JAVA Date 工具类常用

相信大家在写代码的过程中，会经常遇到日期和字符串之间的格式转换和求日期的需求。

因此我今天整理了一下普遍常用的一些方法，希望可以帮助大家。如果有不对的地方希望指正，有遗漏也请留言提出。

package slpcb;import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;import com.sun.org.apache.xerces.internal.impl.xpath.regex.ParseException;/***
* 项目名称：testClass
* 类名称：DateUtils
* 类描述：
* 创建人：Jie.xiaojun
* 创建时间：2017-12-4 下午04:20:02*/
public class DateUtils {/*** 字符串格式：yyyy-MM-dd HH:mm:ss.sss*/public static final String formatter_yyyyMMddHHmmsssss = "yyyy-MM-dd HH:mm:ss.sss";/*** 字符串格式：yyyy-MM-dd HH:mm:ss*/public static final String formatter_yyyyMMddHHmmss = "yyyy-MM-dd HH:mm:ss";/*** 字符串格式：yyyy-MM-dd HH:mm*/public static final String formatter_yyyyMMddHHmm = "yyyy-MM-dd HH:mm";/*** 字符串格式：yyyy-MM-dd*/public static final String formatter_yyyyMMdd = "yyyy-MM-dd";/*** 字符串格式：yyyy-MM*/public static final String formatter_yyyyMM = "yyyy-MM";/*** 字符串格式：yyyy*/public static final String formatter_yyyy = "yyyy";/*** 字符串格式：MM-dd*/public static final String formatter_MMdd = "MM-dd";/*** 字符串格式：HH:mm:ss*/public static final String formatter_HHmmss = "HH:mm:ss";/*** 字符串格式：HH:mm*/public static final String formatter_HHmm = "HH:mm";/*** 字符串格式：返回星期X(一、二、三、四、五、六、日)*/public static final String formatter_EEEE = "EEEE";public static void main(String args[]){
//      System.out.println(dateToString(new Date(), formatter_yyyyMMddHHmmss));
//      System.out.println(stringtoDate("2017-10-01 12:00", formatter_yyyyMMddHHmm));
//      System.out.println(getCurrentDate(formatter_yyyyMMddHHmmss));
//      System.out.println(getFirstDayOfMonth(new Date(), formatter_yyyyMMddHHmmss, 0));
//      System.out.println(getFirstDayOfMonth(new Date(), formatter_yyyyMMddHHmmss, -12));
//      System.out.println(getFirstDayOfMonth(new Date(), formatter_yyyyMMddHHmmss, 1));
//      System.out.println(getLastDayOfMonth(new Date(), formatter_yyyyMMddHHmmss, 0));
//      System.out.println(getLastDayOfMonth(new Date(), formatter_yyyyMMddHHmmss, -12));
//      System.out.println(getLastDayOfMonth(new Date(), formatter_yyyyMMddHHmmss, 1));
//      System.out.println(getLastDayOfMonth(new Date(), formatter_yyyyMMddHHmmss,2));
//      System.out.println(getHourByDate(date));
//      System.out.println(getDayByDate(date));
//      System.out.println(getMonthByDate(date));
//      System.out.println(getYearByDate(date));
//      System.out.println(daysBetween("2017-11-06 23:59:59","2017-11-07 00:00:00",formatter_yyyyMMdd));
//      System.out.println(minutesBetweenFloat("2017-11-07 23:57:59","2017-11-07 23:58:00",formatter_yyyyMMddHHmmss));
//      System.out.println(minutesBetweenInt("2017-11-07 23:57:00","2017-11-07 23:58:00",formatter_yyyyMMddHHmmss));
//      System.out.println(hoursBetween("2017-11-07 22:58:00", "2017-11-07 23:57:00", formatter_yyyyMMddHHmmss));
//      System.out.println(getNewDateStr("2017-10-31 01:00", formatter_yyyyMMddHHmm, 500, "day"));}/*** @Description: 将日期转换为指定格式的字符串* @param @param date* @param @param format* @param @return   * @return String  * @author Jie.xiaojun* @date 2017-12-4  下午03:58:17*/public static String dateToString(java.util.Date date, String format){String result = "";SimpleDateFormat formater = new SimpleDateFormat(format);try {result = formater.format(date);} catch (Exception e) {}return result;}/*** * @Description: 将指定格式的字符串转换为日期* @param dateStr* @param format* @return java.util.Date  * @author Jie.xiaojun* @date 2017-12-4  下午04:18:06*/public static java.util.Date stringtoDate(String dateStr, String format) {SimpleDateFormat formater = new SimpleDateFormat(format);try {formater.setLenient(false);return formater.parse(dateStr);} catch (Exception e) {return null;}}/*** * @Description: 获取当前时间的指定格式的字符串* @param format* @return String  * @author Jie.xiaojun* @date 2017-12-4  下午05:22:04*/public static String getCurrentDate(String format) {return dateToString(new Date(), format);}/*** * @Description: 获取给定时间第几个月第一天的指定格式字符串* @param date* @param format* @param month* @return String  * @author Jie.xiaojun* @date 2017-12-5  上午08:18:27*/public static String getFirstDayOfMonth(Date date, String format, int month) {Calendar cal = Calendar.getInstance();cal.setTime(date);cal.add(Calendar.MONTH, month);cal.set(Calendar.DATE, 1);cal.set(Calendar.HOUR_OF_DAY, 0);cal.set(Calendar.MINUTE, 0);cal.set(Calendar.SECOND, 0);return dateToString(cal.getTime(), format);}  /*** * @Description: 获取给定时间第几个月最后一天的指定格式字符串* @param date* @param format* @return String  * @author Jie.xiaojun* @date 2017-12-5  上午08:29:48*/public static String getLastDayOfMonth(Date date, String format,int month) {Calendar cal = Calendar.getInstance();cal.setTime(date);cal.set(Calendar.DATE, 1);cal.add(Calendar.MONTH, 1);cal.add(Calendar.DATE, -1);cal.add(Calendar.MONTH, month);cal.set(Calendar.HOUR_OF_DAY, 23);cal.set(Calendar.MINUTE, 59);cal.set(Calendar.SECOND, 59);return dateToString(cal.getTime(), format);}/*** * @Description: 求指定日期的小时数(0到23)* @param date* @return int  * @author Jie.xiaojun* @date 2017-12-5  上午08:51:03*/public static int getHourByDate(Date date) {Calendar calendar = Calendar.getInstance();calendar.setTime(date);return calendar.get(Calendar.HOUR_OF_DAY);}/*** * @Description: 求指定日期是一个月中第几天(1到31)* @param date* @return int  * @author Jie.xiaojun* @date 2017-12-5  上午08:46:32*/public static int getDayByDate(Date date) {Calendar calendar = Calendar.getInstance();calendar.setTime(date);return calendar.get(Calendar.DATE);}/*** * @Description: 求指定日期是一年中第几月（1到12）* @param date* @return int  * @author Jie.xiaojun* @date 2017-12-5  上午08:48:39*/public static int getMonthByDate(Date date) {Calendar calendar = Calendar.getInstance();calendar.setTime(date);return calendar.get(Calendar.MONTH) + 1;}/*** * @Description: 求指定日期的年* @param date* @return int  * @author Jie.xiaojun* @date 2017-12-5  上午08:49:50*/public static int getYearByDate(Date date) {Calendar calendar = Calendar.getInstance();calendar.setTime(date);return calendar.get(Calendar.YEAR);}/*** * @Description: 返回两个指定字符串格式的日期相差天数* @param startDate* @param endDate* @param format* @return int  * @author Jie.xiaojun* @date 2017-12-5  上午09:30:58*/public static int daysBetween(String startDate,String endDate,String format){   Calendar cal = Calendar.getInstance();    cal.setTime(stringtoDate(startDate, format));    long time1 = cal.getTimeInMillis();                 cal.setTime(stringtoDate(endDate, format));long time2 = cal.getTimeInMillis();         long between_days=Math.abs((time2-time1)/(1000*3600*24));     return Integer.parseInt(String.valueOf(between_days));     }  /*** * @Description: 获取两个时间之间的小时差（时间格式必须是yyyy-MM-dd HH yyyy-MM-dd HH:mm yyyy-MM-dd HH:mm:ss yyyy-MM-dd HH:mm:ss.sss）* @param startDate* @param endDate* @param format* @return float  * @author Jie.xiaojun* @date 2017-12-5  上午10:06:35*/public static float hoursBetween(String startDate,String endDate,String format){   Calendar cal = Calendar.getInstance();    cal.setTime(stringtoDate(startDate, format));    long time1 = cal.getTimeInMillis();                 cal.setTime(stringtoDate(endDate, format));long time2 = cal.getTimeInMillis();         float between_hours=(float) ((time2-time1)/(1000*3600.0));     return between_hours;   }/*** * @Description: 获取两个时间之间的分钟差（时间格式必须是yyyy-MM-dd HH:mm yyyy-MM-dd HH:mm:ss yyyy-MM-dd HH:mm:ss.sss）* @param startDate* @param endDate* @param format* @return float  * @author Jie.xiaojun* @date 2017-12-5  上午10:04:11*/public static float minutesBetweenFloat(String startDate,String endDate,String format){   Calendar cal = Calendar.getInstance();    cal.setTime(stringtoDate(startDate, format));    long time1 = cal.getTimeInMillis();                 cal.setTime(stringtoDate(endDate, format));long time2 = cal.getTimeInMillis();       float between_minutes=(float) ((time2-time1)/(1000*60.0));     return between_minutes;   }  /*** * @Description: 获取两个时间之间的分钟差（时间格式必须是yyyy-MM-dd HH:mm yyyy-MM-dd HH:mm:ss yyyy-MM-dd HH:mm:ss.sss）* @param startDate* @param endDate* @param format* @return int  * @author Jie.xiaojun* @date 2017-12-5  上午10:02:59*/public static int minutesBetweenInt(String startDate,String endDate,String format){   Calendar cal = Calendar.getInstance();    cal.setTime(stringtoDate(startDate, format));    long time1 = cal.getTimeInMillis();                 cal.setTime(stringtoDate(endDate, format));long time2 = cal.getTimeInMillis();       long between_minutes=Math.abs((time2-time1)/(1000*60));      return Integer.parseInt(String.valueOf(between_minutes));}  /*** * @Description: 求指定字符串格式的天数或月份加减* @param dateStr * @param format  常用格式：yyyy-MM-dd HH:mm:ss&&yyyy-MM-dd* @param counts* @param type  month or day* @return String  * @author Jie.xiaojun* @date 2017-12-5  上午10:14:25*/public static String getNewDateStr(String dateStr,String format,int counts,String type){   Calendar cal = Calendar.getInstance();    cal.setTime(stringtoDate(dateStr, format)); if(type!=null&&type.equals("day")){cal.add(Calendar.DAY_OF_YEAR, counts);}if(type!=null&&type.equals("month")){cal.add(Calendar.MONTH, counts);}String  newDateStr= dateToString(cal.getTime(), format);return  newDateStr;} /*** * @Description: 比较字符串是否和格式完全相同* @param str* @param format* @return boolean  * @author Jie.xiaojun* @date 2017-12-4  下午05:07:09*/public static boolean isSameFormat(String str,String format) { boolean convertSuccess=true; SimpleDateFormat formater = new SimpleDateFormat(format); try {              formater.setLenient(false); try {formater.parse(str);} catch (java.text.ParseException e) {convertSuccess=false;} } catch (ParseException e) {convertSuccess=false;}return convertSuccess;}/*** * @Description: 比较字符串是否和格式类似相同* @param str* @param format* @return boolean  * @author Jie.xiaojun* @date 2017-12-4  下午05:07:09*/public static boolean isLikeFormat(String str,String format) { boolean convertSuccess=true; SimpleDateFormat formater = new SimpleDateFormat(format); try {               formater.setLenient(true); try {formater.parse(str);} catch (java.text.ParseException e) {convertSuccess=false;} } catch (ParseException e) {convertSuccess=false;}return convertSuccess;}}

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