时间处理工具类

package com.skjd.util; import java.text.DateFormat; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Calendar; import java.util.Date; import java.util.TimeZone; public class DateUtil { private final static SimpleDateFormat sdfYear = new SimpleDateFormat("yyyy"); private final static SimpleDateFormat sdfDay = new SimpleDateFormat( "yyyy-MM-dd"); private final static SimpleDateFormat sdfMouth = new SimpleDateFormat( "yyyy-MM"); private final static SimpleDateFormat sdfDays = new SimpleDateFormat( "yyyyMMdd"); private final static SimpleDateFormat sdfTime = new SimpleDateFormat( "yyyy-MM-dd HH:mm:ss"); public static final String DATE_FORMAT_FULL = "yyyy-MM-dd HH:mm:ss"; public static final String DATE_FORMAT_FULL_MSEL = "yyyyMMddHHmmssSSSS"; /** * 获取YYYY格式 * * @return */ public static String getYear() { return sdfYear.format(new Date()); } /** * 获取YYYY-MM-DD格式 * * @return */ public static String getDay() { return sdfDay.format(new Date()); } /** * 获取YYYYMMDD格式 * * @return */ public static String getDays(){ return sdfDays.format(new Date()); } /** * 获取YYYY-MM-DD HH:mm:ss格式 * * @return */ public static String getTime() { return sdfTime.format(new Date()); } /** * 传入一个时间字符串 * 判断此时间在晚上23点到凌晨6点经过了多久分钟 * YYYY-MM-DD HH:mm:ss */ public static int getNightSum( String s) { Date date = fomatDate(s); String str = sdfTime.format(date); String str2 = str.substring(11, 13); int i = Integer.parseInt(str2); if(i>=23){ return Integer.parseInt(str.substring(14, 16)); }else if(i<6){ i=6-i-1; int j=60-Integer.parseInt(str.substring(14, 16)); return i*60+j; }else { return 0; } } /** * @Title: compareDate * @Description: TODO(日期比较，如果s>=e 返回true 否则返回false) * @param s * @param e * @return boolean * @throws * @author luguosui */ public static boolean compareDate(String s, String e) { if(fomatDate(s)==null||fomatDate(e)==null){ return false; } return fomatDate(s).getTime() >=fomatDate(e).getTime(); } /** * 得到时间戳 * * @param null * @return String 当前日期时间戳(yyyyMMddHHmmssSSSS) */ public static String getTimeStamp() { try { Calendar now = Calendar.getInstance(TimeZone.getDefault()); SimpleDateFormat sdf = new SimpleDateFormat(DATE_FORMAT_FULL_MSEL); sdf.setTimeZone(TimeZone.getDefault()); return (sdf.format(now.getTime())); } catch (Exception e) { return getCurDateTime(); // 如果无法转化，则返回默认格式的时间。  } } /** * 得到当前日期 * * @return String 当前日期 yyyy-MM-dd HH:mm:ss格式 */ public static String getCurDateTime() { Calendar now = Calendar.getInstance(TimeZone.getDefault()); // String DATE_FORMAT = "yyyy-MM-dd HH:mm:ss"; DateFormat sdf = new SimpleDateFormat(DATE_FORMAT_FULL); sdf.setTimeZone(TimeZone.getDefault()); return (sdf.format(now.getTime())); } /** * 格式化日期 * * @return */ public static Date fomatDate(String date) { DateFormat fmt = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); try { return fmt.parse(date); } catch (ParseException e) { e.printStackTrace(); return null; } } /** * 校验日期是否合法 * * @return */ public static boolean isValidDate(String s) { DateFormat fmt = new SimpleDateFormat("yyyy-MM-dd"); try { fmt.parse(s); return true; } catch (Exception e) { // 如果throw java.text.ParseException或者NullPointerException，就说明格式不对 return false; } } public static int getDiffYear(String startTime,String endTime) { DateFormat fmt = new SimpleDateFormat("yyyy-MM-dd"); try { long aa=0; int years=(int) (((fmt.parse(endTime).getTime()-fmt.parse(startTime).getTime())/ (1000 * 60 * 60 * 24))/365); return years; } catch (Exception e) { // 如果throw java.text.ParseException或者NullPointerException，就说明格式不对 return 0; } } /** * <li>功能描述：时间相减得到天数 * @param beginDateStr * @param endDateStr * @return * long * @author Administrator */ public static long getDaySub(String beginDateStr,String endDateStr){ long day=0; java.text.SimpleDateFormat format = new java.text.SimpleDateFormat("yyyy-MM-dd"); java.util.Date beginDate = null; java.util.Date endDate = null; try { beginDate = format.parse(beginDateStr); endDate= format.parse(endDateStr); } catch (ParseException e) { e.printStackTrace(); } day=(endDate.getTime()-beginDate.getTime())/(24*60*60*1000); //System.out.println("相隔的天数="+day); return day; } /** * 得到n天之后的日期 * @param days * @return */ public static String getAfterDayDate(String days) { int daysInt = Integer.parseInt(days); Calendar canlendar = Calendar.getInstance(); // java.util包 canlendar.add(Calendar.DATE, daysInt); // 日期减 如果不够减会将月变动 Date date = canlendar.getTime(); SimpleDateFormat sdfd = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); String dateStr = sdfd.format(date); return dateStr; } /** * 得到n天之后是周几 * @param days * @return */ public static String getAfterDayWeek(String days) { int daysInt = Integer.parseInt(days); Calendar canlendar = Calendar.getInstance(); // java.util包 canlendar.add(Calendar.DATE, daysInt); // 日期减 如果不够减会将月变动 Date date = canlendar.getTime(); SimpleDateFormat sdf = new SimpleDateFormat("E"); String dateStr = sdf.format(date); return dateStr; } /** * 将日期对象转为时间戳字符串 * @param time * @return * @throws ParseException */ public static String dateutil(String time) throws ParseException{ SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm"); Date date = format.parse(time); time = ""+date.getTime(); return time; } /** * 将日期对象转为时间戳 * @param time * @return * @throws ParseException */ public static Long dateutilToLong(String time) throws ParseException{ SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm"); Date date = format.parse(time); Long time2 = date.getTime(); return time2; } public static String parseDateToStr(Date thedate) { // String format = "yyyy-MM-dd"; return parseDateToString(thedate, DATE_FORMAT_FULL); } public static String parseDateToString(Date thedate, String format) { DateFormat df = new SimpleDateFormat(format); if (thedate != null) { return df.format(thedate.getTime()); } return ""; } /** * 获取当前时间前一个月的时间 * @param args */ public static String getDateLastMouth(){ Calendar c = Calendar.getInstance(); c.setTime(new Date()); c.add(Calendar.MONTH, -1); Date m = c.getTime(); return sdfTime.format(m); } /** * 获取当月第一天的日期 * @return */ public static String getMouthNoOne(){ return sdfMouth.format(new Date())+"-01 00:00"; } public static void main(String[] args) { boolean b = compareDate("2018-08-18 00:00", DateUtil.getTime()); System.out.println(b); } }