时间工具类

package com.gwt.utils;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Locale;

/**
 * 
 * @ClassName: DateFormatUtil
 * @Description: TODO(时间格式化工具类)
 * @author wcs
 * @date 2018年4月11日 下午2:01:47
 *
 */
public class DateFormatUtil {

    public static final String DATE_TIME_PATTERN = "yyyy-MM-dd HH:mm:ss";
    public static final String MINUTE_PATTERN = "yyyy-MM-dd HH:mm";
    public static final String HOUR_PATTERN = "yyyy-MM-dd HH:mm:ss";
    public static final String DATE_PATTERN = "yyyy-MM-dd";
    public static final String MONTH_PATTERN = "yyyy-MM";
    public static final String YEAR_PATTERN = "yyyy";
    public static final String MINUTE_ONLY_PATTERN = "mm";
    public static final String HOUR_ONLY_PATTERN = "HH";
    public static final String DATETIME_PATTERN = "yyyyMMddHHmmss";
    public static final String DATEPATTERN = "yyyyMMdd";

    /**
     * 
     * @Title: dateFormat
     * @Description: TODO(时间格式化)
     * @param @param date
     * @param @param pattern
     * @param @return
     * @param @throws ParseException 设定文件
     * @return String 返回类型
     * @throws
     */
    public static String dateFormat(Date date, String pattern) {
        SimpleDateFormat sdf = new SimpleDateFormat(pattern,
                Locale.SIMPLIFIED_CHINESE);
        return sdf.format(date);
    }

    /**
     * 
     * @Title: stringToDate
     * @Description: TODO(字符串格式化日期)
     * @param @param dateString
     * @param @param pattern
     * @param @return 设定文件
     * @return Date 返回类型
     * @throws
     */
    public static Date stringToDate(String dateString, String pattern) {
        SimpleDateFormat sdf = new SimpleDateFormat(pattern);
        try {
            return sdf.parse(dateString);
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 
     * @Title: plusDay
     * @Description: TODO(给指定时间加上天数)
     * @param @param num
     * @param @param newDate
     * @param @param format
     * @param @return 设定文件
     * @return String 返回类型
     * @throws
     */
    public static String plusDay(int num, String date, String formats) {
        SimpleDateFormat format = new SimpleDateFormat(formats);
        try {
            Date oldDate = format.parse(date);
            Calendar ca = Calendar.getInstance();
            ca.setTime(oldDate);
            ca.add(Calendar.DATE, num);// num为增加的天数，可以改变的
            oldDate = ca.getTime();
            String enddate = format.format(oldDate);
            return enddate;
        } catch (ParseException e) {
            e.printStackTrace();
            return null;
        }
    }

    /**
     * 
     * @Title: plusYear
     * @Description: TODO(给指定时间加上年数)
     * @param @param num
     * @param @param date
     * @param @param formats
     * @param @return 设定文件
     * @return String 返回类型
     * @throws
     */
    public static String plusYear(int num, String date, String formats) {
        SimpleDateFormat format = new SimpleDateFormat(formats);
        try {
            Date oldDate = format.parse(date);
            Calendar ca = Calendar.getInstance();
            ca.setTime(oldDate);
            ca.add(Calendar.YEAR, num);// num为增加的年数，可以改变的
            oldDate = ca.getTime();
            String enddate = format.format(oldDate);
            return enddate;
        } catch (ParseException e) {
            e.printStackTrace();
            return null;
        }
    }
}