本文实例主要是关于Java8中的新特性，时间日期api的相关实例，具体如下：

package com.effective.common.base.date;import java.time.Instant;import java.time.LocalDate;import java.time.LocalDateTime;import java.time.LocalTime;import java.time.Period;import java.time.ZoneId;import java.time.format.DateTimeFormatter;import java.time.temporal.ChronoUnit;import java.util.Date;/** * 日期工具类 * @author yanweiqi * @since 2016-5-6 * */public class LocalDateUtils { private static ZoneId zone = ZoneId.systemDefault(); /** * 字符串转Date * @param date * @return * @throws Exception */ public static Date convertToDate(String date) throws Exception{ LocalDate localDate = null; if(null == date){ throw new NullPointerException("date isn't null"); } else { localDate = LocalDate.parse(date); return convertToDate(localDate); } } /** * 字符串转LocalDateTime * @param date * @return localDateTime */ public static LocalDateTime convertToLocalDateTime(String date){ LocalDateTime localDateTime = null; if(null == date){ throw new NullPointerException("date isn't null"); } else { localDateTime = LocalDateTime.parse(date); return localDateTime; } } /** * LocalDate转Date * @param localDate * @return Date */ public static Date convertToDate(LocalDate localDate){ Instant instant = localDate.atStartOfDay().atZone(zone).toInstant(); return Date.from(instant); } /** * LocalDate转Date * @param localDateTime * @return Date */ public static Date convertToDate(LocalDateTime localDateTime){ Instant instant = localDateTime.atZone(zone).toInstant(); return Date.from(instant); } /** * Date转LocalDate * @param date * @return localDate */ public static LocalDate convertToLocalDate(Date date){ Instant instant = date.toInstant(); return convertToLocalDateTime(instant).toLocalDate(); } /** * Date转LocalTime * @param date * @return localDate */ public static LocalTime convertToLocalTime(Date date){ Instant instant = date.toInstant(); return convertToLocalDateTime(instant).toLocalTime(); } /** * Date转LocalDatetime * @param date * @return localDate */ public static LocalDateTime convertToLocalDateTime(Date date){ Instant instant = date.toInstant(); return convertToLocalDateTime(instant); } /** * Instant转LocalDateTime * @param instant * @return */ public static LocalDateTime convertToLocalDateTime(Instant instant){ return LocalDateTime.ofInstant(instant, zone); } /** * LocalDateTime转Instant * @param localDateTime * @return */ public static Instant convertToInstant(LocalDateTime localDateTime){ return localDateTime.atZone(zone).toInstant(); } /** * LocalDate转Instant * @param localDate * @return */ public static Instant convertToInstant(LocalDate localDate){ return localDate.atStartOfDay(zone).toInstant(); } /** * LocalDate转LocalDateTime * @param localDate * @return LocalDateTime */ public static LocalDateTime convertToLocalDateTime(LocalDate localDate){ return localDate.atStartOfDay(); } /** * 日周期格式化 * @param localDateTime * @param formatStyle * @return */ public static String formatter(LocalDateTime localDateTime, String formatStyle){ return DateTimeFormatter.ofPattern(formatStyle).format(localDateTime); } /** * 设置年 * @param sourceDate * @param year * @return LocalDateTime */ public static LocalDateTime setYear(LocalDateTime sourceDate, Integer year){ return sourceDate.withYear(year); } /** * 设置月 * @param sourceDate * @param month * @return LocalDateTime */ public static LocalDateTime setMonth(LocalDateTime sourceDate, Integer month){ return sourceDate.withMonth(month); } /** * 设置天 * @param sourceDate * @param month * @return LocalDateTime */ public static LocalDateTime setDayOfMonth(LocalDateTime sourceDate, Integer dayOfMonth){ return sourceDate.withDayOfMonth(dayOfMonth); } /** * 设置小时 * @param sourceDate * @param hour * @return */ public static LocalDateTime setHour(LocalDateTime sourceDate,Integer hour){ return sourceDate.withHour(hour); } /** * 设置分钟 * @param sourceDate * @param minute * @return */ public static LocalDateTime setMinute(LocalDateTime sourceDate,Integer minute){ return sourceDate.withMinute(minute); } /** * 设置秒 * @param sourceDate * @param second * @return */ public static LocalDateTime setSecond(LocalDateTime sourceDate,Integer second){ return sourceDate.withSecond(second); } /** * 修改年月日 * @param sourceDate * @param year * @param month * @param dayOfMonth * @return */ public static LocalDateTime setYMD(LocalDateTime sourceDate, Integer year, Integer month, Integer dayOfMonth) { return sourceDate.withYear(year).withMonth(month).withDayOfMonth(dayOfMonth); } /** * 修改时分秒 * @param sourceDate * @param hour * @param minute * @param second * @return */ public static LocalDateTime setHMS(LocalDateTime sourceDate,Integer hour, Integer minute, Integer second) { return sourceDate.withHour(hour).withMinute(minute).withSecond(second); } /** * 计算相差的天数 * @param beginDate * @param endDate * @return */ public static int getInteverDays(LocalDate beginDate,LocalDate endDate){ Period period = Period.between(beginDate, endDate); return period.getDays(); } /** * 日期加减 * @param num 数量 * @param unit 单位 * @param LocalDate 原日期 * @return LocalDate 增加后的日期 */ @SuppressWarnings("static-access") public static LocalDate addLocalDate(long num,ChronoUnit unit,final LocalDate localDate){ LocalDate resultDate; if(num > 0){ resultDate = localDate.now().plus(num, unit); } else { resultDate = localDate.now().minus(Math.abs(num), unit); } return resultDate; } /** * 日期时分秒加 * @param num 数量 * @param unit 单位 * @param localDateTime 原日期 * @return LocalDateTime 增加后的日期 */ @SuppressWarnings("static-access") public static LocalDateTime addLocalDateTime(long num,ChronoUnit unit,LocalDateTime localDateTime){ LocalDateTime resultDateTime; if(num > 0){ resultDateTime = localDateTime.now().plus(num, unit); } else { resultDateTime = localDateTime.now().minus(Math.abs(num),unit); } return resultDateTime; } /** * 时分秒加减 * @param num 数量 * @param unit 单位 * @param localTime 原日期 * @return LocalDateTime 增加后的日期 */ @SuppressWarnings("static-access") public static LocalTime addLocalTime(long num,ChronoUnit unit,LocalTime localTime){ LocalTime resultTime; if(num > 0){ resultTime = localTime.now().plus(num, unit); } else { resultTime = localTime.now().minus(Math.abs(num), unit); } return resultTime; } public static void main(String[] args){ LocalDateTime time = LocalDateTime.now(); String rr = formatter(time, "yyyy-MM-dd HH:mm:ss"); System.out.println(rr); LocalDateTime time2 = addLocalDateTime(-2, ChronoUnit.HOURS, time); String yy = formatter(time2, "yyyy-MM-dd HH:mm:ss"); System.out.println(yy); }

代码涉及时间日期类的使用等内容，具有简单注释，大家可自行参考。

总结

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