Java Convert String to Date and Time

Write a program that exemplifies conversions between String and date/time.
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Java Convert String to date and time

package net.sourcecodeexamples.java.Searches; import java.text.DateFormat; import java.text.ParseException; import java.text.SimpleDateFormat; import java.time.LocalDate; import java.time.LocalDateTime; import java.time.LocalTime; import java.time.ZonedDateTime; import java.time.format.DateTimeFormatter; import java.util.Date; public class Main { public static void main(String[] args) throws ParseException { // convert String to Date String date = "1-Aug-2020 08:22:34 GMT"; DateFormat simpleDateFormatter = new SimpleDateFormat("dd-MMM-yyyy HH:mm:ss zzz"); Date dateSimpleFormatted = simpleDateFormatter.parse(date); // convert Date to String String dateAsDefaultString = dateSimpleFormatted.toString(); String dateAsFormattedString = simpleDateFormatter.format(dateSimpleFormatted); System.out.println("Default format: " + dateAsDefaultString); System.out.println("Explicit format: " + dateAsFormattedString); System.out.println("\nJava 8, convert without formatter:"); // convert String to LocalDate LocalDate localDate = LocalDate.parse("2020-07-01"); // convert LocalDate to String String localDateAsDefaultString = localDate.toString(); System.out.println("LocalDate: " + localDateAsDefaultString + "( year: " + localDate.getYear() + ", month: " + localDate.getMonthValue() + ", day: " + localDate.getDayOfMonth() + " )"); LocalTime localTime = LocalTime.parse("12:23:44"); // convert LocalTime to String String localTimeAsDefaultString = localTime.toString(); System.out.println("LocalTime: " + localTimeAsDefaultString + "( hour: " + localTime.getHour() + ", minute: " + localTime.getMinute() + ", second: " + localTime.getSecond() + " )"); // convert String to LocalDateTime LocalDateTime localDateTime = LocalDateTime.parse("2020-06-01T11:20:15"); // convert LocalDateTime to String String localDateTimeAsDefaultString = localDateTime.toString(); System.out.println("LocalDateTime: " + localDateTimeAsDefaultString + "( year: " + localDateTime.getYear() + ", month: " + localDateTime.getMonthValue() + ", day: " + localDateTime.getDayOfMonth() + ", hour: " + localDateTime.getHour() + ", minute: " + localDateTime.getMinute() + ", second: " + localDateTime.getSecond() + " )"); // convert String to ZonedDateTime ZonedDateTime zonedDateTime = ZonedDateTime.parse("2020-06-01T10:15:30+09:00[Asia/Tokyo]"); // convert ZonedDateTime to String String zonedDateTimeAsDefaultString = zonedDateTime.toString(); System.out.println("ZonedDateTime: " + zonedDateTimeAsDefaultString + "( year: " + zonedDateTime.getYear() + ", month: " + zonedDateTime.getMonthValue() + ", day: " + zonedDateTime.getDayOfMonth() + ", hour: " + zonedDateTime.getHour() + ", minute: " + zonedDateTime.getMinute() + ", second: " + zonedDateTime.getSecond() + ", offset: " + zonedDateTime.getOffset() + ", zone: " + zonedDateTime.getZone() + " )"); System.out.println("\nJava 8, convert with formatter:"); DateTimeFormatter dateFormatter = DateTimeFormatter.ofPattern("dd.MM.yyyy"); // convert String to LocalDate LocalDate localDateFormatted = LocalDate.parse("01.06.2020", dateFormatter); // convert LocalDate to String String localDateAsFormattedString = dateFormatter.format(localDateFormatted); System.out .println("Date: " + localDateAsFormattedString + "( year: " + localDateFormatted.getYear() + ", month: " + localDateFormatted.getMonthValue() + ", day: " + localDateFormatted.getDayOfMonth() + " )"); DateTimeFormatter timeFormatter = DateTimeFormatter.ofPattern("HH|mm|ss"); // convert String to LocalTime LocalTime localTimeFormatted = LocalTime.parse("12|23|44", timeFormatter); // convert LocalTime to String String localTimeAsFormattedString = timeFormatter.format(localTimeFormatted); System.out.println("Time: " + localTimeAsFormattedString + "( hour: " + localTimeFormatted.getHour() + ", minute: " + localTimeFormatted.getMinute() + ", second: " + localTimeFormatted.getSecond() + " )"); DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern("dd.MM.yyyy, HH:mm:ss"); // convert String to LocalDateTime LocalDateTime localDateTimeFormatted = LocalDateTime.parse("01.06.2020, 11:20:15", dateTimeFormatter); // convert LocalDateTime to String String localDateTimeAsFormattedString = dateTimeFormatter.format(localDateTimeFormatted); System.out.println("DateTime: " + localDateTimeAsFormattedString + "( year: " + localDateTimeFormatted.getYear() + ", month: " + localDateTimeFormatted.getMonthValue() + ", day: " + localDateTimeFormatted.getDayOfMonth() + ", hour: " + localDateTimeFormatted.getHour() + ", minute: " + localDateTimeFormatted.getMinute() + ", second: " + localDateTimeFormatted.getSecond() + " )"); } }

Output

Default format: Sat Aug 01 13:52:34 IST 2020 Explicit format: 01-Aug-2020 13:52:34 IST Java 8, convert without formatter: LocalDate: 2020-07-01( year: 2020, month: 7, day: 1 ) LocalTime: 12:23:44( hour: 12, minute: 23, second: 44 ) LocalDateTime: 2020-06-01T11:20:15( year: 2020, month: 6, day: 1, hour: 11, minute: 20, second: 15 ) ZonedDateTime: 2020-06-01T10:15:30+09:00[Asia/Tokyo]( year: 2020, month: 6, day: 1, hour: 10, minute: 15, second: 30, offset: +09:00, zone: Asia/Tokyo ) Java 8, convert with formatter: Date: 01.06.2020( year: 2020, month: 6, day: 1 ) Time: 12|23|44( hour: 12, minute: 23, second: 44 ) DateTime: 01.06.2020, 11:20:15( year: 2020, month: 6, day: 1, hour: 11, minute: 20, second: 15 )
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