In this code snippet example you will learn how to parse a text string into an instance of LocalDate, LocalTime and LocalDateTime. All of these classes provide a parse() method that accept an argument of text string that represent a valid date and time information and convert it into the corresponding object.
If the text string passed into the parse() method is not representing a valid date or time information this method throws a RuntimeException of type DateTimeParseException exception. If you want to handle this exception then you should wrap your code inside a try-catch block.
Let’s see the code snippet below as an example:
package org.kodejava.datetime;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.format.DateTimeParseException;
public class DateTimeParseDemo {
public static void main(String[] args) {
// Parse string "2021-09-12" into LocalDate instance.
LocalDate date = LocalDate.parse("2021-09-12");
// Parse string "17:51:15: into LocalTime instance.
LocalTime time = LocalTime.parse("17:51:15");
// Parse string "2021-09-12T17:51:15" into LocalDateTime instance.
LocalDateTime dateTime = LocalDateTime.parse("2021-09-12T17:51:15");
System.out.println("date = " + date);
System.out.println("time = " + time);
System.out.println("dateTime = " + dateTime);
try {
// When the string cannot be parsed, a RuntimeException of type
// DateTimeParseException will be thrown.
LocalDate date1 = LocalDate.parse("2021-02-31");
System.out.println("date1 = " + date1);
} catch (DateTimeParseException e) {
e.printStackTrace();
}
}
}
Running this code snippet will produce the following result:
date = 2021-09-12
time = 17:51:15
dateTime = 2021-09-12T17:51:15
java.time.format.DateTimeParseException: Text '2021-02-31' could not be parsed: Invalid date 'FEBRUARY 31'
at java.base/java.time.format.DateTimeFormatter.createError(DateTimeFormatter.java:2023)
at java.base/java.time.format.DateTimeFormatter.parse(DateTimeFormatter.java:1958)
at java.base/java.time.LocalDate.parse(LocalDate.java:430)
at java.base/java.time.LocalDate.parse(LocalDate.java:415)
at org.kodejava.datetime.DateTimeParseDemo.main(DateTimeParseDemo.java:27)
Caused by: java.time.DateTimeException: Invalid date 'FEBRUARY 31'
at java.base/java.time.LocalDate.create(LocalDate.java:461)
at java.base/java.time.LocalDate.of(LocalDate.java:273)
at java.base/java.time.chrono.IsoChronology.resolveYMD(IsoChronology.java:654)
at java.base/java.time.chrono.IsoChronology.resolveYMD(IsoChronology.java:126)
at java.base/java.time.chrono.AbstractChronology.resolveDate(AbstractChronology.java:442)
at java.base/java.time.chrono.IsoChronology.resolveDate(IsoChronology.java:586)
at java.base/java.time.chrono.IsoChronology.resolveDate(IsoChronology.java:126)
at java.base/java.time.format.Parsed.resolveDateFields(Parsed.java:365)
at java.base/java.time.format.Parsed.resolveFields(Parsed.java:272)
at java.base/java.time.format.Parsed.resolve(Parsed.java:259)
at java.base/java.time.format.DateTimeParseContext.toResolved(DateTimeParseContext.java:331)
at java.base/java.time.format.DateTimeFormatter.parseResolved0(DateTimeFormatter.java:2058)
at java.base/java.time.format.DateTimeFormatter.parse(DateTimeFormatter.java:1954)
... 3 more
As we can see from the output above, parsing a text string of "2021-02-31" give us a DateTimeParseException because the 31 of February is not a valid date.
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