How to Format a Java Calendar Date as yyyy-MM-dd?

Converting Calendar Date to yyyy-MM-dd Format in Java

In Java programming, a common task is to convert a calendar date into the widely-used yyyy-MM-dd format, often required for comparison and handling in databases.

Issue:

When using the Calendar class to represent a date, it is returned as a Date object. However, when directly converting the Date object to a string, it defaults to a verbose format that includes the time and timezone information, such as "Wed Sep 26 00:00:00 IST 2012." This format is not suitable for comparisons in database criteria, where the expected format is "2012-09-26."

Solution:

To address this issue, we can utilize the SimpleDateFormat class to explicitly format the Date object into the desired yyyy-MM-dd format. Here's how to achieve this:

Calendar cal = Calendar.getInstance();
cal.add(Calendar.DATE, 1);
SimpleDateFormat format1 = new SimpleDateFormat("yyyy-MM-dd");
String date1 = format1.format(cal.getTime());

The formatted date is now in the yyyy-MM-dd format, ensuring proper comparison and handling in database criteria.

Note:

• In Java 8 and later, consider using the LocalDateTime class and DateTimeFormatter for more flexible date and time handling.
• Alternatively, the ThreeTen Backport project provides these features for Java versions prior to 8.

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