How to get the number of hours since the start of January 1 of the current year?

Question

How can I get the number of hours since the start of January 1 of the current year in Java? I. e. first hour of January 1 = 0001 Can I accomplish this with JodaTime or any other lib? Thanks,

Answer 1

Using the java.time package built into Java 8 and later (Tutorial):

ChronoUnit.HOURS.between(
  LocalDateTime.of(LocalDateTime.now().getYear(), 1, 1, 0, 0), 
  LocalDateTime.now())

I think this is self-explenatory

Answer 2

Use the Java 8 API for date/time

    LocalDateTime hournow = LocalDateTime.now();
    LocalDateTime startOfYear = LocalDateTime.of(hournow.getYear(), 1, 1, 0, 0);
    long hoursBetween = ChronoUnit.HOURS.between(startOfYear, hournow);
    System.out.println("hours between: " + hoursBetween);