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);
}
}
