java处理日期函数汇总(经典收藏)

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java处理日期函数汇总(经典收藏) public DateUtil(){}/** * @see 取得当前日期（格式为：yyyy-MM-dd） * @return String */ public String GetDate() { SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); String sDate = sdf.format(new Date()); return sDate; } -------------------------------------------------------------------------------- /** * @see 取得当前时间（格式为：yyy-MM-dd HH:mm:ss） * @return String */ public static String GetDateTime() { SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); String sDate = sdf.format(new Date()); return sDate; } -------------------------------------------------------------------------------- /** * @see 按指定格式取得当前时间() * @return String */ public String GetTimeFormat(String strFormat) { SimpleDateFormat sdf = new SimpleDateFormat(strFormat); String sDate = sdf.format(new Date()); return sDate; } -------------------------------------------------------------------------------- /** * @see 取得指定时间的给定格式() * @return String * @throws ParseException */ public String SetDateFormat(String myDate,String strFormat) throws ParseException { SimpleDateFormat sdf = new SimpleDateFormat(strFormat); String sDate = sdf.format(sdf.parse(myDate)); return sDate; } -------------------------------------------------------------------------------- public String FormatDateTime(String strDateTime, String strFormat) { String sDateTime = strDateTime; try { Calendar Cal = parseDateTime(strDateTime); SimpleDateFormat sdf = null; sdf = new SimpleDateFormat(strFormat); sDateTime = sdf.format(Cal.getTime()); } catch (Exception e) { } return sDateTime; } -------------------------------------------------------------------------------- public static Calendar parseDateTime(String baseDate) { Calendar cal = null; cal = new GregorianCalendar(); int yy = Integer.parseInt(baseDate.substring(0, 4)); int mm = Integer.parseInt(baseDate.substring(5, 7)) - 1; int dd = Integer.parseInt(baseDate.substring(8, 10)); int hh = 0; int mi = 0; int ss = 0; if(baseDate.length() > 12) { hh = Integer.parseInt(baseDate.substring(11, 13)); mi = Integer.parseInt(baseDate.substring(14, 16)); ss = Integer.parseInt(baseDate.substring(17, 19)); } cal.set(yy, mm, dd, hh, mi, ss); return cal; } public int getDay(String strDate) { Calendar cal = parseDateTime(strDate); return cal.get(Calendar.DATE); } -------------------------------------------------------------------------------- public int getMonth(String strDate) { Calendar cal = parseDateTime(strDate); return cal.get(Calendar.MONTH) + 1; } -------------------------------------------------------------------------------- public int getWeekDay(String strDate) { Calendar cal = parseDateTime(strDate); return cal.get(Calendar.DAY_OF_WEEK); } -------------------------------------------------------------------------------- public String getWeekDayName(String strDate) { String mName[] = { "日", "一", "二", "三", "四", "五", "六" }; int iWeek = getWeekDay(strDate); iWeek = iWeek - 1; return "星期" + mName[iWeek]; } -------------------------------------------------------------------------------- public int getYear(String strDate) { Calendar cal = parseDateTime(strDate); return cal.get(Calendar.YEAR) + 1900; } -------------------------------------------------------------------------------- public String DateAdd(String strDate, int iCount, int iType) { Calendar Cal = parseDateTime(strDate); int pType = 0; if(iType == 0) { pType = 1; } else if(iType == 1) { pType = 2; } else if(iType == 2) { pType = 5; } else if(iType == 3) { pType = 10; } else if(iType == 4) { pType = 12; } else if(iType == 5) { pType = 13; } Cal.add(pType, iCount); SimpleDateFormat sdf = null; if(iType <= 2) sdf = new SimpleDateFormat("yyyy-MM-dd"); else sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); String sDate = sdf.format(Cal.getTime()); return sDate; } -------------------------------------------------------------------------------- public String DateAdd(String strOption, int iDays, String strStartDate) { if(!strOption.equals("d")); return strStartDate; } -------------------------------------------------------------------------------- public int DateDiff(String strDateBegin, String strDateEnd, int iType) { Calendar calBegin = parseDateTime(strDateBegin); Calendar calEnd = parseDateTime(strDateEnd); long lBegin = calBegin.getTimeInMillis(); long lEnd = calEnd.getTimeInMillis(); int ss = (int)((lBegin - lEnd) / 1000L); int min = ss / 60; int hour = min / 60; int day = hour / 24; if(iType == 0) return hour; if(iType == 1) return min; if(iType == 2) return day; else return -1; } -------------------------------------------------------------------------------- /***************************************** * @功能判断某年是否为闰年 * @return boolean * @throws ParseException ****************************************/ public boolean isLeapYear(int yearNum){ boolean isLeep = false; /**判断是否为闰年，赋值给一标识符flag*/ if((yearNum % 4 == 0) && (yearNum % 100 != 0)){ isLeep = true; } else if(yearNum % 400 ==0){ isLeep = true; } else { isLeep = false; } return isLeep; }-------------------------------------------------------------------------------- /***************************************** * @功能计算当前日期某年的第几周 * @return interger * @throws ParseException ****************************************/ public int getWeekNumOfYear(){ Calendar calendar = Calendar.getInstance(); int iWeekNum = calendar.get(Calendar.WEEK_OF_YEAR); return iWeekNum; } -------------------------------------------------------------------------------- /***************************************** * @功能计算指定日期某年的第几周 * @return interger * @throws ParseException ****************************************/ public int getWeekNumOfYearDay(String strDate ) throws ParseException{ Calendar calendar = Calendar.getInstance(); SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd"); Date curDate = format.parse(strDate); calendar.setTime(curDate); int iWeekNum = calendar.get(Calendar.WEEK_OF_YEAR); return iWeekNum; } } -------------------------------------------------------------------------------- /***************************************** * @功能计算某年某周的开始日期 * @return interger * @throws ParseException ****************************************/ public String getYearWeekFirstDay(int yearNum,int weekNum) throws ParseException { Calendar cal = Calendar.getInstance(); cal.set(Calendar.YEAR, yearNum); cal.set(Calendar.WEEK_OF_YEAR, weekNum); cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY); //分别取得当前日期的年、月、日 String tempYear = Integer.toString(yearNum); String tempMonth = Integer.toString(cal.get(Calendar.MONTH) + 1); String tempDay = Integer.toString(cal.get(Calendar.DATE)); String tempDate = tempYear + "-" +tempMonth + "-" + tempDay; return SetDateFormat(tempDate,"yyyy-MM-dd"); -------------------------------------------------------------------------------- /***************************************** * @功能计算某年某周的结束日期 * @return interger * @throws ParseException ****************************************/ public String getYearWeekEndDay(int yearNum,int weekNum) throws ParseException { Calendar cal = Calendar.getInstance(); cal.set(Calendar.YEAR, yearNum); cal.set(Calendar.WEEK_OF_YEAR, weekNum + 1); cal.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY); //分别取得当前日期的年、月、日 String tempYear = Integer.toString(yearNum); String tempMonth = Integer.toString(cal.get(Calendar.MONTH) + 1); String tempDay = Integer.toString(cal.get(Calendar.DATE)); String tempDate = tempYear + "-" +tempMonth + "-" + tempDay; return SetDateFormat(tempDate,"yyyy-MM-dd"); } -------------------------------------------------------------------------------- /***************************************** * @功能计算某年某月的开始日期 * @return interger * @throws ParseException ****************************************/ public String getYearMonthFirstDay(int yearNum,int monthNum) throws ParseException { //分别取得当前日期的年、月、日 String tempYear = Integer.toString(yearNum); String tempMonth = Integer.toString(monthNum); String tempDay = "1"; String tempDate = tempYear + "-" +tempMonth + "-" + tempDay; return SetDateFormat(tempDate,"yyyy-MM-dd"); } -------------------------------------------------------------------------------- /***************************************** * @功能计算某年某月的结束日期 * @return interger * @throws ParseException ****************************************/ public String getYearMonthEndDay(int yearNum,int monthNum) throws ParseException { //分别取得当前日期的年、月、日 String tempYear = Integer.toString(yearNum); String tempMonth = Integer.toString(monthNum); String tempDay = "31"; if (tempMonth.equals("1") || tempMonth.equals("3") || tempMonth.equals("5") || tempMonth.equals("7") ||tempMonth.equals("8") || tempMonth.equals("10") ||tempMonth.equals("12")) { tempDay = "31"; } if (tempMonth.equals("4") || tempMonth.equals("6") || tempMonth.equals("9")||tempMonth.equals("11")) { tempDay = "30"; } if (tempMonth.equals("2")) { if (isLeapYear(yearNum)) { tempDay = "29"; } else { tempDay = "28"; } } //System.out.println("tempDay:" + tempDay); String tempDate = tempYear + "-" +tempMonth + "-" + tempDay; return SetDateFormat(tempDate,"yyyy-MM-dd"); } -------------------------------------------------------------------------------- }