Java Common date format and date Computing tools class __java

Package com.java.mvc.util;

Import Java.text.DateFormat;
Import java.text.ParseException;
Import Java.text.SimpleDateFormat;
Import java.util.ArrayList;
Import Java.util.Calendar;
Import Java.util.Date;
Import Java.util.GregorianCalendar;
Import java.util.List;

public class Dateutils {

Public final static String format_yyyy_mm_dd = "YYYY-MM-DD";

Public final static String format_yyyy_mm_dd_hh_mm_ss = "Yyyy-mm-dd hh:mm:ss";

Public final static String FORMAT_YYYYMMDD = "YYYYMMDD";

Public final static String format_yyyymm = "Yyyymm";

Public final static String format_yyyy = "YYYY";

Public final static String Format_yyyymmddhhmiss = "YyyyMMdd HH:mm:ss";

Public final static String Format_yyyymmddhhmmss = "YYYYMMDDHHMMSS";

Public final static String format_yyyy_mm_dd_hh_mi_ss = "Yyyy-mm-dd HH:mm:ss";

Public final static String format_yyyy_mm_dd_hh_mi_ss_sss = "Yyyy-mm-dd HH:mm:ss:SSS";

Public final static String format_yyyy_mm = "yyyy-mm";

Public final static String format_dd_hh_mm_ss = "DD HH:mm:ss";

Public final static String format_hh_mm_ss = "HH:mm:ss";

public static final int use_year = 1;

public static final int use_month = 2;
public static final int use_day = 3; /** * Initializes the date format object according to the corresponding format * @param pattern * @return/public static DateFormat GetdatefoRmat (final String pattern) {Return to New SimpleDateFormat (pattern);}/** * Gets the date from the current date of Nth days, if the days>0 is the current date after a few days, otherwise a few days before * @param days * @return/public static Date Getpreviousornextdaysofnow (int.) {return GETPREVIOUSORNEXTDAYSO
FDate (New Date (), days); /** * Returns the current date in the format of: Format (YYYY-MM-DD) * @return/public static String Getcurrentdate () {Date now = new Date ()
    ;
Return GetDateFormat (FORMAT_YYYY_MM_DD). FORMAT (now); /** * Returns the specified date and the specified format date String * @return/public static string getspecifydate (date date,string pattern) {return GETDA
Teformat (pattern). Format (date);  /** * Returns the current date in the format of: Format (yyyy-mm-dd HH:MM:SS) * @return/public static String GetCurrentDateTime () {Date now
    = new Date ();
Return GetDateFormat (FORMAT_YYYY_MM_DD_HH_MM_SS). FORMAT (now); }/** * Current date with format (YYYY-MM-DD HH:MM:SS:SSS) * @return/public static String Getcurrentdatetimemillisec Ond (date date) {return GetDateFormat (FORMAT_YYYY_MM_DD_HH_MI_SS_SSS). Format (date); /** * Converts to Date * @return/public static date Getdatebytimemillisecond according to the corresponding time format (YYYY-MM-DD HH:MM:SS:SSS) string (String da
    TE) throws parseexception{simpledateformat sdf = new SimpleDateFormat (FORMAT_YYYY_MM_DD_HH_MI_SS_SSS);
return Sdf.parse (date); /** * Converts to date * @return/public static date Getdatebypattern (string date,string pattern) throws Parseex according to the corresponding time format string
    ception{SimpleDateFormat sdf = new SimpleDateFormat (pattern);
return Sdf.parse (date); /** * Get the first day of the month * @return * * * public static Date Getfirstdayofthismonth () {Calendar nowday = calendar.getinstance
    ();
    Nowday.set (Calendar.day_of_month, 1);
    Nowday.set (calendar.hour_of_day, 0);
    Nowday.set (calendar.minute, 0);
    Nowday.set (Calendar.second, 0);
    Nowday.set (Calendar.millisecond, 0);
return Nowday.gettime ();
    /** * Get the current date of the last month date * @return * * * public static date Getlastmonth () {Calendar nowday = calendar.getinstance ();
    Nowday.settime (New Date ()); NowDay.set (Calendar.day_of_month, 1);
    Nowday.add (Calendar.month,-1);
return Nowday.gettime (); public static Date Getlastdaybycalendar (Calendar calendar) {Calendar.set (Calendar.day_of_month, Calendar.getactua
    Lmaximum (Calendar.day_of_month));
return Calendar.gettime (); /** * To determine whether the specified date is within the current N-day * @param old * @param days * @return/public static Boolean isdaysinterval (date old, int
    Days) {The Calendar now = Calendar.getinstance ();
Return (Now.gettimeinmillis ()-Old.gettime ()) <= days * 24 * 3600 * 1000;
    /** * Get the first day of the corresponding month according to calendar * @param calendar * @return/public static Date getfirstdayofthemonth (Calendar calendar) {
    Calendar.set (Calendar.day_of_month, 1);
    Calendar.set (calendar.hour_of_day, 0);
    Calendar.set (calendar.minute, 0);
    Calendar.set (Calendar.second, 0);
    Calendar.set (Calendar.millisecond, 0);
return Calendar.gettime (); /** * Get the date before or after the specified date * @param days * @return/public static date GetpreviousornextdaysoFDate (date date, int days) {Calendar calendar = calendar.getinstance ();
    Calendar.settime (date);
    Calendar.add (Calendar.day_of_year, days);
return Calendar.gettime (); /** * Gets the same date as the number of months from the specified date * @param date * @param month * @return */public static date Getpreviousornextmonthsofdate (date date, int month)
    {Calendar calendar = calendar.getinstance ();
    Calendar.settime (date);
    Calendar.add (Calendar.month, MONTH);
return Calendar.gettime (); /** * Gets the same date as the number of years between the specified dates * @param date * @param month * @return * * * public static date getpreviousornextyearsofdate (D
    Ate date, int year) {Calendar calendar = calendar.getinstance ();
    Calendar.settime (date);
    Calendar.add (Calendar.year, year);
return Calendar.gettime (); 
/** * Gets the start time of the current date * @return/public static date Getbeginofcurrentday () {return getbeginofthedate (new date ()); /** * Gets the end time of the current date * @return/public static date Getendofcurrentday () {return getendofthedate (newDate ()); public static long Getdifferencedays (Calendar begincalender, calendar Endcalendar) {Long days = (Endcalendar.getti
    Meinmillis ()-Begincalender.gettimeinmillis ())/(24 * 60 * 60 * 1000);
    Days = days + 1;
return days; /** * Get the first day of the current year * @return * * * public static Date getbeginofcurrentyear () {Calendar calendar = Calendar.getinsta
    NCE ();
    Calendar.set (calendar.month, 0);
    Calendar.set (Calendar.day_of_month, 1);
    Calendar.set (calendar.hour_of_day, 0);
    Calendar.set (calendar.minute, 0);
    Calendar.set (Calendar.second, 0);
    Calendar.set (Calendar.millisecond, 0);
return Calendar.gettime (); /** * Get the current time before and after n minutes * @param date * @param minute * @return * * public static date getpreviousornextminutesofdate (D
    Ate date, int minute) {Calendar now = calendar.getinstance ();
    Now.settime (date);
    Now.add (Calendar.minute, MINUTE);
return Now.gettime (); /** * Gets the last moment of the specified month * @param date * @return/public static date GetLastDateofthemonth (date date) {Calendar NewDay = calendar.getinstance ();
    Newday.settime (date);
    Newday.set (Calendar.day_of_month, Newday.getactualmaximum (Calendar.day_of_month));
    Newday.set (Calendar.hour_of_day, 23);
    Newday.set (Calendar.minute, 59);
    Newday.set (Calendar.second, 59);
    Newday.set (Calendar.millisecond, 999);
return Newday.gettime ();
    public static date getbeginofthedate (date date) {Calendar nowday = calendar.getinstance ();
    Nowday.settime (date);
    Nowday.set (calendar.hour_of_day, 0);
    Nowday.set (calendar.minute, 0);
    Nowday.set (Calendar.second, 0);
    Nowday.set (Calendar.millisecond, 0);
return Nowday.gettime ();
    public static date getendofthedate (date date) {Calendar nowday = calendar.getinstance ();
    Nowday.settime (date);
    Nowday.set (Calendar.hour_of_day, 23);
    Nowday.set (Calendar.minute, 59);
    Nowday.set (Calendar.second, 59); Nowday.set (Calendar.millisecond, 998);//sql Server BUG return nowday. GetTime (); /** * Gets all the days set for the specified time period * @param begindate * @param enddate * @return * @throws Exception/public static list< String> getareatime (String begindate, String enddate) throws Exception {list<string> timelist = new Arraylis
    T<string> (); if (EndDate = null | |
        "". Equals (EndDate)) {Timelist.add (begindate);
    return timelist;
        }//day if (Begindate.length () <= 7) {return Getareamonthtime (begindate, EndDate);
    Month} else {return getareadaytime (begindate, EndDate); }} private static list<string> Getareamonthtime (String beginmonth, String endmonth) throws Exception {Date PA
    Rsedbeginmonth = GetDateFormat (format_yyyy_mm). Parse (Beginmonth);
    String tempstr = "";
    list<string> timelist = new arraylist<string> ();
    int months = 0; while (!endmonth.equals (TEMPSTR)) {TempStr = GetDateFormat (format_yyyy_mm). FORMAT (Getpreviousornextmonthsofdate (p ARsedbeginmonth, months));
        Timelist.add (TEMPSTR);
    months++;
return timelist; /** * Gets all the days set for the specified time period * @param begindate * @param enddate * @return * @throws Exception/public static list< String> getareadaytime (String begindate, String enddate) throws Exception {Date parsedbeginmonth = GetDateFormat (F
    ORMAT_YYYY_MM_DD). Parse (begindate);
    String tempstr = "";
    list<string> timelist = new arraylist<string> ();
    int months = 0; while (!enddate.equals (TEMPSTR)) {TempStr = GetDateFormat (FORMAT_YYYY_MM_DD). FORMAT (Getpreviousornextdaysofdate (p
        Arsedbeginmonth, months));
        Timelist.add (TEMPSTR);
    months++;
return timelist; /** * Gets the long form of the corresponding date before the current date, such as 20160227 * @return/public static Long Getpreviousday () {Date date = Getpreviouso
    Rnextdaysofdate (New Date (),-1);
Return long.valueof (GetDateFormat (FORMAT_YYYYMMDD). FORMAT (date));
/** * Gets the long form of the corresponding date before the specified date, such as 20160227 * @return */public static Long getpreviousday (date date,int days) {Date dates = Getpreviousornextdaysofdate (date, days);
Return long.valueof (GetDateFormat (FORMAT_YYYYMMDD). FORMAT (dates)); /** * Gets the same date string * @param date * @param n * @return * @throws Exception/public static string GETPR the specified date n months or after n months
    Eviousornextmonthsofthemonth (String date, int n) throws Exception {Calendar calendar = new GregorianCalendar ();
    DateFormat DateFormat = GetDateFormat (FORMAT_YYYYMM);
    Calendar.settime (Dateformat.parse (date));
    Calendar.add (Calendar.month, N);
Return Dateformat.format (Calendar.gettime ()); public static string Getpreviousornextdaysoftheday (String date, int days) throws Exception {Calendar calendar = N
    EW GregorianCalendar ();
    DateFormat DateFormat = GetDateFormat (FORMAT_YYYYMMDD);
    Calendar.settime (Dateformat.parse (date));
    Calendar.add (Calendar.day_of_month, days);
Return Dateformat.format (Calendar.gettime ()); public static Long GetFirstDayofcurrentmonth () {Date date = Getfirstdayofthismonth ();
    String datestr = GetDateFormat (FORMAT_YYYYMMDD). FORMAT (date);
Return long.valueof (DATESTR);
    public static Long Getfirstmonthofnow () {Calendar calendar = calendar.getinstance ();
    Calendar.set (Calendar.day_of_month, 1);
    Calendar.set (calendar.month, 0);
Return long.valueof (GetDateFormat (format_yyyymm). FORMAT (Calendar.gettime ()));
    public static Integer Getcurrentday () {Date date = new Date ();
Return Integer.parseint (GetDateFormat (FORMAT_YYYYMMDD). FORMAT (date));
    public static Integer Getcurrentmonth () {Date date = new Date ();
Return Integer.parseint (GetDateFormat (format_yyyymm). FORMAT (date));
    public static Integer Getcurrentyear () {Date date = new Date ();
Return Integer.parseint (GetDateFormat (format_yyyy). FORMAT (date));
    public static Integer Getkpidbanyoffsetdayofnow (int day) {Calendar nowday = calendar.getinstance (); Nowday.set (Calendar.day_of_year, nowDay.get (calendar.day_of_year) + day);
Return Integer.parseint (GetDateFormat (FORMAT_YYYYMMDD). FORMAT (Nowday.gettime ())); /** * Get current date last month * @return * * public static Long Getpreviousmonthofnextyear () {Calendar nowday = calendar.ge
    Tinstance ();
    Nowday.settime (New Date ());
    Nowday.set (Calendar.day_of_month, 1);
    Nowday.add (Calendar.year, + 1);
    Nowday.add (Calendar.month,-1);
    Long time = long.valueof (GetDateFormat (format_yyyymm). FORMAT (Nowday.gettime ()));
return time; /** * Get the same date as the next month of the specified date * @param date * @return/public static Long Getthesamedayofthenextmonth (date date) {Dat
    E next = getpreviousornextmonthsofdate (date, 1);
    Long time = long.valueof (GetDateFormat (FORMAT_YYYYMMDD). FORMAT (next);
return time; /** * Get the same date for the current date next month * @param date * @return/public static Long Getthesamedayofnextmonth () {return Getthesa
Medayofthenextmonth (New Date ()); public static Long Getpreviousyear () {Calendar nowday = Calendar.getInstance ();
    Nowday.settime (New Date ());
    Nowday.add (Calendar.year,-1);
Return long.valueof (GetDateFormat (format_yyyy). FORMAT (Nowday.gettime ())); public static list<string> Gettimelistbyparameter (Date paramdate, int paramter, int type) {if (type = = Use_y
        EAR) {Date newdate = getpreviousofnextyearofdate (paramdate,-paramter);
    Return Getdaysbetweendate (Paramdate, newdate);
        else if (type = = Use_month) {Date newdate = getpreviousornextmonthsofdate (paramdate, paramter);
    Return Getdaysbetweendate (Paramdate, newdate);
    else {return getdaysbybegindate (paramdate, paramter);
    The private static Date getpreviousofnextyearofdate (date date, int year) {The Calendar now = Calendar.getinstance ();
    Now.settime (date);
    Now.add (calendar.year,year);
return Now.gettime (); private static list<string> getdaysbetweendate (date paramdate, date newdate) {DateFormat DateFormat = Getdat Eformat (FORMAT_YYYYMMDD);
    String formatnewdate = Dateformat.format (newdate);
    String tempstr = "";
    list<string> timelist = new arraylist<string> ();
    int days = 0; while (!formatnewdate.equals (TEMPSTR)) {TempStr = Dateformat.format (Getpreviousornextdaysofdate (paramDate,-days)
        );
        Timelist.add (TEMPSTR);
    days++;
return timelist; private static list<string> Getdaysbybegindate (Date paramdate, int paramter) {list<string> timelist =
    New Arraylist<string> (); for (int i = 1; I <= paramter i++) {Timelist.add (GetDateFormat (FORMAT_YYYYMMDD). FORMAT (Getpreviousornextdayso
    FDate (Paramdate, i));
return timelist;
    public static Long Getfirstmonthofcurrentyear () {Calendar calendar = calendar.getinstance ();
    Calendar.set (calendar.month,0);
Return long.valueof (GetDateFormat (format_yyyymm). FORMAT (Calendar.gettime ()));
 public static date Getpreviousornextmonthsofdatetime (date date, int months) {   Calendar calendar = Calendar.getinstance ();
    Calendar.settime (date);
    Calendar.add (calendar.month, months);
return Calendar.gettime (); /** * Gets the date string of N days before and after the specified date * @param ymd * @param day * @return * @throws parseexception/public static string GE Tpreviousornextdaysofnow (String ymd,int days) throws ParseException {Date date = GetDateFormat (FORMAT_YYYY_MM_DD). par
    SE (YMD);
    Date result = Getpreviousornextdaysofdate (date, days);
Return GetDateFormat (FORMAT_YYYY_MM_DD). FORMAT (result);
    public static Date getbeginofthepreviousornextmonths (int month) {Calendar calendar = calendar.getinstance ();
    Calendar.add (Calendar.month, MONTH);
    Calendar.set (Calendar.day_of_month, 1);
    Calendar.set (calendar.hour_of_day, 0);
    Calendar.set (calendar.minute, 0);
    Calendar.set (Calendar.second, 0);
    Calendar.set (Calendar.millisecond, 0);
return Calendar.gettime (); public static date getpreviousornextworkdaysofdate (date date, int days) {CalenDar Calendar = calendar.getinstance ();
    Calendar.settime (date);
    int step = 0;
    if (days>0) {step = 1;
    }else{step =-1; for (int i = 0; i < Math.Abs (days);)
        {Calendar.add (calendar.day_of_year, step); if (Calendar.get (calendar.day_of_week) ==calendar.saturday| |
        Calendar.get (Calendar.day_of_week) ==calendar.sunday) {continue;
    } i++;
return Calendar.gettime ();
    public static date Getbegindateofthemonth (date date) {Calendar NewDay = calendar.getinstance ();
    Newday.settime (date);
    Newday.set (Calendar.day_of_month, 1);
    Newday.set (calendar.hour_of_day, 0);
    Newday.set (calendar.minute, 0);
    Newday.set (Calendar.second, 0);
    Newday.set (Calendar.millisecond, 0);
return Newday.gettime ();
 }

public static void Main (string[] args) throws Exception {
System.out.println (Getpreviousmonthofnextyear ());
System.out.println (Getpreviousornextdaysofnow (3));
System.out.println (Gettimelistbyparameter (New Date (), 1, 3));
// }

}