How to Parse Dates in Java and Resolve the \'java.text.ParseException: Unparseable date\' Error?

Parsing Date with Java: Resolving "java.text.ParseException: Unparseable date" Issue

When attempting to parse a date string in Java, it's crucial to ensure that the date format pattern aligns precisely with the input string. In your case, the exception "java.text.ParseException: Unparseable date" suggests a mismatch between the pattern and the input.

Your original pattern, "MMM d, yyyy HH:mm:ss", assumes the date is in the format "Jun 01, 2013 12:53:10". However, the input string includes additional information, notably "Sat" for the day of the week and "IST" for the time zone.

Solution:

To resolve this issue, update the date format pattern to accurately match the input string. The corrected pattern is:

SimpleDateFormat sdf = new SimpleDateFormat("EE MMM dd HH:mm:ss z yyyy", Locale.ENGLISH);

This pattern includes:

• EE: Day of the week (e.g., "Sat")
• MMM: Three-letter month abbreviation (e.g., "Jun")
• dd: Day of the month (e.g., "01")
• HH: 24-hour format hour (e.g., "12")
• mm: Minute (e.g., "53")
• ss: Second (e.g., "10")
• z: Time zone abbreviation (e.g., "IST")
• yyyy: Year (e.g., "2013")

Printing the Desired Format:

Once the date is successfully parsed using the correct pattern, you can obtain the desired output format using a separate SimpleDateFormat instance:

Date parsedDate = sdf.parse(date);
SimpleDateFormat print = new SimpleDateFormat("MMM d, yyyy HH:mm:ss");
System.out.println(print.format(parsedDate));

Notes:

• To avoid locale-specific issues, explicitly specify Locale.ENGLISH as the locale for the SimpleDateFormat used to parse.
• If the input string contains an ambiguous time zone abbreviation like "IST," it's recommended to include the full time zone name instead.

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