Java Tools Class Dateutils examples

Source: Internet
Author: User
Tags dateformat string format

The example of this article for you to share the Java tool class Dateutils specific code for your reference, the specific content as follows

Import Java.text.parseexception;import java.text.simpledateformat;import Java.util.calendar;import java.util.Date  ;/** * Description: Common Date Tool Class */public class Dateutils {public static String Date_format = "YYYY-MM-DD";  public static String Date_time_format = "Yyyy-mm-dd HH:mm:ss";  public static String Date_format_chinese = "yyyy year m D Day";    /** * Get Current date * * * @return * */public static string Getcurrentdate () {string datestr = null;    SimpleDateFormat df = new SimpleDateFormat (Dateutils.date_format);    Datestr = Df.format (New Date ());  return datestr;     }/** * Gets the current datetime * * * @return * */public static string GetCurrentDateTime () {string datestr = null;    SimpleDateFormat df = new SimpleDateFormat (Dateutils.date_time_format);    Datestr = Df.format (New Date ());  return datestr; }/** * Gets the current datetime * * * @return * */public static string GetCurrentDateTime (String dateformat) {Strin    G datestr = null; SimpleDateFormat df = new simpledAteformat (DateFormat);    Datestr = Df.format (New Date ());  return datestr;    public static string Datetodatetime (date date) {string datestr = null;    SimpleDateFormat df = new SimpleDateFormat (Dateutils.date_time_format);    Datestr = Df.format (date);  return datestr; /** * Convert string date to date format * * * @param datestr * @return * */public static date Stringtodate (String datest R) {if (Datestr ==null | |      Datestr.equals ("")) {return null;    } Date Date = new Date ();    SimpleDateFormat df = new SimpleDateFormat (Dateutils.date_format);    try {date = Df.parse (DATESTR);    } catch (ParseException e) {date=dateutils.stringtodate (datestr, "yyyyMMdd");  } return date; /** * Convert string date to date format * Custom format * * @param datestr * @return * * * public static date stringtodate (String d    Atestr, String dateformat) {Date date = new Date ();    SimpleDateFormat df = new SimpleDateFormat (DateFormat); try {date = Df.parse (datestR);    } catch (ParseException e) {e.printstacktrace ();  } return date;     /** * Convert date format date to string format * * * @param date * @return * */public static string datetostring (date date) {    String datestr = null;    SimpleDateFormat df = new SimpleDateFormat (Dateutils.date_format);    Datestr = Df.format (date);  return datestr; /** * Convert date format date to string format custom format * * @param date * @param dateformat * @return */public static string Datetos    Tring (date date, string dateformat) {string datestr = null;    SimpleDateFormat df = new SimpleDateFormat (DateFormat);    Datestr = Df.format (date);  return datestr; /** * Gets the day value of the date * * * @param date * Enter Date * @return * */public static int getdayofdate (Date da    TE) {int d = 0;    Calendar cd = Calendar.getinstance ();    Cd.settime (date);    D = Cd.get (Calendar.day_of_month);  return D; }/** * Gets the month value of the date * * * @param date * Enter Date * @return * */Public STATIC int getmonthofdate (date date) {int m = 0;    Calendar cd = Calendar.getinstance ();    Cd.settime (date);    m = Cd.get (calendar.month) + 1;  return m; /** * Gets the year value of the date * * * @param date * Enter Date * @return * */public static int getyearofdate (date    date) {int y = 0;    Calendar cd = Calendar.getinstance ();    Cd.settime (date);    y = Cd.get (calendar.year);  return y;  /** * Get Day of the week * * * @param date * Enter Date * @return * */public static int getweekofdate (date date)    {int WD = 0;    Calendar cd = Calendar.getinstance ();    Cd.settime (date);    WD = Cd.get (Calendar.day_of_week)-1;  return WD; }/** * Gets the first day of the month entered date * * * @param date * Enter Date * @return * */public static date Getfirstdayofmon    Th (date date) {Calendar cd = Calendar.getinstance ();    Cd.settime (date);    Cd.set (Calendar.day_of_month, 1);  return Cd.gettime (); }/** * Gets the last day of the month entered date * * @param date */public static DaTe getlastdayofmonth (date date) {return Dateutils.addday (Dateutils.getfirstdayofmonth (Dateutils.addmonth (date, 1)),  -1); }/** * To determine if it is a leap year * * * @param date * Enter Date * @return is true no false * */public static Boolean Islea    Pyear (date date) {Calendar cd = Calendar.getinstance ();    Cd.settime (date);    int year = Cd.get (calendar.year);    if (year% 4 = = 0 && year%! = 0 | year% = = 0) {return true;    } else {return false;   }}/** * Generates a date type format based on the number of integers represented by the integer type * * @param year * @param month * month * @param days * Day * @return * */public static Date Getdatebyymd (int year, int month, Int. day) {Calendar cd = Calendar.getinstanc    E ();    Cd.set (year, month-1, day);  return Cd.gettime (); }/** * Gets the year cycle corresponding day * * @param date * Input date * @param iyear * years negative number before * @return * */Public Static date getyearcycleofdate (date date, int iyear) {Calendar cd = Calendar.getinStance ();    Cd.settime (date);    Cd.add (Calendar.year, iyear);  return Cd.gettime (); /** * Get month cycle corresponding Day * * @param date * Enter Date * @param i * @return * */public static date Getmonthcycl    Eofdate (date date, int i) {Calendar cd = Calendar.getinstance ();    Cd.settime (date);    Cd.add (Calendar.month, i);  return Cd.gettime (); }/** * Calculates the difference in FromDate to toDate years * * @param fromdate * @param toDate * @return Years * */public static I    NT Getyearbyminusdate (date fromdate, date toDate) {Calendar df=calendar.getinstance ();    Df.settime (FromDate);    Calendar dt=calendar.getinstance ();    Dt.settime (toDate);  Return Dt.get (calendar.year)-df.get (calendar.year); }/** * Calculates how many months difference fromdate to toDate * * @param fromdate * @param toDate * @return months * */public static    int getmonthbyminusdate (date fromdate, date toDate) {Calendar df=calendar.getinstance ();    Df.settime (FromDate);    Calendar dt=calendar.getinstance (); Dt.setTime (toDate);  Return Dt.get (calendar.year) *12+dt.get (calendar.month)-(Df.get (calendar.year) *12+df.get (calendar.month)); }/** * Calculates the difference in fromdate to toDate days * * @param fromdate * @param toDate * @return Days * */public static L    Ong getdaybyminusdate (Object FromDate, Object toDate) {Date f=dateutils.chgobject (fromdate);    Date T=dateutils.chgobject (toDate);    Long Fd=f.gettime ();    Long Td=t.gettime ();  Return (TD-FD)/(24L * 60L * 60L * 1000L); /** * Calculate Age * * @param birthday * Birthday Date * @param calcdate * Date point to calculate * @return * */Public    static int calcage (date birthday, date calcdate) {int cyear=dateutils.getyearofdate (calcdate);    int cmonth=dateutils.getmonthofdate (calcdate);       int cday=dateutils.getdayofdate (calcdate);    int byear=dateutils.getyearofdate (birthday);    int bmonth=dateutils.getmonthofdate (birthday);    int bday=dateutils.getdayofdate (birthday); if (cmonth>bmonth| | (CMONTH==BMONTH&&CDAY>bday)) {return cyear-byear;    }else{return cyear-1-byear; }}/** * Get birth date from ID * * @param idno * ID Number * @return * */public static String Getbirthdayfromi    Dcard (String idno) {Calendar cd = Calendar.getinstance ();      if (idno.length () = =) {Cd.set (Calendar.year, integer.valueof ("+" + idno.substring (6, 8)). Intvalue ());      Cd.set (Calendar.month, Integer.valueof (idno.substring (8)). Intvalue ()-1);    Cd.set (Calendar.day_of_month, integer.valueof (Idno.substring (Ten)). Intvalue ());       } else if (idno.length () = =) {Cd.set (Calendar.year, Integer.valueof (idno.substring (6)). Intvalue ());      Cd.set (Calendar.month, integer.valueof (Idno.substring (Ten)). Intvalue ()-1);    Cd.set (Calendar.day_of_month, Integer.valueof (idno.substring ()). Intvalue ());  } return Dateutils.datetostring (Cd.gettime ()); /** * Add (+) or subtract (-) days on Input date * * @param datE * Enter Date * @param imonth * Number of days to increase or decrease */public static date Addday (date date, int iday) {Calendar CD    = Calendar.getinstance ();    Cd.settime (date);    Cd.add (Calendar.day_of_month, iday);  return Cd.gettime (); /** * Add (+) or subtract (-) month on input date * * @param date * Enter Date * @param imonth * Month score to increase or decrease */public Stati    C Date Addmonth (date date, int imonth) {Calendar cd = Calendar.getinstance ();    Cd.settime (date);    Cd.add (Calendar.month, imonth);  return Cd.gettime ();  /** * Increase (+) or subtract (-) year on input date * * @param date * Enter Date * @param imonth * Number of years to increase or decrease */public static    Date Addyear (date date, int iyear) {Calendar cd = Calendar.getinstance ();    Cd.settime (date);    Cd.add (Calendar.year, iyear);  return Cd.gettime (); }/** * Transforms the Object type to date * @param date * @return */public static date Chgobject (object date) {if (date!=null&    Amp;&date instanceof Date) {return (date) date; } if (date!=null&Amp;&date instanceof String) {return dateutils.stringtodate ((String) date);  } return null;    public static long Getagebybirthday (String date) {Date birthday = Stringtodate (date, "Yyyy-mm-dd");    Long sec = new Date (). GetTime ()-birthday.gettime ();    Long age = sec/(1000*60*60*24)/365;  return age; }/** * @param args */public static void main (string[] args) {//string temp = dateutil.datetostring (getlastdayo    Fmonth (New Date ()),///Dateutil.date_format_chinese);    String s=dateutil.datetostring (Dateutil.addday (Dateutil.addyear (New Date (), 1),-1));    Long S=dateutils.getdaybyminusdate ("2012-01-01", "2012-12-31");  System.err.println (s); }}
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Java Tools Class Dateutils examples

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