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  • Date class In Java: Formatting dates in java


    In this blog, we will learn about the date class of the java, customizing the date formats along with the example programs, with this table of content…
    Date Class in java
    Constructors of the date class
    Methods of the date class
    Formatting dates with the DateFormat class
    Converting date to a string in java
    Formatting dates with SimpleDateFormat class
    Converting a string to date in java
    Formatting dates with DateTimeFormatter class
    Converting date to custom format with off pattern() method
    Let us start with understanding the Date class and Date objects in java

    Date Class in java

    Date in java can be represented as an object of the class, Date, which is present at the java.util package implementing the comparable interface, serializable interface, and cloneable interface.

    There are methods and constructors available to customize the data and time in java. Constructors of the date class
    Date(): Creates an instance of the Date Class for representing the current date and time.
    Date(long milliseconds): Creates an instance of the Date Class for the given milliseconds.
    Let us now see these constructors in action, by implementing them in an example program.
    // Java program for demonstrating the constructors of the Date Class import java.util.*;   public class Main { public static void main(String[] args) { Date dt1 = new Date(); System.out.println(“Today’s date is ” + dt1); Date dt2 = new Date(2323223233L); System.out.println(“GIven data is represented as ” + dt2); } }
    Output for the above program will be
    Today’s date is Fri Oct 09 13:27:13 UTC 2020 GIven data is represented as Tue Jan 27 21:20:23 UTC 1970
    Methods of the date class
    boolean after(Date date): Checks for the given date is earlier than the current data.
    boolean before(Date date): Checks for the given date if it comes after the current data.
    int compareTo(Date date): Compares the given date with the current date.
    Returns 0, if the passed Date is equal to the  Date object.
    A positive value, if the passed Date comes before the  Date object.
    A negative value, if the passed Date comes after the  Date object.
    void setTime(long time): Changes the current date and time to a given time.
    Let us now see these methods in action, by implementing them in an example program.
    // Example program for demonstrating methods of Date class import java.util.*;   public class Main { public static void main(String[] args) { // Creating dates Date dt1 = new Date(2003, 12, 22); Date dt2 = new Date();            // Today’s date Date dt3 = new Date(2010, 12, 7);   boolean afr = dt1.after(dt2); System.out.println(“Date 2003/12/22 comes after ” + “today’s date: ” + afr);   boolean bfr = dt2.before(dt3); System.out.println(“Today’s date comes before ” + “date 2010/12/7: ” + bfr);   int com = dt3.compareTo(dt2); System.out.println(com);   System.out.println(” Date Before setting: ” + dt2); dt2.setTime(204587433443L); System.out.println(“Date After setting with setTime: ” + dt2); } }
    Output for the above program will be
    Date 2003/12/22 comes after today’s date: true Today’s date comes before date 2010/12/7: true 1 Date Before setting: Fri Oct 09 13:38:52 UTC 2020 Date After setting with setTime: Fri Jun 25 21:50:33 UTC 1976

    Now customizing these date formats will require us to use the DateFormat class, the SimpleDateFormat class, or the offpattern() method of the DateTimeFormatter class. So let us see each of them one by one in the following sequence

    Formatting dates with the DateFormat class.
    Formatting dates with SimpleDateFormat class.
    Formatting dates with DateTimeFormatter class.
    Let us format dates with each of these classes, starting with the DateFormat class.

    Formatting dates with the DateFormat class in java

    The DateFormat class is an asynchronous class,  present at java.text.DateFormat.This class provides various methods to format dates and also to parse the dates to a String.

    Let us see an example for implementing the DateFormat class. Converting Date to a String in java Let use the DateFormat class, for converting a given date to a string.
    // Example Program to format date with the DateFormat class import java.util.*; import java.text.*; import java.util.Calendar;   public class Main { public static void main(String[] args) {   DateFormat Date = DateFormat.getDateInstance();// date formatter   Calendar cal = Calendar.getInstance(); // calender object   System.out.println(“The actual Date: ” + cal.getTime());   // Using format() method of DateFormat for converting date to string String ForD = Date.format(cal.getTime()); System.out.println(“Formatted Date: ” + ForD); } }
    Output for the above program
    The actual Date: Fri Oct 09 13:55:28 UTC 2020 Formatted Date: Oct 9, 2020
    After learning to format dates with the DateFormat class, let us now learn to format dates with the SimpleDateFormat class in java.

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    Formatting dates with the SimpleDateFormat class in java

    This is the child class of DateFormat class which takes a String argument that should specify the pattern or formatting pattern of the date. The years should be represented by ‘yyyy’,  month by ‘MM’ and the date by ‘dd’. Let us implement the SimpleDateFormat class with an example program.

    Converting String to a Date in java

    // Example Program to format date with the DateFormat class import java.util.*; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Date;   public class Main { public static void main(String[] args) { String pattern = “dd/MM/yyyy”; SimpleDateFormat DateFor = new SimpleDateFormat(pattern); try { Date date = DateFor.parse(“20/05/2016”); System.out.println(“Date : ” + date); } catch (ParseException e) { e.printStackTrace(); } } }
    Output for the above program
    Date : Fri May 20 00:00:00 UTC 2016
    After learning to format dates with the SimpleDateFormat class, let us now learn to format dates with the DateTimeFormatter class in java.

    Formatting dates with DateTimeFormatter class in java

    The ofpattern() method of the DateTimeFormatter class can be used on LocalDateTime instance, to format or parse the date or time object of the class.
    // Example Program to format date with the DateTimeFormatter class import java.util.*; import java.time.LocalDateTime; import java.time.format.DateTimeFormatter;   public class Main { public static void main(String[] args) { LocalDateTime dtobj = LocalDateTime.now(); System.out.println(“Date before formatting: ” + dtobj); DateTimeFormatter myFormatObj = DateTimeFormatter.ofPattern(“dd-MM-yyyy, HH-mm-ss”);   String fdt = dtobj.format(myFormatObj); System.out.println(“Date after formatting: ” + fdt); } }
    Output for the above program
    Date before formatting: 2020-10-09T14:21:51.602193 Date after formatting: 09-10-2020, 14-21-51

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