How to Parse and Format Dates and Times Using Java's LocalDateTime?

How to Handle Dates and Times with LocalDateTime

Parsing

Java 8 introduced the java.time API, leveraging LocalDateTime for advanced date and time manipulation. To parse a string (e.g., "2014-04-08 12:30") into a LocalDateTime instance, utilize the LocalDateTime.parse() method, providing a DateTimeFormatter with the desired 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

Conversely, to format a LocalDateTime instance back to the original string format, employ the format() method in conjunction with the same DateTimeFormatter:

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"

Commonly Used Formats

The DateTimeFormatter class provides predefined constants for commonly used date/time formats:

String formattedDateTime2 = dateTime.format(DateTimeFormatter.ISO_DATE_TIME); // "1986-04-08T12:30:00"

Availability

Note that the parse() and format() methods are available for all java.time date/time related objects, such as LocalDate or ZonedDateTime.

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