Java8 Adding Hours To LocalDateTime Not Working

Question

I tried like below, but in both the cases it is showing same time? What i am doing wrong.

    LocalDateTime currentTime = LocalDateTime.now(ZoneId.of(\"UTC\"));
         


        

Answer 1

From the java.time package Javadoc (emphasis mine):

The classes defined here represent the principal date-time concepts, including instants, durations, dates, times, time-zones and periods. They are based on the ISO calendar system, which is the de facto world calendar following the proleptic Gregorian rules. All the classes are immutable and thread-safe.

Since every class in the java.time package is immutable, you need to capture the result:

LocalDateTime after = currentTime.plusHours(12);
...