import java.time.*;
import java.time.format.DateTimeFormatter;
import java.time.temporal.ChronoUnit;public class DateTimeUtils {private static final String DEFAULT_DATE_FORMAT = "yyyy-MM-dd";private static final String DEFAULT_TIME_FORMAT = "HH:mm:ss";private static final String DEFAULT_DATE_TIME_FORMAT = "yyyy-MM-dd HH:mm:ss";static DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");// 获取当前日期public static LocalDate getCurrentDate() {return LocalDate.now();}// 获取当前时间public static LocalTime getCurrentTime() {return LocalTime.now();}// 获取当前日期时间public static LocalDateTime getCurrentDateTime() {return LocalDateTime.now();}// 获取当前时间戳public static long getCurrentTimestamp() {return Instant.now().toEpochMilli();}/*** 生成当前时间字符串，默认格式yyyy-MM-dd HH:mm:ss* @return java.lang.String**/public static String currentDateStr() {LocalDateTime now = LocalDateTime.now();return now.format(formatter);}/*** 指定日期格式生成当前时间字符串* @param formatter* @return java.lang.String**/public static String currentDateStr(String formatter) {LocalDateTime now = LocalDateTime.now();DateTimeFormatter pattern = DateTimeFormatter.ofPattern(formatter);return now.format(pattern);}/****时间转字符串，默认格式化：yyyy-MM-dd HH:mm:ss* @param dateTime* @return java.lang.String**/public static String dateToStr(LocalDateTime dateTime) {return dateTime.format(formatter);}/****时间转字符串* @param dateTime* @param formatter 格式化* @return java.lang.String**/public static String dateToStr(LocalDateTime dateTime, DateTimeFormatter formatter) {return dateTime.format(formatter);}/****判断bigTime是否大于smallTime* @param smallTime* @param bigTime* @return boolean**/public static boolean lessThanTime(String smallTime, String bigTime) {LocalDateTime smallDateTime = LocalDateTime.parse(smallTime, formatter);LocalDateTime bigDateTime = LocalDateTime.parse(bigTime, formatter);return smallDateTime.isBefore(bigDateTime);}/****获取num天前的日期* @param num* @return java.lang.String**/public static String getPastDate(int num) {LocalDate currentDate = LocalDate.now();LocalDate pastDate = currentDate.minusDays(num);DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd");return pastDate.format(formatter);}/****获取近n天的日期字符串集合* @param n* @return java.util.List<java.lang.String>**/public static List<String> getRecentNumDays(int n) {List<String> dates = new ArrayList<>();LocalDate today = LocalDate.now();for (int i = 0; i < n; i++) {LocalDate date = today.minusDays(i);String dateStr = date.format(DateTimeFormatter.ofPattern("MM-dd"));dates.add(dateStr);}return dates;}// 将日期字符串解析成LocalDate对象public static LocalDate parseDate(String date) {return LocalDate.parse(date);}// 将时间字符串解析成LocalTime对象public static LocalTime parseTime(String time) {return LocalTime.parse(time);}// 将日期时间字符串解析成LocalDateTime对象public static LocalDateTime parseDateTime(String dateTime) {return LocalDateTime.parse(dateTime);}// 将日期时间字符串按照指定格式解析成LocalDateTime对象public static LocalDateTime parseDateTime(String dateTime, String format) {DateTimeFormatter formatter = DateTimeFormatter.ofPattern(format);return LocalDateTime.parse(dateTime, formatter);}// 将LocalDate对象格式化成日期字符串public static String formatDate(LocalDate date) {return date.format(DateTimeFormatter.ofPattern(DEFAULT_DATE_FORMAT));}// 将LocalTime对象格式化成时间字符串public static String formatTime(LocalTime time) {return time.format(DateTimeFormatter.ofPattern(DEFAULT_TIME_FORMAT));}// 将LocalDateTime对象格式化成日期时间字符串public static String formatDateTime(LocalDateTime dateTime) {return dateTime.format(DateTimeFormatter.ofPattern(DEFAULT_DATE_TIME_FORMAT));}// 将LocalDateTime对象按照指定格式格式化成日期时间字符串public static String formatDateTime(LocalDateTime dateTime, String format) {return dateTime.format(DateTimeFormatter.ofPattern(format));}// 获取指定日期的星期几（1-7，分别代表周一至周日）public static int getDayOfWeek(LocalDate date) {return date.getDayOfWeek().getValue();}// 获取指定日期的年份public static int getYear(LocalDate date) {return date.getYear();}// 获取指定日期的月份public static int getMonth(LocalDate date) {return date.getMonthValue();}// 获取指定日期的天数public static int getDayOfMonth(LocalDate date) {return date.getDayOfMonth();}// 获取指定日期是当年的第几天public static int getDayOfYear(LocalDate date) {return date.getDayOfYear();}// 获取指定日期是否为闰年public static boolean isLeapYear(LocalDate date) {return date.isLeapYear();}// 获取指定日期之前或之后的几天public static LocalDate plusDays(LocalDate date, long days) {return date.plusDays(days);}// 获取指定日期之前或之后的几周public static LocalDate plusWeeks(LocalDate date, long weeks) {return date.plusWeeks(weeks);}// 获取指定日期之前或之后的几个月public static LocalDate plusMonths(LocalDate date, long months) {return date.plusMonths(months);}// 获取指定日期之前或之后的几年public static LocalDate plusYears(LocalDate date, long years) {return date.plusYears(years);}// 获取指定日期之前或之后的几小时public static LocalDateTime plusHours(LocalDateTime dateTime, long hours) {return dateTime.plusHours(hours);}// 获取指定日期之前或之后的几分钟public static LocalDateTime plusMinutes(LocalDateTime dateTime, long minutes) {return dateTime.plusMinutes(minutes);}// 获取指定日期之前或之后的几秒钟public static LocalDateTime plusSeconds(LocalDateTime dateTime, long seconds) {return dateTime.plusSeconds(seconds);}// 获取指定日期之前或之后的几毫秒public static LocalDateTime plusMilliseconds(LocalDateTime dateTime, long milliseconds) {return dateTime.plus(milliseconds, ChronoUnit.MILLIS);}// 获取指定日期之前或之后的几纳秒public static LocalDateTime plusNanoseconds(LocalDateTime dateTime, long nanoseconds) {return dateTime.plus(nanoseconds, ChronoUnit.NANOS);}// 比较两个日期的先后顺序（返回值小于0表示date1在date2之前，等于0表示两个日期相等，大于0表示date1在date2之后）public static int compareDates(LocalDate date1, LocalDate date2) {return date1.compareTo(date2);}// 判断两个日期是否相等public static boolean areDatesEqual(LocalDate date1, LocalDate date2) {return date1.isEqual(date2);}// 计算两个日期之间的天数差public static long getDaysBetween(LocalDate date1, LocalDate date2) {return ChronoUnit.DAYS.between(date1, date2);}// 计算两个日期之间的周数差public static long getWeeksBetween(LocalDate date1, LocalDate date2) {return ChronoUnit.WEEKS.between(date1, date2);}// 计算两个日期之间的月数差public static long getMonthsBetween(LocalDate date1, LocalDate date2) {return ChronoUnit.MONTHS.between(date1, date2);}// 计算两个日期之间的年数差public static long getYearsBetween(LocalDate date1, LocalDate date2) {return ChronoUnit.YEARS.between(date1, date2);}// 判断指定日期是否在当前日期之前public static boolean isBeforeCurrentDate(LocalDate date) {return date.isBefore(getCurrentDate());}// 判断指定日期是否在当前日期之后public static boolean isAfterCurrentDate(LocalDate date) {return date.isAfter(getCurrentDate());}// 判断指定时间是否在当前时间之前public static boolean isBeforeCurrentTime(LocalTime time) {return time.isBefore(getCurrentTime());}// 判断指定时间是否在当前时间之后public static boolean isAfterCurrentTime(LocalTime time) {return time.isAfter(getCurrentTime());}// 判断指定日期时间是否在当前日期时间之前public static boolean isBeforeCurrentDateTime(LocalDateTime dateTime) {return dateTime.isBefore(getCurrentDateTime());}// 判断指定日期时间是否在当前日期时间之后public static boolean isAfterCurrentDateTime(LocalDateTime dateTime) {return dateTime.isAfter(getCurrentDateTime());}// 判断两个日期时间是否相等public static boolean areDateTimesEqual(LocalDateTime dateTime1, LocalDateTime dateTime2) {return dateTime1.isEqual(dateTime2);}// 计算两个日期时间之间的小时数差public static long getHoursBetween(LocalDateTime dateTime1, LocalDateTime dateTime2) {return ChronoUnit.HOURS.between(dateTime1, dateTime2);}// 计算两个日期时间之间的分钟数差public static long getMinutesBetween(LocalDateTime dateTime1, LocalDateTime dateTime2) {return ChronoUnit.MINUTES.between(dateTime1, dateTime2);}// 计算两个日期时间之间的秒数差public static long getSecondsBetween(LocalDateTime dateTime1, LocalDateTime dateTime2) {return ChronoUnit.SECONDS.between(dateTime1, dateTime2);}// 计算两个日期时间之间的毫秒数差public static long getMillisecondsBetween(LocalDateTime dateTime1, LocalDateTime dateTime2) {return ChronoUnit.MILLIS.between(dateTime1, dateTime2);}// 计算两个日期时间之间的纳秒数差public static long getNanosecondsBetween(LocalDateTime dateTime1, LocalDateTime dateTime2) {return ChronoUnit.NANOS.between(dateTime1, dateTime2);}}
