Here are a few title options, focusing on the core issue and solution: Option 1 (Direct and Problem-Focused): * Why does SimpleDateFormat.parse produce inconsistent output when converting UNIX times

SimpleDateFormatter.parse Output Format Discrepancy

When attempting to convert a UNIX timestamp into a specific date format using SimpleDateFormat, users may encounter inconsistencies between the formatted and parsed outputs.

One reason for this discrepancy is the potential for mismatched time zones. Ensure that the SimpleDateFormat's time zone matches the expected output. Additionally, verify that the epoch timestamp is represented in milliseconds, as required by Date's constructor.

Suggested Solution:

To avoid potential formatting issues and ensure database compatibility, it is recommended to pass date objects directly to MySQL instead of strings. Utilize java.time classes, such as LocalDateTime, to represent dates and times.

Here's an updated code snippet:

<code class="java">String ep = "a1527069600";
long epoch = Long.parseLong(ep.substring(1));
Instant instant = Instant.ofEpochSecond(epoch);
LocalDateTime ldt = instant.atZone(ZoneId.of("Asia/Calcutta")).toLocalDateTime();

PreparedStatement ps = myDatabaseConnection.prepareStatement(
        "insert into my_table (my_date_time) values (?)");
ps.setObject(1, ldt);</code>

This approach ensures that the date is formatted according to the specified time zone and is stored as an object in the database, eliminating the potential for formatting errors.

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