;
return weekOfDays[dayOfWeek];
}
public static String format(TemporalAccessor temporal, String pattern) {
DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern(pattern);
return dateTimeFormatter.format(temporal);
}
public static LocalDateTime parseLocalDateTime(String localDateTimeStr, String pattern) {
DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern(pattern);
return LocalDateTime.parse(localDateTimeStr, dateTimeFormatter);
}
public static LocalDate parseLocalDate(String localDateStr, String pattern) {
DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern(pattern);
return LocalDate.parse(localDateStr, dateTimeFormatter);
}
public static LocalDateTime plus(LocalDateTime localDateTime, int num, ChronoUnit chronoUnit) {
return localDateTime.plus(num, chronoUnit);
}
public static LocalDateTime minus(LocalDateTime localDateTime, int num, ChronoUnit chronoUnit) {
return localDateTime.minus(num, chronoUnit);
}
public static long getChronoUnitBetween(LocalDateTime start, LocalDateTime end, ChronoUnit chronoUnit) {
return Math.abs(start.until(end, chronoUnit));
}
public static long getChronoUnitBetween(LocalDate start, LocalDate end, ChronoUnit chronoUnit) {
return Math.abs(start.until(end, chronoUnit));
}
public static String getFirstDayOfYearStr() {
return getFirstDayOfYearStr(LocalDateTime.now());
}
public static String getLastDayOfYearStr() {
return getLastDayOfYearStr(LocalDateTime.now());
}
public static String getFirstDayOfYearStr(LocalDateTime localDateTime) {
return getFirstDayOfYearStr(localDateTime, DATETIME_PATTERN);
}
public static String getLastDayOfYearStr(LocalDateTime localDateTime) {
return getLastDayOfYearStr(localDateTime, DATETIME_PATTERN);
}
public static String getFirstDayOfYearStr(LocalDateTime localDateTime, String pattern) {
return format(localDateTime.withDayOfYear(1).withHour(0).withMinute(0).withSecond(0), pattern);
}
public static String getLastDayOfYearStr(LocalDateTime localDateTime, String pattern) {
return format(localDateTime.with(TemporalAdjusters.lastDayOfYear()).withHour(23).withMinute(59).withSecond(59), pattern);
}
public static String getFirstDayOfMonthStr() {
return getFirstDayOfMonthStr(LocalDateTime.now());
}
public static String getLastDayOfMonthStr() {
return getLastDayOfMonthStr(LocalDateTime.now());
}
public static String getFirstDayOfMonthStr(LocalDateTime localDateTime) {
return getFirstDayOfMonthStr(localDateTime, DATETIME_PATTERN);
}
public static String getLastDayOfMonthStr(LocalDateTime localDateTime) {
return getLastDayOfMonthStr(localDateTime, DATETIME_PATTERN);
}
public static String getFirstDayOfMonthStr(LocalDateTime localDateTime, String pattern) {
return format(localDateTime.withDayOfMonth(1).withHour(0).withMinute(0).withSecond(0), pattern);
}
public static String getLastDayOfMonthStr(LocalDateTime localDateTime, String pattern) {
return format(localDateTime.with(TemporalAdjusters.lastDayOfMonth()).withHour(23).withMinute(59).withSecond(59), pattern);
}
public static String getFirstDayOfWeekStr() {
return getFirstDayOfWeekStr(LocalDateTime.now());
}
public static String getLastDayOfWeekStr() {
return getLastDayOfWeekStr(LocalDateTime.now());
}
public static String getFirstDayOfWeekStr(LocalDateTime localDateTime) {
return getFirstDayOfWeekStr(localDateTime, DATETIME_PATTERN);
}
public static String getLastDayOfWeekStr(LocalDateTime localDateTime) {
return getLastDayOfWeekStr(localDateTime, DATETIME_PATTERN);
}
public static String getFirstDayOfWeekStr(LocalDateTime localDateTime, String pattern) {
return format(localDateTime.with(DayOfWeek.MONDAY).withHour(0).withMinute(0).withSecond(0), pattern);
}
public static String getLastDayOfWeekStr(LocalDateTime localDateTime, String pattern) {
return format(localDateTime.with(DayOfWeek.SUNDAY).withHour(23).withMinute(59).withSecond(59), pattern);
}
public static String getStartTimeOfDayStr() {
return getStartTimeOfDayStr(LocalDateTime.now());
}
public static String getEndTimeOfDayStr() {
return getEndTimeOfDayStr(LocalDateTime.now());
}
public static String getStartTimeOfDayStr(LocalDateTime localDateTime) {
return getStartTimeOfDayStr(localDateTime, DATETIME_PATTERN);
}
public static String getEndTimeOfDayStr(LocalDateTime localDateTime) {
return getEndTimeOfDayStr(localDateTime, DATETIME_PATTERN);
}
public static String getStartTimeOfDayStr(LocalDateTime localDateTime, String pattern) {
return format(localDateTime.withHour(0).withMinute(0).withSecond(0), pattern);
}
public static String getEndTimeOfDayStr(LocalDateTime localDateTime, String pattern) {
return format(localDateTime.withHour(23).withMinute(59).withSecond(59), pattern);
}
public static List<String> listDateStrs(String startDate, String endDate, String period) {
List<String> result = new ArrayList<>();
DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern(DATE_PATTERN);
LocalDate end = LocalDate.parse(endDate, dateTimeFormatter);
LocalDate start = LocalDate.parse(startDate, dateTimeFormatter);
LocalDate tmp = start;
switch (period) {
case DAY:
while (start.isBefore(end) || start.isEqual(end)) {
result.add(start.toString());
start = start.plusDays(1);
}
break;
case WEEK:
while (tmp.isBefore(end) || tmp.isEqual(end)) {
if (tmp.plusDays(6).isAfter(end)) {
result.add(tmp.toString() + "," + end);
} else {
result.add(tmp.toString() + "," + tmp.plusDays(6));
}
tmp = tmp.plusDays(7);
}
break;
case MONTH:
while (tmp.isBefore(end) || tmp.isEqual(end)) {
LocalDate lastDayOfMonth = tmp.with(TemporalAdjusters.lastDayOfMonth());
if (lastDayOfMonth.isAfter(end)) {
result.add(tmp.toString() + "," + end);
} else {
result.add(tmp.toString() + "," + lastDayOfMonth);
}
tmp = lastDayOfMonth.plusDays(1);
}
break;
case YEAR:
while (tmp.isBefore(end) || tmp.isEqual(end)) {
LocalDate lastDayOfYear = tmp.with(TemporalAdjusters.lastDayOfYear());
if (lastDayOfYear.isAfter(end)) {
result.add(tmp.toString() + "," + end);
} else {
result.add(tmp.toString() + "," + lastDayOfYear);
}
tmp = lastDayOfYear.plusDays(1);
}
break;
default:
break;
}
return result;
}
public static void main(String[] args) {
System.out.println(getLocalDateTimeStr());
System.out.println(getLocalDateStr());
System.out.println(getLocalTimeStr());
System.out.println(getDayOfWeekStr());
System.out.println(getDayOfWeekStr(LocalDate.now()));
System.out.println("========");
System.out.println(format(LocalDate.now(), UNSIGNED_DATE_PATTERN));
System.out.println("========");
System.out.println(parseLocalDateTime("2020-12-13 11:14:12", DATETIME_PATTERN));
System.out.println(parseLocalDate("2020-12-13", DATE_PATTERN));
System.out.println("========");
System.out.println(plus(LocalDateTime.now(), 3, ChronoUnit.HOURS));
System.out.println(minus(LocalDateTime.now(), 4, ChronoUnit.DAYS));
System.out.println("========");
System.out.println(getChronoUnitBetween(LocalDateTime.now(), parseLocalDateTime("2020-12-12 12:03:12", DATETIME_PATTERN), ChronoUnit.MINUTES));
System.out.println(getChronoUnitBetween(LocalDate.now(), parseLocalDate("2021-12-12", DATE_PATTERN), ChronoUnit.WEEKS));
System.out.println("========");
System.out.println(getFirstDayOfYearStr());
System.out.println(getFirstDayOfYearStr(parseLocalDateTime("2021-12-12 12:03:12", DATETIME_PATTERN)));
System.out.println(getFirstDayOfYearStr(parseLocalDateTime("2021-12-12 12:03:12", DATETIME_PATTERN), UNSIGNED_DATETIME_PATTERN));
System.out.println(getLastDayOfYearStr());
System.out.println(getLastDayOfYearStr(parseLocalDateTime("2021-12-12 12:03:12", DATETIME_PATTERN)));
System.out.println(getLastDayOfYearStr(parseLocalDateTime("2021-12-12 12:03:12", DATETIME_PATTERN), UNSIGNED_DATETIME_PATTERN));
System.out.println("========");
System.out.println(getFirstDayOfMonthStr());
System.out.println(getFirstDayOfMonthStr(parseLocalDateTime("2021-12-12 12:03:12", DATETIME_PATTERN)));
System.out.println(getFirstDayOfMonthStr(parseLocalDateTime("2021-12-12 12:03:12", DATETIME_PATTERN), UNSIGNED_DATETIME_PATTERN));
System.out.println(getLastDayOfMonthStr());
System.out.println(getLastDayOfMonthStr(parseLocalDateTime("2021-12-12 12:03:12", DATETIME_PATTERN)));
System.out.println(getLastDayOfMonthStr(parseLocalDateTime("2021-12-12 12:03:12", DATETIME_PATTERN), UNSIGNED_DATETIME_PATTERN));
System.out.println("========");
System.out.println(getFirstDayOfWeekStr());
System.out.println(getFirstDayOfWeekStr(parseLocalDateTime("2021-12-12 12:03:12", DATETIME_PATTERN)));
System.out.println(getFirstDayOfWeekStr(parseLocalDateTime("2021-12-12 12:03:12", DATETIME_PATTERN), UNSIGNED_DATETIME_PATTERN));
System.out.println(getLastDayOfWeekStr());
System.out.println(getLastDayOfWeekStr(parseLocalDateTime("2021-12-12 12:03:12", DATETIME_PATTERN)));
System.out.println(getLastDayOfWeekStr(parseLocalDateTime("2021-12-12 12:03:12", DATETIME_PATTERN), UNSIGNED_DATETIME_PATTERN));
System.out.println("========");
System.out.println(getStartTimeOfDayStr());
System.out.println(getStartTimeOfDayStr(parseLocalDateTime("2021-12-12 12:03:12", DATETIME_PATTERN)));
System.out.println(getStartTimeOfDayStr(parseLocalDateTime("2021-12-12 12:03:12", DATETIME_PATTERN), UNSIGNED_DATETIME_PATTERN));
System.out.println(getEndTimeOfDayStr());
System.out.println(getEndTimeOfDayStr(parseLocalDateTime("2021-12-12 12:03:12", DATETIME_PATTERN)));
System.out.println(getEndTimeOfDayStr(parseLocalDateTime("2021-12-12 12:03:12", DATETIME_PATTERN), UNSIGNED_DATETIME_PATTERN));
System.out.println("========");
List<String> dateStrs = listDateStrs("2019-01-30", "2020-12-13", YEAR);
for (String dateStr : dateStrs) {
System.out.println(dateStr);
}
System.out.println("========");
List<String> dateStrs1 = listDateStrs("2019-01-30", "2020-12-13", MONTH);
for (String dateStr : dateStrs1) {
System.out.println(dateStr);
}
System.out.println("========");
List<String> dateStrs2 = listDateStrs("2020-12-01", "2020-12-13", DAY);
for (String dateStr : dateStrs2) {
System.out.println(dateStr);
}
}
}
Time 工具类原文