Java通用时间处理工具

常用的对date处理的日常总结

import org.apache.commons.lang.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.sql.Timestamp;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.time.Instant;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.ZoneId;
import java.time.temporal.TemporalAdjusters;
import java.util.Calendar;
import java.util.Date;

public class DateUtil {
	public static String dateTimeFormat = "yyyy-MM-dd HH:mm:ss";
	private static String timeFormat = "yyyy-MM-dd HH:mm:ss.SSS";
	private static String timeTamp = "yyyyMMddHHmmssSSS";
	private static Logger log = LoggerFactory.getLogger(WengTaskService.class);
	public static Date abtainUTC() {
		Calendar cal = Calendar.getInstance();
		int zoneOffset = cal.get(Calendar.ZONE_OFFSET);
		int dstOffset = cal.get(Calendar.DST_OFFSET);
		cal.add(Calendar.MILLISECOND, -(zoneOffset + dstOffset));
		int year = cal.get(Calendar.YEAR);
		int month = cal.get(Calendar.MONTH) + 1;
		int day = cal.get(Calendar.DAY_OF_MONTH);
		int hour = cal.get(Calendar.HOUR_OF_DAY);
		int minute = cal.get(Calendar.MINUTE);
		int second = cal.get(Calendar.SECOND);
		int mil = cal.get(Calendar.MILLISECOND);
		StringBuffer UTCTimeBuffer = new StringBuffer();
		UTCTimeBuffer.append(year).append("-").append(month).append("-").append(day).append(" ").append(hour)
		.append(":").append(minute).append(":").append(second).append(".").append(mil);
		try {
			DateFormat format = new SimpleDateFormat(timeFormat);
			Date date = format.parse(UTCTimeBuffer.toString());
			return date;
		} catch (ParseException e) {
			log.error("declaration error in DateUtil.btainUTC()",e);
			return null;
		}

	}

	public static String abtainTamp() {
		Date date = abtainUTC();
		DateFormat formatTamp = new SimpleDateFormat(timeTamp);
		return formatTamp.format(date);
	}

	public static String abtainDate() {
		Date date = abtainUTC();
		DateFormat format = new SimpleDateFormat(timeFormat);
		return format.format(date);
	}

	/**
	 * 获取指定格式的当前时间
	 * @param pattern
	 * @return
	 */
	public static String getTimeByPattern(String pattern) {
		DateFormat format = new SimpleDateFormat(pattern);
		return format.format(new Date());
	}

	public static Date getDateByPattern(String pattern) throws ParseException{
		DateFormat format = new SimpleDateFormat(pattern);
		return format.parse(format.format(new Date()));
	}
	/**
	 * 获取指定时间的当月的初始日期--指定格式
	 * @param date
	 * @param pattern
	 * @return
	 */
	public static String getMonthStartByPattern(Date date, String pattern) {
		Calendar ca = Calendar.getInstance();
		ca.setTime(date);
		ca.add(Calendar.MONTH, 0);
		ca.set(Calendar.DAY_OF_MONTH, 1);
		Date date1 = ca.getTime();
		DateFormat format = new SimpleDateFormat(pattern);
		return format.format(date1);
	}

	/**
	 * 获取指定日期的前、后N天的日期,指定返回格式
	 * @param date
	 * @param n
	 * @param pattern
	 * @return
	 */
	public static String getDateGapN(Date date, int n, String pattern) {
		Calendar ca = Calendar.getInstance();
		ca.setTime(date);
		ca.add(Calendar.DATE, n);
		Date date1 = ca.getTime();
		DateFormat format = new SimpleDateFormat(pattern);
		return format.format(date1);
	}

	/**
	 * 获取指定日期的前、后N天的日期,指定返回格式。 参数date格式yyyy-MM-dd
	 * @param date
	 * @param n
	 * @param pattern
	 * @return
	 * @throws ParseException 
	 */
	public static String getDateGapN(String date, int n, String pattern) throws ParseException {
		if (StringUtils.isEmpty(date)) {
			return null;
		}
		if (StringUtils.isEmpty(pattern)) {
			pattern = "yyyy-MM-dd";
		}
		DateFormat format1 = new SimpleDateFormat("yyyy-MM-dd");
		Date date2 = null;
		date2 = format1.parse(date);
		return getDateGapN(date2, n, pattern);
	}

	/**
	 * 获取指定日期的当前月1号 参数date格式yyyy-MM-dd
	 * @param datestr
	 * @param pattern
	 * @return
	 */
	public static String getFirstDayOfMonth(String datestr, String pattern) {
		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
		SimpleDateFormat sdf1 = new SimpleDateFormat(pattern);
		ParsePosition pos = new ParsePosition(0);
		Date date = sdf.parse(datestr, pos);
		LocalDateTime localDateTime = LocalDateTime.ofInstant(Instant.ofEpochMilli(date.getTime()),
				ZoneId.systemDefault());
		LocalDateTime endOfDay = localDateTime.with(TemporalAdjusters.firstDayOfMonth()).with(LocalTime.MIN);
		Date dates = Date.from(endOfDay.atZone(ZoneId.systemDefault()).toInstant());
		return sdf1.format(dates);
	}

	/**
	 * 获取指定日期的当天数字，2018-11-25 11:25:56 ==> 25
	 * @param date
	 * @return
	 */
	public static int getDateDay(Date date) {
		Calendar ca = Calendar.getInstance();
		ca.setTime(date);
		return ca.get(Calendar.DAY_OF_MONTH);
	}

	/**
	 * 获取指定日期的当天数字，时间格式yyyy-MM-dd
	 * @param date
	 * @return
	 * 
	 */
	public static int getDateDay(String date) {
		// 如果空，则为负
		if (StringUtils.isEmpty(date)) {
			return -1;
		}
		DateFormat format = new SimpleDateFormat("yyyy-MM-dd");
		Date date1 = new Date();
		try {
			date1 = format.parse(date);
		} catch (ParseException e) {
			log.error("declaration error in DateUtil.etDateDay()",e);
		}
		Calendar ca = Calendar.getInstance();
		ca.setTime(date1);
		return ca.get(Calendar.DAY_OF_MONTH);
	}

	/**
	 * 获取指定日期的当天数字，时间格式yyyy-MM-dd
	 * @param date
	 * @return
	 */
	public static String getDateYM(Date date) {
		Calendar ca = Calendar.getInstance();
		ca.setTime(date);
		Date date1 = ca.getTime();
		DateFormat format = new SimpleDateFormat("yyyy-MM");
		return format.format(date1);
	}

	/**
	 * 获取指定日期的年月字符串数组，长度length（length == 6 即是半年），2018-11-25 11:25:56 ==>
	 * {“”，“”，“”，“”，“”，“2018-11”},
	 * @param date
	 * @param length
	 * @return
	 */
	public static String[] getMonthArray(Date date, int length) {
		String[] resS = new String[length];
		DateFormat format = new SimpleDateFormat("yyyy-MM");
		for (int i = length - 1; i >= 0; i--) {
			Calendar ca = Calendar.getInstance();
			ca.setTime(date);
			ca.add(Calendar.MONTH, -i);
			Date date1 = ca.getTime();
			resS[length - 1 - i] = format.format(date1);
		}
		return resS;
	}

	/**
	 * 获取当前月的上月的最后一天,指定返回格式
	 * @param pattern
	 * @return
	 */
	public static String getDateUpMonthLast(String pattern) {
		Calendar ca = Calendar.getInstance();
		ca.add(Calendar.MONTH, 0);
		ca.set(Calendar.DAY_OF_MONTH, 1);
		ca.add(Calendar.DATE, -1);
		Date date1 = ca.getTime();
		DateFormat format = new SimpleDateFormat(pattern);
		return format.format(date1);
	}

	/**
	 * 获取指定日期的上月的最后一天,指定返回格式 参数date格式yyyy-MM-dd
	 * @param date
	 * @param pattern
	 * @return
	 * @throws ParseException 
	 */
	public static String getDateUpMonthLast(String date, String pattern) throws ParseException {
		if (StringUtils.isEmpty(date)) {
			return null;
		}
		if (StringUtils.isEmpty(pattern)) {
			pattern = "yyyy-MM-dd";
		}
		DateFormat format = new SimpleDateFormat("yyyy-MM-dd");
		Date date1 = null;
		date1 = format.parse(date);
		return getDateUpMonthLast(date1, pattern);
	}

	/**
	 * 获取指定日期的上月的最后一天,指定返回格式 参数date格式yyyy-MM-dd
	 * @param date
	 * @param pattern
	 * @return
	 */
	public static String getDateUpMonthLast(Date date, String pattern) {
		if (date == null) {
			return null;
		}
		if (StringUtils.isEmpty(pattern)) {
			pattern = "yyyy-MM-dd";
		}
		Calendar ca = Calendar.getInstance();
		ca.setTime(date);
		ca.add(Calendar.MONTH, 0);
		ca.set(Calendar.DAY_OF_MONTH, 1);
		ca.add(Calendar.DATE, -1);
		Date date2 = ca.getTime();
		DateFormat format1 = new SimpleDateFormat(pattern);
		return format1.format(date2);
	}

	/**
	 * 获取指定日期的上月的初始日期的前一天,指定返回格式 参数date格式yyyy-MM-dd
	 * @param date
	 * @param pattern
	 * @return
	 * @throws ParseException 
	 */
	public static String getDateUpMonthLastBefore(String date, String pattern) throws ParseException {
		if (StringUtils.isEmpty(date)) {
			return "date is null!";
		}
		if (StringUtils.isEmpty(pattern)) {
			pattern = "yyyy-MM-dd";
		}
		DateFormat format = new SimpleDateFormat("yyyy-MM-dd");
		Date date1 = null;
		date1 = format.parse(date);
		Calendar ca = Calendar.getInstance();
		ca.setTime(date1);
		ca.add(Calendar.MONTH, -1);
		ca.set(Calendar.DAY_OF_MONTH, 1);
		ca.add(Calendar.DATE, -1);
		Date date2 = ca.getTime();
		DateFormat format1 = new SimpleDateFormat(pattern);
		return format1.format(date2);
	}

	/**
	 * 获取半年前（按月）的上月的最后一天,指定返回格式
	 * @param pattern
	 * @return
	 */
	public static String getDateHalfYearLast(String pattern) {
		Calendar ca = Calendar.getInstance();
		ca.add(Calendar.MONTH, -5);
		ca.set(Calendar.DAY_OF_MONTH, 1);
		ca.add(Calendar.DATE, -1);
		Date date1 = ca.getTime();
		DateFormat format = new SimpleDateFormat(pattern);
		return format.format(date1);
	}

	/**
	 * 判断时间是否在指定月，时间格式yyyy-MM-dd, mon格式yyyy-MM
	 * @param date
	 * @param mon
	 * @return
	 */
	public static boolean dateIsInMonth(String date, String mon) {
		if ((mon.split("-")[1]).equals(date.split("-")[1])) {
			return true;
		}
		return false;
	}

	/**
	 * 时间字符串转date
	 * @param dateStr
	 * @param pattern
	 * @return
	 * @throws ParseException
	 */
	public static Date getDateByString(String dateStr, String pattern) throws ParseException {
		SimpleDateFormat sdf = new SimpleDateFormat(pattern);
		return sdf.parse(dateStr);
	}

	/**
	 * date转String
	 * @param date
	 * @param partten
	 * @return
	 */
	public static String getStringByDate(Date date,String partten){
		SimpleDateFormat sdf = new SimpleDateFormat(partten);
		return sdf.format(date);
	}

	/**
	 * 获取当前时间时间戳
	 * @return
	 */
	public static Timestamp getTimestampNow() {
		return new Timestamp(System.currentTimeMillis());
	}

	/**
	 * 判断起始日期小于等于截止日期
	 * @param startDate
	 *            yyyy-MM-dd
	 * @param endDate
	 *            yyyy-MM-dd
	 */
	public static boolean compareStartEndDate(String startDate, String endDate) {
		String start = startDate.substring(0,4) + startDate.substring(5,7) + startDate.substring(8,10);
		String end = endDate.substring(0,4) + endDate.substring(5,7) + endDate.substring(8,10);
		return Integer.parseInt(start) <= Integer.parseInt(end);
	}

	/**
	 * 获取指定日期的月日,单个月或日期去掉显示0,如:01月02日->1月2日,11月02日->11月2日
	 * @param date
	 * @return
	 */
	public static String getMonthDayByDate(Date date) {
		DateFormat df = new SimpleDateFormat("MM月dd日");
		String dateStr = df.format(date);
		boolean flag1 = dateStr.substring(0, 1).equals("0");
		boolean flag2 = dateStr.substring(3, 4).equals("0");
		if (flag1 && flag2) {
			return dateStr.substring(1, 3) + dateStr.substring(4, 6);
		}
		if (flag1 && !flag2) {
			return dateStr.substring(1, 6);
		}
		if (!flag1 && flag2) {
			return dateStr.substring(0, 3) + dateStr.substring(4, 6);
		}
		return dateStr;
	}
}