How Can I Parse and Format Dates and Times Using Java 8's LocalDateTime?

Parsing and Formatting Dates with LocalDateTime in Java 8

Java 8 introduced the java.time API for enhanced date and time handling. This API includes the LocalDateTime class to represent dates and times without a specific time zone. Here's how to parse dates from strings and format LocalDateTime instances back to strings:

Parsing Date and Time Strings

To parse a date and time string (such as "2014-04-08 12:30") into a LocalDateTime instance, use the static parse() method with a DateTimeFormatter. The formatter specifies the date/time pattern:

String str = "1986-04-08 12:30";
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm");
LocalDateTime dateTime = LocalDateTime.parse(str, formatter);

Formatting LocalDateTime Instances

To format a LocalDateTime instance back to a string with the same pattern, use the format() method:

DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm");
LocalDateTime dateTime = LocalDateTime.of(1986, Month.APRIL, 8, 12, 30);
String formattedDateTime = dateTime.format(formatter); // "1986-04-08 12:30"

Additional Notes

• Predefined formatters like DateTimeFormatter.ISO_DATE_TIME can be used for common date/time formats (e.g., ISO 8601).
• The parse() and format() methods are available for other date/time types like LocalDate and ZonedDateTime.

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