How to use DateTimeFormatter to get time only?

Question

I am making an appointment app and am trying to get only the time of the appointment to fill into a combobox. So far I was able to get just the date, but now I am having trouble with receiving just the time. It shows up as yyyy-MM-dd HH:mm in the combobox. The code in question are the last two statements. The modifyDate successfully prints only the date, but I just can't seem to figure out how to separate the date off and print just the time. I tried to create another DateTimeFormatter with HH:mm but that did not work. Thank you so much!

This setAppointment is what puts the data from an existing appointment into the modify screen:

public void setAppointment(Appointment appointment, int index) {
    selectedAppointment = appointment;
    selectedIndex = index;

    Appointment newAppointment = (Appointment) appointment;

    DateTimeFormatter format = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm");

    this.modifyContactNameText.setText(newAppointment.getContact());
    this.modifyTitleText.setText((newAppointment.getTitle()));
    this.modifyURLText.setText((newAppointment.getUrl()));
    this.modifyTypeText.setText((newAppointment.getType()));
    this.modifyDescriptionComboBox.setValue((newAppointment.getDescription()));
    this.modifyLocationComboBox.setValue((newAppointment.getLocation()));
    this.modifyDate.setValue(LocalDate.parse(newAppointment.getStart(), format));
    this.modifyStartComboBox.getSelectionModel().select(newAppointment.getStart(), format));
    this.modifyEndComboBox.getSelectionModel().select(newAppointment.getEnd(), format));

user_5558072 · Answer

Yes you need to convert String to LocalDateTime and then extract the time part using another formater:

...
DateTimeFormatter timeFormat = DateTimeFormatter.ofPattern("HH:mm");
String time = LocalDateTime.parse(newAppointment.getStart(), format)
             .format(timeFormat);

Or much better:

LocalTime localTime = LocalDateTime.parse(newAppointment.getStart(), format)
    .toLocalTime();

Output

11:00

How to use DateTimeFormatter to get time only?

1 Answers