add dateutil
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package me.ehlxr.utils;
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import java.text.ParseException;
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import java.text.SimpleDateFormat;
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import java.time.LocalDate;
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import java.time.LocalDateTime;
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import java.time.ZoneId;
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import java.time.format.DateTimeFormatter;
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import java.time.temporal.ChronoUnit;
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import java.util.Calendar;
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import java.util.Date;
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/**
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* 时间工具类
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*
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* @author ehlxr
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* @since 2020-12-09 16:51.
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*/
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public class DateUtil {
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public static final DateTimeFormatter FORMAT = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
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private static final DateTimeFormatter FORMAT_1 = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss.S");
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public static final DateTimeFormatter FORMAT_2 = DateTimeFormatter.ofPattern("yyyy-MM-dd");
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public static final DateTimeFormatter FORMAT_3 = DateTimeFormatter.ofPattern("yyyyMMdd");
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public static final DateTimeFormatter FORMAT_4 = DateTimeFormatter.ofPattern("yyyy-MM");
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/**
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* "Asia/Shanghai"
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*/
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private static final ZoneId ZONE_ID = ZoneId.of(ZoneId.SHORT_IDS.get("CTT"));
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private DateUtil() {
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}
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/**
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* 获取当前日期时间
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*
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* @return 当前日期时间 {@link LocalDateTime}
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*/
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public static LocalDateTime currentDateTime() {
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return LocalDateTime.now(ZONE_ID);
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}
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/**
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* 获取当前日期时间字符串
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*
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* @return "yyyy-MM-dd HH:mm:ss" 格式字符串
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*/
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public static String currentDateTimeStr() {
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return LocalDateTime.now(ZONE_ID).format(FORMAT);
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}
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/**
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* 获取当前日期字符串
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*
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* @return "yyyy-MM-dd" 格式字符串
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*/
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public static String currentDateStr() {
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return LocalDate.now(ZONE_ID).toString();
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}
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/**
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* 计算当前时间以前几个月的时间
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*
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* @param amount 月份
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* @return "yyyy-MM-dd HH:mm:ss" 格式字符串
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*/
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public static String pastMonthsDateTime(long amount) {
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return LocalDateTime.now(ZONE_ID).minus(amount, ChronoUnit.MONTHS).format(FORMAT);
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}
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/**
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* 计算当前时间以前几个月的时间
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*
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* @param amount 月份
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* @return "yyyy-MM-dd" 格式字符串
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*/
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public static String pastMonthsDate(long amount) {
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return LocalDate.now(ZONE_ID).minus(amount, ChronoUnit.MONTHS).toString();
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}
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/**
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* 计算指定时间（yyyy-MM-dd HH:mm:ss 格式字符串）以前几个月的时间
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*
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* @param amount 月份
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* @return "yyyy-MM-dd HH:mm:ss" 格式字符串
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*/
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public static String pastMonthsDate(String localDateTime, long amount) {
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return LocalDateTime.parse(localDateTime, FORMAT).minus(amount, ChronoUnit.MONTHS).format(FORMAT);
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}
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/**
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* 指定日期格式化，带星期
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*/
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public static String asStringWithWeek(String date) {
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LocalDateTime localDateTime = LocalDateTime.parse(date, FORMAT);
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String[] weekDays = {"周一", "周二", "周三", "周四", "周五", "周六", "周日"};
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int w = localDateTime.getDayOfWeek().getValue() - 1;
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return localDateTime.format(FORMAT) + " " + weekDays[w];
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}
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/**
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* LocalDate 转 Date
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*
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* @param localDate 要转换的 {@link LocalDate}
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* @return {@link Date}
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*/
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public static Date asDate(LocalDate localDate) {
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return Date.from(localDate.atStartOfDay().atZone(ZONE_ID).toInstant());
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}
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/**
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* LocalDateTime 转 Date
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*
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* @param localDateTime 要转换的 {@link LocalDateTime}
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* @return {@link Date}
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*/
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public static Date asDate(LocalDateTime localDateTime) {
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return Date.from(localDateTime.atZone(ZONE_ID).toInstant());
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}
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/**
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* Date 转 LocalDate
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*
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* @param date 要转换的 {@link Date}
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* @return {@link LocalDate}
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*/
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public static LocalDate asLocalDate(Date date) {
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return date.toInstant().atZone(ZONE_ID).toLocalDate();
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// return Instant.ofEpochMilli(date.getTime()).atZone(ZONE_ID).toLocalDate();
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}
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/**
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* Date 转 LocalDateTime
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*
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* @param date 要转换的 {@link Date}
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* @return {@link LocalDateTime}
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*/
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public static LocalDateTime asLocalDateTime(Date date) {
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return LocalDateTime.ofInstant(date.toInstant(), ZONE_ID);
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// return date.toInstant().atZone(ZONE_ID).toLocalDateTime();
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// return Instant.ofEpochMilli(date.getTime()).atZone(ZONE_ID).toLocalDateTime();
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}
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/**
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* 日期字符串转 LocalDateTime
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*
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* @param date 要转换的 yyyy-MM-dd HH:mm:ss 类型字符串
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* @return {@link LocalDateTime}
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*/
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public static LocalDateTime asLocalDateTime(String date) {
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return asLocalDateTime(date, FORMAT);
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}
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/**
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* 日期字符串转 LocalDateTime
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*
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* @param date 要转换的字符串
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* @param pattern 模式字符串，例如：yyyy-MM-dd HH:mm:ss
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* @return {@link LocalDateTime}
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*/
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public static LocalDateTime asLocalDateTime(String date, String pattern) {
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return asLocalDateTime(date, DateTimeFormatter.ofPattern(pattern));
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}
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private static LocalDateTime asLocalDateTime(String date, DateTimeFormatter formatter) {
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return LocalDateTime.parse(date, formatter);
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}
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public static Date parse(String strDate) throws ParseException {
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SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
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return sdf.parse(strDate);
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}
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/**
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* 出生日期换年龄
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*
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* @param birthDay
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* @return
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*/
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public static int getAge(Date birthDay) {
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Calendar cal = Calendar.getInstance();
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//出生日期晚于当前时间，无法计算
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if (cal.before(birthDay)) {
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throw new IllegalArgumentException("The birthDay is before Now.It's unbelievable!");
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}
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//当前年份
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int yearNow = cal.get(Calendar.YEAR);
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//当前月份
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int monthNow = cal.get(Calendar.MONTH);
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//当前日期
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int dayOfMonthNow = cal.get(Calendar.DAY_OF_MONTH);
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cal.setTime(birthDay);
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int yearBirth = cal.get(Calendar.YEAR);
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int monthBirth = cal.get(Calendar.MONTH);
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int dayOfMonthBirth = cal.get(Calendar.DAY_OF_MONTH);
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//计算整岁数
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int age = yearNow - yearBirth;
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if (monthNow <= monthBirth) {
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if (monthNow == monthBirth) {
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//当前日期在生日之前，年龄减一
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if (dayOfMonthNow < dayOfMonthBirth) {
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age--;
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}
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} else {
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//当前月份在生日之前，年龄减一
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age--;
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}
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}
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return age;
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}
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public static Integer getDifMonth(Date startDate, Date endDate) {
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Calendar start = Calendar.getInstance();
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Calendar end = Calendar.getInstance();
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start.setTime(startDate);
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end.setTime(endDate);
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int result = end.get(Calendar.MONTH) - start.get(Calendar.MONTH);
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int month = (end.get(Calendar.YEAR) - start.get(Calendar.YEAR)) * 12;
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return Math.abs(month + result);
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}
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public static void main(String[] args) {
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try {
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System.out.println(getDifMonth(DateUtil.parse("2020-11-02 15:43:37"), DateUtil.parse("2020-10-01 15:43:37")));
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} catch (ParseException e) {
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e.printStackTrace();
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}
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System.out.println(asStringWithWeek(currentDateTimeStr()));
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System.out.println("DateUtil.currentDateTime()：" + DateUtil.currentDateTimeStr());
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System.out.println("DateUtil.currentDate()：" + DateUtil.currentDateStr());
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System.out.println("DateUtil.passMonthsDateTime(3)：" + DateUtil.pastMonthsDateTime(3));
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System.out.println("DateUtil.passMonthsDate(3)：" + DateUtil.pastMonthsDate(3));
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// DateTimeFormatter t = new DateTimeFormatterBuilder()
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// .parseCaseInsensitive()
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// .append(ISO_LOCAL_DATE)
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// .appendLiteral(' ')
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// .append(new DateTimeFormatterBuilder()
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// .appendValue(HOUR_OF_DAY, 2)
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// .appendLiteral(':')
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// .appendValue(MINUTE_OF_HOUR, 2)
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// .optionalStart()
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// .appendLiteral(':')
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// .appendValue(SECOND_OF_MINUTE, 2).toFormatter(Locale.CHINA)).toFormatter(Locale.CHINA);
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//
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// System.out.println(LocalDateTime.now().format(t));
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System.out.println("FORMAT Pattern(\"yyyy-MM-dd HH:mm:ss\")：");
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System.out.println("FORMAT_1 Pattern(\"yyyy-MM-dd HH:mm:ss.S\")");
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System.out.println("LocalDateTime.parse(\"2019-07-25 17:15:23.0\", FORMAT_1)：" + LocalDateTime.parse("2019-07-25 17:15:23.0", FORMAT_1));
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System.out.println("passMonthsDate(\"2019-07-25 17:15:23\", 3)：" + pastMonthsDate("2019-07-25 17:15:23", 3));
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System.out.println("LocalDateTime.parse(\"2019-07-25 17:15:23.0\", FORMAT_1).format(FORMAT)：" + LocalDateTime.parse("2019-07-25 17:15:23.0", FORMAT_1).format(FORMAT));
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System.out.println("LocalDate.parse(\"2019-07-25 17:15:23.0\", FORMAT).toString()：" + LocalDate.parse("2019-07-25 17:15:23.0", FORMAT_1).toString());
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// Set<String> set = ZoneId.getAvailableZoneIds();
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// set.forEach(System.out::println);
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// createTime = "2019-07-25 17:15:23";
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// createTime = createTime.substring(0, 19);
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// System.out.println(createTime);
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Date date = new Date();
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System.out.println("当前时间 Date：" + date);
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System.out.println("当前时间 Date asLocalDate：" + DateUtil.asLocalDate(date));
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System.out.println("当前时间 Date asLocalDateTime：" + DateUtil.asLocalDateTime(date).format(FORMAT));
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LocalDateTime localDateTime = DateUtil.currentDateTime();
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System.out.println("当前时间 localDateTime：" + localDateTime);
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System.out.println("当前时间 LocalDateTime asDate：" + DateUtil.asDate(localDateTime));
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System.out.println("当前时间 LocalDate asDate：" + DateUtil.asDate(LocalDate.now()));
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System.out.println(ChronoUnit.YEARS.between(LocalDate.now(), LocalDate.parse("1991-08-30", FORMAT_2)));
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}
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}
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