DateTimeParseException

Why This Happens

DateTimeParseException is thrown by LocalDate.parse(), LocalDateTime.parse(), and DateTimeFormatter when the input string does not match the expected pattern or contains invalid date values like month 13 or day 32.

The Problem

LocalDate date = LocalDate.parse("01/15/2024"); // Expects yyyy-MM-dd format

The Fix

DateTimeFormatter formatter = DateTimeFormatter.ofPattern("MM/dd/yyyy");
LocalDate date = LocalDate.parse("01/15/2024", formatter);

Step-by-Step Fix

1. 1

   Identify the parse error

   Read the exception message for the input string and the position where parsing failed.

2. 2

   Check the format pattern

   Verify the DateTimeFormatter pattern matches the actual input format. Common: yyyy-MM-dd, MM/dd/yyyy, dd-MMM-yyyy.

3. 3

   Fix the pattern or input

   Create a DateTimeFormatter with the correct pattern, or normalize the input string to match the expected format.