Java Tutorial/Development/SimpleDateFormat

Add AM PM to time using SimpleDateFormat

import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] args) {
    Date date = new Date();
    String strDateFormat = "HH:mm:ss a";
    SimpleDateFormat sdf = new SimpleDateFormat(strDateFormat);
    System.out.println(sdf.format(date));
  }
}
//10:20:12 AM

Check if a String is a valid date

import java.text.ParseException;
import java.text.SimpleDateFormat;
public class Main {
  public static boolean isValidDate(String inDate) {
    SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
    dateFormat.setLenient(false);
    try {
      dateFormat.parse(inDate.trim());
    } catch (ParseException pe) {
      return false;
    }
    return true;
  }
  public static void main(String[] args) {
    System.out.println(isValidDate("2004-02-29"));
    System.out.println(isValidDate("2005-02-29"));
  }
}
/*
true
false
*/

Date Formatting and Localization

import java.text.DateFormat;
import java.text.SimpleDateFormat;
public class Main {
  public static void main(String[] args) {
    DateFormat df = DateFormat.getDateInstance();
    if (df instanceof SimpleDateFormat) {
      SimpleDateFormat sdf = (SimpleDateFormat) df;
      System.out.println(sdf.toPattern());
    } else {
      System.out.println("sorry");
    }
  }
}

Format date in dd/mm/yyyy format

import java.util.Date;
import java.text.SimpleDateFormat;
public class Main {
  public static void main(String[] args) {
    Date date = new Date();
    SimpleDateFormat sdf = new SimpleDateFormat("MM/dd/yy");
    String strDate = sdf.format(date);
    System.out.println("formatted date in mm/dd/yy : " + strDate);
    
    sdf = new SimpleDateFormat("dd/MM/yyyy");
    strDate = sdf.format(date);
    System.out.println("formatted date in dd/MM/yyyy : " + strDate);
  }
}

Format date in mm-dd-yyyy hh:mm:ss format

import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] args) {
    Date date = new Date();
    SimpleDateFormat sdf = new SimpleDateFormat("MM/dd/yy");
    String strDate = sdf.format(date);
    System.out.println("formatted date in mm/dd/yy : " + strDate);
    sdf = new SimpleDateFormat("MM-dd-yyyy hh:mm:ss");
    strDate = sdf.format(date);
    System.out.println("formatted date in mm-dd-yyyy hh:mm:ss : " + strDate);
  }
}

Format hour in H (ormat like 0, 1...23.

import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] args) {
    Date date = new Date();
    
    SimpleDateFormat sdf = new SimpleDateFormat("H");
    System.out.println("hour in H format : " + sdf.format(date));
  }
}
//hour in h format : 11

Format hour in h (n AM/PM) format like 1, 2..12.

import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] args) {
    Date date = new Date();
    
    String strDateFormat = "h";
    SimpleDateFormat sdf = new SimpleDateFormat(strDateFormat);
    System.out.println("hour in h format : " + sdf.format(date));
  }
}
//hour in h format : 11

Format hour in HH (ormat like.23.

import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] args) {
    Date date = new Date();
    
    
    SimpleDateFormat sdf = new SimpleDateFormat("HH");
    System.out.println("hour in HH format : " + sdf.format(date));
  }
}
//hour in h format : 11

Format hour in hh (n AM/PM) format like.12.

import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] args) {
    Date date = new Date();
    SimpleDateFormat sdf = new SimpleDateFormat("hh");
    System.out.println("hour in hh format : " + sdf.format(date));
  }
}
//hour in h format : 11

Format hour in K (n AM/PM) format like 0, 1..11.

import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] args) {
    Date date = new Date();
    
    
    SimpleDateFormat sdf = new SimpleDateFormat("K");
    System.out.println("hour in K format : " + sdf.format(date));
  }
}
//hour in h format : 11

Format hour in k (ormat like 1, 2..24.

import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] args) {
    Date date = new Date();
    
    SimpleDateFormat sdf = new SimpleDateFormat("k");
    System.out.println("hour in k format : " + sdf.format(date));
  }
}
//hour in h format : 11

Format hour in KK (ormat like..11.

import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] args) {
    Date date = new Date();
    
    SimpleDateFormat sdf = new SimpleDateFormat("KK");
    System.out.println("hour in KK format : " + sdf.format(date));
  }
}
// hour in h format : 11

Format hour in kk (ormat like.24.

import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] args) {
    Date date = new Date();
    
    SimpleDateFormat sdf = new SimpleDateFormat("kk");
    System.out.println("hour in kk format : " + sdf.format(date));
  }
}
//hour in h format : 11

Format minutes in mm format liketc.

import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] args) {
    Date date = new Date();
    
    SimpleDateFormat sdf = new SimpleDateFormat("mm");
    System.out.println("minutes in mm format : " + sdf.format(date));
  }
}
// minutes in m format : 35

Format month in M format like 1,2 etc

import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] args) {
    Date date = new Date();
    
    SimpleDateFormat sdf = new SimpleDateFormat("M");
    System.out.println("Current Month in M format : " + sdf.format(date));
  }
}
//Current Month in M format : 2

Format Month in MM format liketc.

import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] args) {
    Date date = new Date();

    SimpleDateFormat  sdf = new SimpleDateFormat("MM");
    System.out.println("Current Month in MM format : " + sdf.format(date));  }
}
//Current Month in M format : 02

Format Month in MMM format like Jan, Feb etc.

import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] args) {
    Date date = new Date();
    SimpleDateFormat sdf = new SimpleDateFormat("MMM");
    System.out.println("Current Month in MMM format : " + sdf.format(date));
    }
}
//Current Month in MMM format : Feb

Format Month in MMMM format like January, February etc.

import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] args) {
    Date date = new Date();
    
    SimpleDateFormat sdf = new SimpleDateFormat("MMMM");
    System.out.println("Current Month in MMMM format : " + sdf.format(date));
    
    }
}
//Current Month in MMMM format : February

Format seconds in s format like 1,2 etc.

import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] args) {
    Date date = new Date();
    
    SimpleDateFormat sdf = new SimpleDateFormat("s");
    System.out.println("seconds in s format : " + sdf.format(date));
  }
}
//seconds in s format : 40

Format seconds in ss format liketc.

import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] args) {
    Date date = new Date();

    SimpleDateFormat sdf = new SimpleDateFormat("ss");
    System.out.println("seconds in ss format : " + sdf.format(date));
  }
}
//seconds in ss format : 14

Format TimeZone in z (General time zone) format like EST.

import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] args) {
    Date date = new Date();

    SimpleDateFormat sdf = new SimpleDateFormat("zzz");
    System.out.println("TimeZone in z format : " + sdf.format(date));
  }
}
//TimeZone in z format : PST

Format TimeZone in Z (RFC ormat like -8000.

import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] args) {
    Date date = new Date();
    
    SimpleDateFormat sdf = new SimpleDateFormat("Z");
    System.out.println("TimeZone in Z format : " + sdf.format(date));
  }
}
//TimeZone in Z format : -0800

Format TimeZone in zzzz format Eastern Standard Time.

import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] args) {
    Date date = new Date();
    SimpleDateFormat sdf = new SimpleDateFormat("zzzz");
    System.out.println("TimeZone in zzzz format : " + sdf.format(date));
  }
}
//TimeZone in zzzz format : Pacific Standard Time

Formatting a Date Using a Custom Format

import java.text.Format;
import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] argv) throws Exception {
    Format formatter = new SimpleDateFormat("yy");
    String s = formatter.format(new Date());
    System.out.println(s);
  }
}

Formatting date with full day and month name and show time up to milliseconds with AM/PM

import java.text.Format;
import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] argv) throws Exception {
    Format formatter = new SimpleDateFormat("EEEE, dd MMMM yyyy, hh:mm:ss.SSS a");
    String today = formatter.format(new Date());
    System.out.println("Today : " + today);
  }
}

Formatting day in dd format liketc.

import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] args) {
    String strDateFormat = "dd";
    SimpleDateFormat sdf = new SimpleDateFormat(strDateFormat);
    System.out.println("Current day in dd format : " + sdf.format(new Date()));
  }
}

Formatting day in d format like 1,2 etc

import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] args) {
    Date date = new Date();
    String strDateFormat = "d";
    SimpleDateFormat sdf = new SimpleDateFormat(strDateFormat);
    System.out.println("Current day in d format : " + sdf.format(date));
  }
}

Formatting day of week in EEEE format like Sunday, Monday etc.

import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] args) {
    
    String strDateFormat = "EEEE";
    SimpleDateFormat sdf = new SimpleDateFormat(strDateFormat);
    System.out.println("Current day of week in EEEE format : " + sdf.format(new Date()));
  }
}

Formatting day of week using SimpleDateFormat

//Formatting day of week in E format like Sun, Mon etc.
import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] args) {
    Date date = new Date();
    String strDateFormat = "E";
    SimpleDateFormat sdf = new SimpleDateFormat(strDateFormat);
    System.out.println("Current day of week in E format : " + sdf.format(date));
  }
}

Formatting minute in m format like 1,2 etc.

import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] args) {
    Date date = new Date();
    
    SimpleDateFormat sdf = new SimpleDateFormat("m");
    System.out.println("minutes in m format : " + sdf.format(date));

  }
}
//minutes in m format : 35

Format year in yy format liketc

import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] args) {
    Date date = new Date();
    SimpleDateFormat sdf = new SimpleDateFormat("yy");
    System.out.println("Current year in yy format : " + sdf.format(date));
  }
}
//Current year in yy format : 09

Format year in yyyy format like etc.

import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] args) {
    Date date = new Date();
    SimpleDateFormat sdf = new SimpleDateFormat("yyyy");
    System.out.println("Current year in yyyy format : " + sdf.format(date));
  }
}
//Current year in yyyy format : 2009

Full day name: SimpleDateFormat("EEEE")

import java.text.Format;
import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] argv) throws Exception {
    Format formatter = new SimpleDateFormat("EEEE"); 
    String s = formatter.format(new Date());
    System.out.println(s);
  }
}

Full length of month name: SimpleDateFormat("MMMM")

import java.text.Format;
import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] argv) throws Exception {
    Format formatter = new SimpleDateFormat("MMMM"); 
    String s = formatter.format(new Date());
    System.out.println(s);
  }
}

Get Today"s Date

import java.text.SimpleDateFormat;
import java.util.Calendar;
public class Main {
  public static void main(String[] args) throws Exception {
    Calendar calendar = Calendar.getInstance();
    SimpleDateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy");
    System.out.println(dateFormat.format(calendar.getTime()));
  }
}
//17/02/2009

new SimpleDateFormat("a"): The am/pm marker

import java.text.Format;
import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] argv) throws Exception {
    Format formatter = new SimpleDateFormat("a"); 
    String s = formatter.format(new Date());
    System.out.println(s);
  }
}

new SimpleDateFormat("hh")

import java.text.Format;
import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] argv) throws Exception {
    Format formatter = new SimpleDateFormat("hh");
    String s = formatter.format(new Date());
    System.out.println(s);
  }
}

new SimpleDateFormat("HH.mm.ss")

import java.text.Format;
import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] argv) throws Exception {
    Format formatter = new SimpleDateFormat("HH.mm.ss");
    String s = formatter.format(new Date());
    System.out.println(s);
  }
}

new SimpleDateFormat("hh:mm:ss a")

import java.text.Format;
import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] argv) throws Exception {
    Date date = new Date();
    Format formatter = new SimpleDateFormat("hh:mm:ss a");
    String s = formatter.format(date);
    System.out.println(s);
  }
}

new SimpleDateFormat("HH:mm:ss Z")

import java.text.Format;
import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] argv) throws Exception {
    Format formatter = new SimpleDateFormat("HH:mm:ss Z");
    Date date = (Date) formatter.parseObject("22:14:02 -0500");
    System.out.println(date);
  }
}

new SimpleDateFormat("H") // The hour (0-23)

import java.text.Format;
import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] argv) throws Exception {
    Format formatter = new SimpleDateFormat("H");
    String s = formatter.format(new Date());
    System.out.println(s);
  }
}

new SimpleDateFormat("mm")

import java.text.Format;
import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] argv) throws Exception {
    Format formatter = new SimpleDateFormat("mm");
    String s = formatter.format(new Date());
    System.out.println(s);
  }
}

new SimpleDateFormat("m"): The minutes

import java.text.Format;
import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] argv) throws Exception {
    Format formatter = new SimpleDateFormat("m");
    String s = formatter.format(new Date());
    System.out.println(s);
  }
}

new SimpleDateFormat("ss")

import java.text.Format;
import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] argv) throws Exception {
    Format formatter = new SimpleDateFormat("ss");
    String s = formatter.format(new Date());
    System.out.println(s);
  }
}

new SimpleDateFormat("s"): The seconds

import java.text.Format;
import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] argv) throws Exception {
    Format formatter = new SimpleDateFormat("s"); 
    String s = formatter.format(new Date());
    System.out.println(s);
  }
}

new SimpleDateFormat("Z")

import java.text.Format;
import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] argv) throws Exception {
    Format formatter = new SimpleDateFormat("Z"); 
    String s = formatter.format(new Date());
    System.out.println(s);
  }
}

new SimpleDateFormat("z"): The time zone

import java.text.Format;
import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] argv) throws Exception {
    Format formatter = new SimpleDateFormat("z"); 
    String s = formatter.format(new Date());
    System.out.println(s);
  }
}

new SimpleDateFormat("zzzz")

import java.text.Format;
import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] argv) throws Exception {
    Format formatter = new SimpleDateFormat("zzzz"); 
    String s = formatter.format(new Date());
    System.out.println(s);
  }
}

Parsing custom formatted date string into Date object using SimpleDateFormat

import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] args) throws Exception {
    SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yy");
    Date date = sdf.parse("31/12/06");
    System.out.println(date);
  }
}
//Sun Dec 31 00:00:00 PST 2006

SimpleDateFormat("dd-MMM-yy")

import java.text.Format;
import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] argv) throws Exception {
    Format formatter = new SimpleDateFormat("dd-MMM-yy");
    String s = formatter.format(new Date());
    System.out.println(s);
  }
}

SimpleDateFormat("E, dd MMM yyyy HH:mm:ss Z")

import java.text.Format;
import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] argv) throws Exception {
    Format formatter = new SimpleDateFormat("E, dd MMM yyyy HH:mm:ss Z");
    String s = formatter.format(new Date());
  }
}

SimpleDateFormat("MM/dd/yy")

import java.text.Format;
import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] argv) throws Exception {
    Date date = new Date();
    Format formatter = new SimpleDateFormat("MM/dd/yy");
    String s = formatter.format(date);
    System.out.println(s);
  }
}

SimpleDateFormat("MM"): number based month value

import java.text.Format;
import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] argv) throws Exception {
    Format formatter = new SimpleDateFormat("MM");
    String s = formatter.format(new Date());
    System.out.println(s);
  }
}

SimpleDateFormat("yyyy")

import java.text.Format;
import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] argv) throws Exception {
    Format formatter = new SimpleDateFormat("yyyy"); 
    String s = formatter.format(new Date());
    System.out.println(s);
  }
}

The day in week: SimpleDateFormat("E")

import java.text.Format;
import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] argv) throws Exception {
    Format formatter = new SimpleDateFormat("E"); 
    String s = formatter.format(new Date());
    System.out.println(s);
  }
}

The day number: SimpleDateFormat("d")

import java.text.Format;
import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] argv) throws Exception {
    Format formatter = new SimpleDateFormat("d"); 
    String s = formatter.format(new Date());
    System.out.println(s);
  }
}

The month: SimpleDateFormat("M")

import java.text.Format;
import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] argv) throws Exception {
    Format formatter = new SimpleDateFormat("M"); 
    String s = formatter.format(new Date());
    System.out.println(s);
  }
}

Three letter-month value: SimpleDateFormat("MMM")

import java.text.Format;
import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] argv) throws Exception {
    Format formatter = new SimpleDateFormat("MMM");
    String s = formatter.format(new Date());
    System.out.println(s);
  }
}

Two digits day number: SimpleDateFormat("dd")

import java.text.Format;
import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
  public static void main(String[] argv) throws Exception {
    Format formatter = new SimpleDateFormat("dd");
    String s = formatter.format(new Date());
    System.out.println(s);
  }
}