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This Java Programming tutorial contains various real-time project-related examples where utilities function written for Date. Please find the programs below and let us know if you want to add any specific one –

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This Java Programming helps to convert Date String in ‘yyyy-mm-dd’ format to java SQL Date format. This program will be used when the date came from UI component and need to persist in the database. Please find the program below –

package com.kw.datetime;

import java.sql.Date;
import java.time.LocalDate;

/**
 * This Java class helps to write programming examples related to Java Date API.
 * @author dknitk
 *
 */
public class JavaDateAPIConvrtStringToSQLDate {
	
	/**
	 * This main method helps to execute the Java Program. 
	 * We can pass various Input to test the functionality. 
	 * @param args
	 */
	public static void main(String[] args) {
		System.out.println("Welcome to Java Date API Program Example!");
		JavaDateAPIConvrtStringToSQLDate apiExamples = new JavaDateAPIConvrtStringToSQLDate();
		System.out.println("**** Converted Date Is :::" + apiExamples.convertStringToSQLDate("2021-05-22"));
	}

	/**
	 * This program helps to convert String ('yyyy-mm-dd') Date to Java SQL Date.
	 * @param dateAsString
	 * @return java.sql.Date
	 * @since KW-12345
	 */
	public java.sql.Date convertStringToSQLDate(String dateAsString) {
		if (!isNullOrEmpty(dateAsString)) {
			LocalDate localDate = LocalDate.parse(dateAsString);
			return Date.valueOf(localDate);
		}
		return null;
	}

	/**
	 * This method helps to verify String as null and empty.
	 * @param data
	 * @return boolean
	 */
	private boolean isNullOrEmpty(String data) {
		return data == null || "".equals(data.trim());
	}

}

Program Output:

Welcome to Java Date API Program Example!
**** Converted Date Is :::2021-05-22

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Difference Between Two Date to get Year, Month and Days

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This Java Programming helps to get a number of days, years, and months between two given dates. Please find the program below –

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package com.kw.datetime;

import java.sql.Date;
import java.time.LocalDate;
import java.time.temporal.ChronoUnit;
import java.util.Objects;

/**
 * This Java class helps to write programming get two date difference. It will
 * provide to get Months, Days and Year.
 * 
 * @author dknitk
 *
 */
public class JavaDateAPITwoDateDifference {

	/**
	 * This main method helps to execute the Java Program. We can pass various Input
	 * to test the functionality.
	 * 
	 * @param args
	 */
	public static void main(String[] args) {
		System.out.println("Welcome to Java Date API Program Example!");
		JavaDateAPITwoDateDifference apiExamples = new JavaDateAPITwoDateDifference();
		LocalDate from = LocalDate.of(2021, 7, 30);
		LocalDate to = LocalDate.of(2022, 8, 30);
		System.out.println("**** Program Execution 1****");
		System.out.println("**** Total Number of Year between Dates Is :::" + apiExamples.getYears(from, to));
		System.out.println("**** Total Number of Month between Dates Is :::" + apiExamples.getMonths(from, to));
		System.out.println("**** Total Number of Day between Dates Is :::" + apiExamples.getDays(from, to));
		
		from = LocalDate.of(1990, 7, 30);
		to = LocalDate.of(2022, 11, 30);
		System.out.println("**** Program Execution 2****");
		System.out.println("**** Total Number of Year between Dates Is :::" + apiExamples.getYears(from, to));
		System.out.println("**** Total Number of Month between Dates Is :::" + apiExamples.getMonths(from, to));
		System.out.println("**** Total Number of Day between Dates Is :::" + apiExamples.getDays(from, to));
	}

	/**
	 * This program helps to get the total number of Months from two date
	 * difference.
	 * 
	 * @param from
	 * @param to
	 * @return Long
	 * @since KW-12345
	 */
	public Long getMonths(LocalDate from, LocalDate to) {
		if (!Objects.isNull(from) && !Objects.isNull(to)) {
			return ChronoUnit.MONTHS.between(from, to);
		}
		return null;
	}

	/**
	 * This program helps to get the total number of Days from two date difference.
	 * 
	 * @param from
	 * @param to
	 * @return Long
	 * @since KW-12345
	 */
	public Long getDays(LocalDate from, LocalDate to) {
		if (!Objects.isNull(from) && !Objects.isNull(to)) {
			return ChronoUnit.DAYS.between(from, to);
		}
		return null;
	}

	/**
	 * This program helps to get the total number of Year from two date difference.
	 * 
	 * @param from
	 * @param to
	 * @return Long
	 * @since KW-12345
	 */
	public Long getYears(LocalDate from, LocalDate to) {
		if (!Objects.isNull(from) && !Objects.isNull(to)) {
			return ChronoUnit.YEARS.between(from, to);
		}
		return null;
	}

}

Program Output:

Welcome to Java Date API Program Example!
* Program Execution 1*
**** Total Number of Year between Dates Is :::1
**** Total Number of Month between Dates Is :::13
**** Total Number of Day between Dates Is :::396
**** Program Execution 2****
**** Total Number of Year between Dates Is :::32
**** Total Number of Month between Dates Is :::388
**** Total Number of Day between Dates Is :::11811