DateTimeException

DateTimeException is a runtime exception in the java.time package of Java. It serves as the common superclass for errors that occur during date and time computations, parsing, and formatting. DateTimeException is unchecked, extending RuntimeException, and is used by the date-time API to signal problems that are not due to programmer error in method arguments but to invalid date-time values or malformed input.

Constructors include DateTimeException(String message), DateTimeException(String message, Throwable cause), and DateTimeException(Throwable cause).

Common causes include creating impossible dates or times (such as February 30), overflow from arithmetic operations, and failures in parsing or formatting with DateTimeFormatter. When parsing, a DateTimeParseException (which extends DateTimeException) may be thrown to indicate a malformed input string.

DateTimeException is the base class for several more specific exceptions in the java.time API; one notable subclass is DateTimeParseException, used specifically for parsing errors. Because it extends RuntimeException, methods that throw it are unchecked and do not require a throws declaration. This design allows date-time errors to be reported without mandatory exception handling by callers, while still enabling targeted catching of parsing-related or validation-related problems when needed.