Why is SimpleDateFormat Assigning All Dates to January When Parsing Active Directory Dates?

SimpleDateFormat Incorrectly Displaying Months

When working with dates, it's crucial that the data is converted accurately. However, when using Java's SimpleDateFormat to parse dates extracted from Active Directory (AD), an issue can arise where all dates are incorrectly assigned to January.

The Problem

In the provided code snippet, the SimpleDateFormat is initialized with the following pattern string:

SimpleDateFormat sdf = new SimpleDateFormat("yyyy/MM/DD");

This pattern string specifies the expected format of the date string: year (yyyy), month (MM), and day (DD). However, the parsedDate value consistently shows the month as January, regardless of the actual month included in the AD date.

The Solution

The issue lies in the usage of uppercase "MM" in the pattern string. In SimpleDateFormat, uppercase "MM" represents the month as a full name, while lowercase "MM" represents the month as a two-digit number.

To correct this issue, the pattern string should be modified to use lowercase "MM":

SimpleDateFormat sdf = new SimpleDateFormat("yyyy/MM/dd");

By using lowercase "MM", SimpleDateFormat will correctly parse the month as a two-digit number, eliminating the consistent January issue.

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