Category: date

change timezone of date in java

Post author By Rajesh Kumar
Post date June 18, 2020
No Comments on change timezone of date in java

In this post, we will learn to change timezone of date in java

In java by default new Date() will give you the system/server timezone.

Syntax

dateFormat.setTimeZone(TimeZone.getTimeZone("UTC"));

Example


import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.TimeZone;

public class ChangeTimeZon {

	public static void main(String[] args) {
		try {
			Date date = new Date();
			System.out.println("Current Date Time : " + date);
			DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss z");
			// In below line we are mentioned to convert into UTC
			dateFormat.setTimeZone(TimeZone.getTimeZone("UTC"));
			String utcFormat = dateFormat.format(date);
			System.out.println("After converting into UTC format: " + utcFormat);

		} catch (Exception e) {
			e.printStackTrace();
		}
	}

}

Output

Current Date Time : Thu Jun 18 15:29:35 IST 2020
After converting into UTC format: 2020-06-18 09:59:35 UTC

Conclusion

In the above post, we learned to change timezone of date in java

Github

https://github.com/rkumar9090/BeginnersBug/blob/master/BegineersBug/src/com/geeks/example/date/ChangeTimeZon.java

calculate number days between two dates using java

Tags change, date, date_format, timezone

date java

calculate number days between two dates using java

Post author By Rajesh Kumar
Post date March 2, 2020
No Comments on calculate number days between two dates using java

In this tutorial, we will learn about calculate number days between two dates using java

There are lot of ways to calculate number of days between two dates in java

Using Java 8

In below example, we are going to use ChronoUnit to calculate days between two days

Syntax

ChronoUnit.DAYS.between(startDate, endDate);

Example


import java.time.LocalDate;
import java.time.Month;
import java.time.temporal.ChronoUnit;

public class CalculateDaysBetweenDatesJava8 {

	public static void main(String[] args) {
		try {
			// Start date is 2020-03-01 (YYYY-MM-dd)
			LocalDate startDate = LocalDate.of(2020, Month.MARCH, 1);

			// end date is 2020-03--03 (YYYY-MM-dd)
			LocalDate endDate = LocalDate.of(2020, Month.MARCH, 3);

			long numberOfDays = ChronoUnit.DAYS.between(startDate, endDate);

			System.out.println("Number of days " + numberOfDays);

		} catch (Exception e) {
			e.printStackTrace();
		}
	}

}

Output

Number of days 2

Above example is easiest way to calculate days between two dates

Int the below example we are going to use traditional way to calculate days between two days

Below Java 8

In below example we are going to use GregorianCalendar to calculate number of days between two dates

Example


import java.util.Calendar;
import java.util.GregorianCalendar;

public class CalculateDaysUsingCalender {

	public static void main(String[] args) {
		try {
			Calendar startDate = new GregorianCalendar();
			Calendar endDate = new GregorianCalendar();

			// Start date is 2020-03-01 (YYYY-MM-dd)
			startDate.set(2020, 03, 1);

			// end date is 2020-03--03 (YYYY-MM-dd)
			endDate.set(2020, 03, 3);

			// subtract emdTime-StartTime and divide by (1000 * 60 * 60 * 24)
			int i = (int) ((endDate.getTime().getTime() - startDate.getTime().getTime()) / (1000 * 60 * 60 * 24));
			System.out.println("Number of days " + i);

		} catch (Exception e) {
			e.printStackTrace();
		}
	}

}

Output

Number of days 2

Github

https://github.com/rkumar9090/BeginnersBug/blob/master/BegineersBug/src/com/geeks/example/CalculateDaysUsingCalender.java

https://github.com/rkumar9090/BeginnersBug/blob/master/BegineersBug/src/com/geeks/example/CalculateDaysBetweenDatesJava8.java

convert String to date in java with example

compare two dates in java example

Tags calculate, date, java

date java

compare two dates in java example

Post author By Rajesh Kumar
Post date February 20, 2020
No Comments on compare two dates in java example

In this post, we will learn to compare two dates in java example

There are multiple ways to compare two dates in java.

In the First example we will learn to compare dates using compareTo() method

While using compareTo() method we are having 3 chances of output. Below are the possible output

0 – When both the dates are equal

1 – When date 1 is greater than date 2

-1 – When date 1 is lesser than date 2

Syntax

date1.compareTo(date2)

Example


import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;

public class DateCompareExample {
	public static void main(String[] args) {
		try {

			String date1 = "22/02/2020";
			String date2 = "21/02/2020";
			DateFormat format = new SimpleDateFormat("DD/MM/yyyy");
			Date dateObj1 = format.parse(date1);
			Date dateObj2 = format.parse(date2);

			// If Both the date are same comparTo Method will return 0
			if (dateObj1.compareTo(dateObj2) == 0) {
				System.out.println("Both the dates are Equal !!");
			} // If date1 greater than date 2 it will return 1
			else if (dateObj1.compareTo(dateObj2) > 0) {

				System.out.println("Date 1 is greater than date 2");
			} // If date1 lesser than date 2 it will return -1
			else {
				System.out.println("Date 1 is lesser than date 2");
			}

		} catch (Exception e) {
			e.printStackTrace();
		}

	}

}

Date 1 is greater than date 2

Using equals(),after(),before()

In the above example, we learned using compareTo() method. But we can compare dates using predefined functions also.

Below example is another way to compare two dates in java

equals() – return true if both the dates are equal

after() – return true if date 1 greater than date 2

before() – return true if date 1 lesser than date 2

Example


import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;

public class DateCompareExample {
	public static void main(String[] args) {
		try {

			String date1 = "20/02/2020";
			String date2 = "21/02/2020";
			DateFormat format = new SimpleDateFormat("DD/MM/yyyy");
			Date dateObj1 = format.parse(date1);
			Date dateObj2 = format.parse(date2);

			// If Both the date are same comparTo Method will return 0
			if (dateObj1.equals(dateObj2)) {
				System.out.println("Both the dates are Equal !!");
			} // If date1 greater than date 2 it will return 1
			else if (dateObj1.after(dateObj2)) {

				System.out.println("Date 1 is after than date 2");
			} // If date1 lesser than date 2 it will return -1
			else if (dateObj1.before(dateObj2)) {
				System.out.println("Date 1 is before than date 2");
			}

		} catch (Exception e) {
			e.printStackTrace();
		}

	}

}

Output

Date 1 is before than date 2

Reference

https://docs.oracle.com/javase/8/docs/api/java/util/Date.html#compareTo-java.util.Date-

convert String to date in java with example

Tags compare, date, java

date java

convert String to date in java with example

Post author By Rajesh Kumar
Post date February 20, 2020
No Comments on convert String to date in java with example

In this tutorial, we will learn to convert String to date in java with example.While we working with java this is one of the most scenario

We can easily convert String to Data using SimpleDateFormat.java. But before that we should know the date patterns which mentioned below

Letter	Component	Presentation	Examples
y	Year	Year	1996; 96
M	Month in year	Month	July; Jul; 07
d	Day in month	Number	10
a	Am/pm marker	Text	PM
H	Hour in day (0-23)	Number	0
k	Hour in day (1-24)	Number	24
K	Hour in am/pm (0-11)	Number	0
h	Hour in am/pm (1-12)	Number	12
m	Minute in hour	Number	30
s	Second in minute	Number	55
S	Millisecond	Number	978

In this example we will convert 20/02/2020 to Date class

Syntax

DateFormat simpleDateFormat = new SimpleDateFormat("dd/MM/YYYY");
 simpleDateFormat.parse(dateString);

Example


import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

public class SimpleDateFormatExample {

	public static void main(String[] args) {
		try {
			String dateString = "20/02/2020";
			DateFormat simpleDateFormat = new SimpleDateFormat("dd/MM/YYYY");
			// Below line will convert from string to date
			Date parse = simpleDateFormat.parse(dateString);
			// The output will be like Sun Dec 29 00:00:00 IST 2019
			System.out.println(" Output :: "+parse);
		} catch (ParseException e) {
			e.printStackTrace();
		}

	}

}

Output

 Output :: Sun Dec 29 00:00:00 IST 2019

Reference

https://docs.oracle.com/javase/8/docs/api/java/text/SimpleDateFormat.html

Download

https://github.com/rkumar9090/BeginnersBug/blob/master/BegineersBug/src/com/geeks/example/SimpleDateFormatExample.java

print current date in java with example

compare two dates in java example

Tags date, java

date java

add 3 days to the current date in java

Post author By Rajesh Kumar
Post date February 18, 2020
1 Comment on add 3 days to the current date in java

In this post we will learn to add 3 days to the current date in java
While we working with dates we will come up with adding or subtracting from the current date

In Java there are lot of method for Date. So it is little bit difficult to remember all the things.

In this example we used Calendar.java and Date.java from java.util package
In below example we added 3 days

Syntax

object.add(Calendar.DAY_OF_YEAR, 1)

Example

import java.util.Calendar;
import java.util.Date;

public class AddDaysToDate {

	public static void main(String[] args) {
		try {
			Calendar calender = Calendar.getInstance();
			Date beforeAdding = calender.getTime();
			System.out.println("Printing the value before adding date ::: " + beforeAdding);

			// Adding the 3 days below
			calender.add(Calendar.DAY_OF_YEAR, 3);
			Date afterAdding = calender.getTime();
			System.out.println("Printing the value after adding date  ::: " + afterAdding);

		} catch (Exception e) {
			e.printStackTrace();
		}
	}

}

Output

Printing the value before adding date ::: Thu Feb 13 17:00:21 IST 2020
Printing the value after adding date  ::: Sun Feb 16 17:00:21 IST 2020

Github

https://github.com/rkumar9090/BeginnersBug/blob/master/BegineersBug/src/com/geeks/example/AddDaysToDate.java

convert String to date in java with example

compare two dates in java example

Tags date, java

date java

print current date in java with example

Post author By Rajesh Kumar
Post date December 23, 2019
No Comments on print current date in java with example

print current date in java with example

In this post we will learn to print current date in java with examples
Here we used Date.java from java.util package
In this example the time zone will be your default system time zone

Example

import java.util.Date;

public class DateExample {
	   
	public static void main(String[] args) {
          Date date = new Date();
          System.out.println("Current Date : " + date);
     }
}

Output

Current Date : Mon Dec 23 21:35:59 IST 2019

Reference

https://beginnersbug.com/add-3-days-to-the-current-date-in-java/

https://github.com/rkumar9090/BeginnersBug/blob/master/BegineersBug/src/com/geeks/example/DateExample.java

Tags date, java

Syntax

Example

Output

Conclusion

Github

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Using Java 8

Syntax

Example

Output

Below Java 8

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Output

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Using equals(),after(),before()

Example

Output

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