jdk1.8日期转换（Date、LocalDate、LocalDateTime、Timestamp之间转换）

逃离我推掉我的手 2021-11-09 17:30 1440阅读 0赞

仅记录一下

// Copyright 2016-2101 Pica.
    package com.pica.cloud.health.sms.common.utils;
    
    import java.io.Serializable;
    import java.sql.Timestamp;
    import java.text.SimpleDateFormat;
    import java.time.*;
    import java.time.format.DateTimeFormatter;
    import java.util.Date;
    
    /** * @ClassName SmsDateUtil * @Description 时间处理工具类 * @Author Chongwen.jiang * @Date 2019/6/11 15:53 * @ModifyDate 2019/6/11 15:53 * @Version 1.0 */
    public class SmsDateUtil implements Serializable { 
        public static final String DATE_YYYYMM_PATTERN = "yyyyMM";
        public static final String DATE_YEAR_MONTH_PATTERN = "yyyy-MM";
        public static final String DATE_YEAR_PATTERN = "yyyy";
        public static final String DATE_PATTERN = "yyyy-MM-dd";
        public static final String DATE_TIME_PATTERN = "yyyy-MM-dd HH:mm:ss";
        public static final String DATE_SHORTTIME_PATTERN = "yyyy-MM-dd HH:mm";
        public static final String DATE_PATTERN_2 = "yyyy/MM/dd";
        public static final String DATE_POINT_PATTERN = "yyyy.MM.dd";
        public static final String DATE_POINT2_PATTERN = "yyyy.MM";
        public static final String DATE_YYYYMMDDHHmm = "yyyy年MM月dd日 HH:mm";
        public static final String DATE_HHmmss = "HH:mm:ss";
        public static final String DATE_mdHHmmss = "MM-dd HH:mm:ss";
    
        /** * @Description Date对象转换为LocalDateTime对象 * @Author Chongwen.jiang * @Date 2019/6/11 16:02 * @ModifyDate 2019/6/11 16:02 * @Params [date, pattern] * @Return java.time.LocalDateTime */
        public static LocalDateTime date2LocalDateTime(Date date){ 
            return date.toInstant().atZone(ZoneId.systemDefault()).toLocalDateTime();
        }
    
        /** * @Description LocalDateTime对象转换为Date对象 * @Author Chongwen.jiang * @Date 2019/6/11 16:03 * @ModifyDate 2019/6/11 16:03 * @Params [localDateTime] * @Return java.util.Date */
        public static Date localDateTime2Date(LocalDateTime localDateTime){ 
            ZoneId zoneId = ZoneId.systemDefault();
            ZonedDateTime zdt = localDateTime.atZone(zoneId);
            return Date.from(zdt.toInstant());
        }
    
        /** * @Description LocalDateTime对象转换为指定格式字符串 * @Author Chongwen.jiang * @Date 2019/6/11 16:03 * @ModifyDate 2019/6/11 16:03 * @Params [localDateTime, pattern] * @Return java.lang.String */
        public static String formatTime(LocalDateTime localDateTime, String pattern){ 
            if(null == localDateTime){ 
                localDateTime = LocalDateTime.now();
            }
            return DateTimeFormatter.ofPattern(pattern).format(localDateTime);
        }
    
        /** * @Description timestamp转换为指定格式字符串 * @Author Chongwen.jiang * @Date 2019/6/13 19:09 * @ModifyDate 2019/6/13 19:09 * @Params [date, pattern] * @Return java.lang.String */
        public static String format(Long date, String pattern){ 
            return formatTime(timeStamp2LocalDateTime(date), pattern);
        }
    
        /** * @Description Date对象转换为指定格式字符串 * @Author Chongwen.jiang * @Date 2019/6/13 18:38 * @ModifyDate 2019/6/13 18:38 * @Params [date, pattern] * @Return java.lang.String */
        public static String format(Date date, String pattern){ 
            return new SimpleDateFormat(pattern).format(date);
        }
    
        /** * @Description Date对象转换为LocalDate对象 * @Author Chongwen.jiang * @Date 2019/6/11 16:17 * @ModifyDate 2019/6/11 16:17 * @Params [date] * @Return java.time.LocalDate */
        public static LocalDate date2LocalDate(Date date){ 
            return LocalDateTime.ofInstant(date.toInstant(), ZoneId.systemDefault()).toLocalDate();
        }
    
        /** * @Description Date转换为timestamp * @Author Chongwen.jiang * @Date 2019/6/13 13:16 * @ModifyDate 2019/6/13 13:16 * @Params [date] * @Return long */
        public static long date2Timestamp(Date date){ 
            if(null == date){ 
                date = new Date();
            }
            return Timestamp.valueOf(date2LocalDateTime(date)).getTime();
        }
    
        /** * @Description LocalDateTime转换为timestamp * @Author Chongwen.jiang * @Date 2019/6/13 13:16 * @ModifyDate 2019/6/13 13:16 * @Params [localDateTime] * @Return long */
        public static long localDate2Timestamp(LocalDateTime localDateTime){ 
            if(null == localDateTime){ 
                localDateTime = LocalDateTime.now();
            }
            return Timestamp.valueOf(localDateTime).getTime();
        }
    
        /** * @Description 时间戳转换为LocalDateTime * @Author Chongwen.jiang * @Date 2019/6/13 15:03 * @ModifyDate 2019/6/13 15:03 * @Params [timestamp] * @Return java.time.LocalDateTime */
        public static LocalDateTime timeStamp2LocalDateTime(long timestamp){ 
            return LocalDateTime.ofEpochSecond(timestamp/1000,0,ZoneOffset.ofHours(8));
        }
    
        /** * @Description 时间戳转换为LocalDate * @Author Chongwen.jiang * @Date 2019/6/13 15:03 * @ModifyDate 2019/6/13 15:03 * @Params [timestamp] * @Return java.time.LocalDateTime */
        public static LocalDate timeStamp2LocalDate(long timestamp){ 
            return date2LocalDate(localDateTime2Date(LocalDateTime.ofEpochSecond(timestamp/1000,0,ZoneOffset.ofHours(8))));
        }
    
        /** * @Description 获取两个时间相差小时数 * @Author Chongwen.jiang * @Date 2019/6/15 10:23 * @ModifyDate 2019/6/15 10:23 * @Params [fromDate, toDate] * @Return int */
        public static int compareDate(String fromDate, String toDate) { 
            int  hours = 0;
            try { 
                SimpleDateFormat simpleFormat = new SimpleDateFormat(DATE_SHORTTIME_PATTERN);
                long to = simpleFormat.parse(toDate).getTime();
                long from = simpleFormat.parse(fromDate).getTime();
                hours = (int) ((to - from)/(1000 * 60 * 60));
                System.out.println("QQ"+hours);
            } catch (Exception e) { 
                e.printStackTrace();
            }
            return hours;
        }
    
        /** * @Description 获取两个时间相差天数 * @Author Chongwen.jiang * @Date 2019/6/15 10:25 * @ModifyDate 2019/6/15 10:25 * @Params [startDate, endDate] * @Return long */
        public static long diffDays (LocalDate startDate, LocalDate endDate) { 
            return endDate.toEpochDay() - startDate.toEpochDay();
        }
    
    
    
    
    }