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To add a millisecond to a LocalDateTime, you can use the "plus" method provided by the LocalDateTime class. Here is an example:

LocalDateTime dateTime = LocalDateTime.now();
LocalDateTime dateTimePlusMilli = dateTime.plus(1, ChronoUnit.MILLIS);

In this example, we first obtain the current LocalDateTime by calling the static "now" method of the LocalDateTime class. Then, we use the "plus" method to add one millisecond to the LocalDateTime. The first argument of the "plus" method specifies the amount to add, and the second argument specifies the unit of time (in this case, millis). The resulting LocalDateTime with the added millisecond is stored in the "dateTimePlusMilli" variable.