Java日期工具類(最全)

Java7和Java8日期計算工具類

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.Period;
import java.time.ZoneId;
import java.time.format.DateTimeFormatter;
import java.time.temporal.ChronoUnit;
import java.time.temporal.TemporalUnit;
import java.util.Calendar;
import java.util.Date;

public class DateUtils {

    private static final String DATE_FORMAT = "yyyy-MM-dd";

    private static final String TIME_FORMAT = "HH:mm:ss";

    private static final String DATE_TIME_FORMAT = "yyyy-MM-dd HH:mm:ss";

    private static final DateTimeFormatter DATE_FORMATTER = DateTimeFormatter.ofPattern("yyyy-MM-dd");

    private static final DateTimeFormatter TIME_FORMATTER = DateTimeFormatter.ofPattern("HH:mm:ss");

    private static final DateTimeFormatter DATE_TIME_FORMATTER = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");

    /**
     * 格式化日期
     * 
     * @param date
     * @return yyyy-MM-dd
     */
    public static String getFormatDate(Date date) {
        SimpleDateFormat format = new SimpleDateFormat(DATE_FORMAT);
        return format.format(date);
    }

    /**
     * 格式化時間
     * 
     * @param date
     * @return HH:mm:ss
     */
    public static String getFormatTime(Date date) {
        SimpleDateFormat format = new SimpleDateFormat(TIME_FORMAT);
        return format.format(date);
    }

    /**
     * 格式化日期及時間
     * 
     * @param date
     * @return yyyy-MM-dd HH:mm:ss
     */
    public static String getFormatDateTime(Date date) {
        SimpleDateFormat format = new SimpleDateFormat(DATE_TIME_FORMAT);
        return format.format(date);
    }

    /**
     * 格式化日期
     * 
     * @param localDate
     * @return
     */
    public static String getFormatDate(LocalDate localDate) {
        return localDate.format(DATE_FORMATTER);
    }

    /**
     * 格式化時間
     * 
     * @param localDate
     * @return
     */
    public static String getFormatTime(LocalDateTime localDateTime) {
        return localDateTime.format(TIME_FORMATTER);
    }

    /**
     * 格式化日期及時間
     * 
     * @param localDate
     * @return
     */
    public static String getFormatDateTime(LocalDateTime localDateTime) {
        return localDateTime.format(DATE_TIME_FORMATTER);
    }

    /**
     * 日期時間字符串轉LocalDateTime
     * 
     * @param dateStr
     * @return
     */
    public static LocalDateTime dateStrToLocalDateTime(String dateStr) {
        return LocalDateTime.parse(dateStr, DATE_TIME_FORMATTER);
    }

    /**
     * 日期字符串轉LocalDate
     * 
     * @param dateStr
     * @return
     */
    public static LocalDate dateStrToLocalDate(String dateStr) {
        return LocalDate.parse(dateStr, DATE_FORMATTER);
    }

    /**
     * 日期字符串 轉 Date
     * 
     * @param dateStr
     * @return
     */
    public static Date dateStrToDate(String dateStr) {
        return Date.from(LocalDate.parse(dateStr, DATE_FORMATTER).atStartOfDay(ZoneId.systemDefault()).toInstant());

    }

    /**
     * 日期時間字符串 轉 Date
     * 
     * @param dateStr
     * @return
     */
    public static Date dateTimeStrToDate(String dateStr) {
        return Date.from(LocalDateTime.parse(dateStr, DATE_TIME_FORMATTER).atZone(ZoneId.systemDefault()).toInstant());

    }

    /**
     * LocalDate 轉 Date
     * 
     * @param localDate
     * @return
     */
    public static Date localDateToDate(LocalDate localDate) {
        return Date.from(localDate.atStartOfDay(ZoneId.systemDefault()).toInstant());
    }

    /**
     * LocalDateTime 轉 Date
     * 
     * @param localDateTime
     * @return
     */
    public static Date localDateTimeToDate(LocalDateTime localDateTime) {
        return Date.from(localDateTime.atZone(ZoneId.systemDefault()).toInstant());
    }

    /**
     * Date 轉 LocalDate
     * 
     * @return
     */
    public static LocalDate dateToLocalDate(Date date) {
        return date.toInstant().atZone(ZoneId.systemDefault()).toLocalDate();
    }

    /**
     * Date 轉 LocalDateTime
     * 
     * @param date
     * @return
     */
    public static LocalDateTime dateToLocalDateTime(Date date) {
        return date.toInstant().atZone(ZoneId.systemDefault()).toLocalDateTime();
    }

    /**
     * 計算兩個日期時間差
     * 
     * @param start yyyy-MM-dd HH:mm:ss
     * @param end yyyy-MM-dd HH:mm:ss
     * @return
     */
    public static long dateDifference(String start, String end) {
        SimpleDateFormat format = new SimpleDateFormat(DATE_TIME_FORMAT);
        try {
            Date startTime = format.parse(start);
            Date endTime = format.parse(end);
            return endTime.getTime() - startTime.getTime();
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return -1;
    }

    /**
     * 計算兩個日期之間的天數差
     * 
     * @param start 2018-03-01 12:00:00
     * @param end   2018-03-12 12:00:00
     * @return
     */
    public static long calculationDays(String start, String end) {
        SimpleDateFormat simpleFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        try {
            Date fromDate = simpleFormat.parse(start);
            Date toDate = simpleFormat.parse(end);
            long from = fromDate.getTime();
            long to = toDate.getTime();
            long days = (int) ((to - from) / (1000 * 60 * 60 * 24));
            return days;
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return -1;
    }

    /**
     * 計算小時差
     * 
     * @param start
     * @param end
     * @return
     */
    public static long calculationHours(String start, String end) {
        SimpleDateFormat simpleFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        try {
            Date fromDate = simpleFormat.parse(start);
            Date toDate = simpleFormat.parse(end);
            long from = fromDate.getTime();
            long to = toDate.getTime();
            long hours = (int) ((to - from) / (1000 * 60 * 60));
            return hours;
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return -1;
    }

    /**
     * 計算分鍾差
     * 
     * @param start
     * @param end
     * @return
     */
    public static long calculationMinutes(String start, String end) {
        SimpleDateFormat simpleFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        try {
            Date fromDate = simpleFormat.parse(start);
            Date toDate = simpleFormat.parse(end);
            long from = fromDate.getTime();
            long to = toDate.getTime();
            long minutes = (int) ((to - from) / (1000 * 60));
            return minutes;
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return -1;
    }

    
    /**
     * 計算兩個日期之間的秒數差
     * @param start
     * @param end
     * @return
     */
    public static long calculationSecond(String start, String end) {
        SimpleDateFormat simpleFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        try {
            Date fromDate = simpleFormat.parse(start);
            Date toDate = simpleFormat.parse(end);
            long from = fromDate.getTime();
            long to = toDate.getTime();
            long seconds = (int) ((to - from) / 1000);
            return seconds;
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return -1;
    }
    
    
    /**
     * 獲取兩個日期的差  field參數為ChronoUnit.*
     * @param startTime
     * @param endTime
     * @param field  單位(年月日時分秒)
     * @return
     */
    public static long betweenTwoTime(LocalDateTime startTime, LocalDateTime endTime, ChronoUnit field) {
        Period period = Period.between(LocalDate.from(startTime), LocalDate.from(endTime));
        if (field == ChronoUnit.YEARS) 
            return period.getYears();
        if (field == ChronoUnit.MONTHS) 
            return period.getYears() * 12 + period.getMonths();
        return field.between(startTime, endTime);
    }
    
    
    /**
     * 日期加上一個數,根據field不同加不同值,field為ChronoUnit.*
     * @param time
     * @param number
     * @param field
     * @return
     */
    public static LocalDateTime plus(LocalDateTime time, long number, TemporalUnit field) {
        return time.plus(number, field);
    }

    
    /**
     * 日期減去一個數,根據field不同減不同值,field參數為ChronoUnit.*
     * @param time
     * @param number
     * @param field
     * @return
     */
    public static LocalDateTime minu(LocalDateTime time, long number, TemporalUnit field){
        return time.minus(number,field);
    }
    
    
    /**
     * 根據field不同加減不同值
     * @param date  
     * @param field  Calendar.YEAR
     * @param number 1000/-1000
     */
    public static Date calculationDate(Date date, int field, int number) {
        Calendar calendar = Calendar.getInstance();
        calendar.add(field, number);
        return calendar.getTime();
    }
    
    
    /**
     * 比較兩個日期先后
     * @param date1
     * @param date2
     * @return
     */
    public static boolean compareDate(Date firstDate, Date secondDate) {
        return firstDate.getTime() < secondDate.getTime();
    }
    
    
    /**
     * 比較第一個日期是否大於第二個日期
     * @param firstDate 第一個日期
     * @param secondDate 第二個日期
     * @return true-大於;false-不大於
     */
    public boolean localDateIsBefore(LocalDate firstDate, LocalDate secondDate) {
        return firstDate.isBefore(secondDate);
    }
    
    public static void main(String[] args) {
        Date date = new Date();
        LocalDateTime localDate = DateUtils.dateToLocalDateTime(date);
        System.out.println(localDate);
        
        String start = "2020-03-01 12:00:00";
        String end = "2022-03-12 12:01:00";
        long seconds = DateUtils.calculationSecond(start, end);
        System.out.println("相差秒數: " + seconds);
        
        
        long minutes = DateUtils.calculationMinutes(start, end);
        System.out.println("相差分鍾數: " + minutes);
        
        long days = DateUtils.calculationDays(start, end);
        System.out.println("相差天數: " + days);
        
        LocalDateTime startTime = LocalDateTime.of(2000, 10, 13, 11, 11);
        LocalDateTime endTime = LocalDateTime.of(2000, 10, 14, 13, 13);
        long time = DateUtils.betweenTwoTime(startTime, endTime, ChronoUnit.SECONDS);
        System.out.println(time);
        
        date = DateUtils.calculationDate(date, Calendar.DATE, -10);
        System.out.println("減去10天: " + DateUtils.getFormatDate(date));
    }

}

 

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