Java Time Date Format Tool class program

Example 1. Organize a reusable date formatting tool class that is not necessary for programmers who are miserable in daily development
Here's how to contribute to the Java Date Tool class code:

The code is as follows

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/** * Date Tool class-www.111cn.net network finishing * The default use of the "YYYY-MM-DD HH:mm:ss" format date * @author XW Material Network */ Public final class Dateutils { /** * English abbreviation (default) such as: 2010-12-01 */ public static String Format_short = "YYYY-MM-DD"; /** * English full name: 2010-12-01 23:15:06 */ public static String Format_long = "Yyyy-mm-dd HH:mm:ss"; /** * Accurate to millisecond full time such as: Yyyy-mm-dd HH:mm:ss. S */ public static String Format_full = "Yyyy-mm-dd HH:mm:ss. S "; /** * Chinese abbreviation: December 01, 2010 */ public static String FORMAT_SHORT_CN = "yyyy year mm month DD"; /** * Chinese Full name: December 01, 2010 23:15 06 seconds */ public static String FORMAT_LONG_CN = "yyyy mm month DD Day hh when the minute of SS seconds"; /** * Accurate to millisecond full Chinese time */ public static String FORMAT_FULL_CN = "yyyy mm month DD Day hh when the minute is SS seconds sss milliseconds"; /** * Get the default date pattern */ public static String Getdatepattern () { return format_long; } /** * Return current date according to preset format * @return */ public static String Getnow () { Return format (new Date ()); } /** * Return current date according to user format * @param format * @return */ public static string Getnow (string format) { Return format (new Date (), format); } /** * Format dates with preset formatting * @param date * @return */ public static String format (date date) { return format (date, Getdatepattern ()); } /** * Format dates with user format * @param date * @param pattern Date format * @return */ public static string format (date date, String pattern) { String returnvalue = ""; if (date!= null) { SimpleDateFormat df = new SimpleDateFormat (pattern); returnvalue = Df.format (date); } return (returnvalue); } /** * Extract string date using preset format * @param strdate Date string * @return */ public static Date Parse (String strdate) { Return Parse (strdate, Getdatepattern ()); } /** * Extract string date using user format * @param strdate Date string * @param pattern Date format * @return */ public static Date Parse (string strdate, string pattern) { SimpleDateFormat df = new SimpleDateFormat (pattern); try { Return Df.parse (strdate); catch (ParseException e) { E.printstacktrace (); return null; } } /** * Add a few month to the date * @param date * @param n to increase the number of months * @return */ public static date Addmonth (date date, int n) { Calendar cal = Calendar.getinstance (); Cal.settime (date); Cal.add (Calendar.month, N); return Cal.gettime (); } /** * Increase the number of days on the date * @param date * @param n to increase the number of days * @return */ public static date Addday (date date, int n) { Calendar cal = Calendar.getinstance (); Cal.settime (date); Cal.add (calendar.date, N); return Cal.gettime (); } /** * Get time stamp */ public static String gettimestring () { SimpleDateFormat df = new SimpleDateFormat (format_full); Calendar calendar = Calendar.getinstance (); Return Df.format (Calendar.gettime ()); } /** * Get date year * @param date * @return */ public static String getyear (date date) { return format (date). substring (0, 4); } /** * By default format string distance today's number of days * @param date string * @return */ public static int countdays (String date) { Long T = calendar.getinstance (). GetTime (). GetTime (); Calendar C = calendar.getinstance (); C.settime (Parse (date)); Long T1 = C.gettime (). GetTime (); return (int) (t/1000-t1/1000)/3600/24; } /** * by user format string distance today's days * @param date string * @param format Date * @return */ public static int Countdays (string date, string format) { Long T = calendar.getinstance (). GetTime (). GetTime (); Calendar C = calendar.getinstance (); C.settime (Parse (date, format)); Long T1 = C.gettime (). GetTime (); return (int) (t/1000-t1/1000)/3600/24; } }

Example 2. Not only has the above function, but also contains the commonly used date formatting method

The code is as follows

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Package com.util; Import Java.sql.Timestamp; Import Java.text.DateFormat; Import java.text.ParseException; Import Java.text.SimpleDateFormat; Import Java.util.Calendar; Import Java.util.Date; Public class Commondateparseutil {  public static final String Eng_date_fromat = "EEE, d MMM yyyy z";  public static final String yyyy_mm_dd_hh_mm_ss = "Yyyy-mm-dd HH:mm:ss";  public static final String yyyy_mm_dd_hh_mm = "Yyyy-mm-dd hh:mm";  public static final String yyyy_mm_dd = "YYYY-MM-DD";  public static final String YYYY = "YYYY";  public static final String mm = "mm";  public static final String dd = "DD";  /**   * @param date   * @return   * @ author Wang jianming   * @ creation Date 2012-7-13   * @ Create Time 12:22:40   * Description--Format Date Object   */  public static date date2date (date date, String format STR) {   simpledateformat SDF = new SimpleDateFormat (FORMATSTR);   string str = Sdf.format ( Date);   try {    date = sdf.parse (str);   } catch (Exception e) {  &nb Sp; return null;   }   return date;  } /** * @param date * @return * @ Author Wang Jianming * @ Creation Date 2012-7-13 * @ creation Time 12:24:19 * Description--time object converted to string */ public static string date2string (date date, String formatstr) { String strdate = ""; SimpleDateFormat SDF = new SimpleDateFormat (FORMATSTR); Strdate = Sdf.format (date); return strdate; } /** * @param date * @return * @ Author Wang Jianming * @ Creation Date 2012-7-13 * @ creation Time 12:24:19 * @ Description--sql Time object converted to string */ public static string timestamp2string (Timestamp Timestamp, string formatstr) { String strdate = ""; SimpleDateFormat SDF = new SimpleDateFormat (FORMATSTR); Strdate = Sdf.format (timestamp); return strdate; }  /**   * @param datestring   * @param formatstr   * @return   * @ author Wang jianming &n Bsp * @ Creation Date 2012-7-13   * @ creation time 1:09:24   * @ Description--string converted to time object   */  public static Date s Tring2date (String datestring, String formatstr) {   date formatedate = null;   dateformat format = new SimpleDateFormat (FORMATSTR);   try {    formatedate = Format.parse (datestring);   } catch ( ParseException e) {    return null;   }   return formatedate;  .} /** * @param date * @return * @ Author Wang Jianming * @ Creation Date 2012-10-10 * @ creation Time 09:18:36 * @ description--date type conversion to timestamp type */ public static Timestamp Date2timestamp (date date) { if (date = null) return null; return new Timestamp (Date.gettime ()); } /** * @return * @ Author Wang Jianming * @ Creation Date 2012-9-13 * @ creation Time 05:02:57 * Description--Get current year */ public static String Getnowyear () { SimpleDateFormat SDF = new SimpleDateFormat (YYYY); Return Sdf.format (New Date ()); }  /**   * @return   * @ author Wang jianming   * @ creation Date 2012-9-13   * @ creation time PM 05:03:15 &nbs P * @ Description--get current month   */  public static String Getnowmonth () {   simpledateformat sdf = new Si Mpledateformat (MM);   return Sdf.format (New Date ());  }    /**   * @return   * @ author Wang jianming   * @ creation Date 2013-01-24   * @ creation time 08:41 :   * @ description--Get day in current date   */  public static String Getnowday () {   simpledateform At SDF = new SimpleDateFormat (DD);   return Sdf.format (New Date ());  }  /**   * @param time   * @return   * @ author Wang jianming   * @ creation Date 2012-6-17   * @ creation Time 10:19:31   * @ description--Chinese information for specified time distance at current time   */  public static String Getlnow (long time) {   calendar cal = Calendar.getinstance ();   long Timel = Cal.gettimeinmillis ()-time;   if (timel/1000 <) {    return "within 1 minutes";   } else if (timel/1000 {<) {    return timel/1000/60 + minutes ago;   } else if (timel/1000/60/60 <) {    return timel/1000/60/60 + hours ago;   } else {    re Turn timel/1000/60/60/24 + "days ago";   }  } }