Question

Could please anybody explain to me, how DateTime works in regards to AM/PM ?

public DateTime(
        int year,
        int monthOfYear,
        int dayOfMonth,
        int hourOfDay,
        int minuteOfHour,
        int secondOfMinute,
        int millisOfSecond,
        DateTimeZone zone) {
    super(year, monthOfYear, dayOfMonth,
          hourOfDay, minuteOfHour, secondOfMinute, millisOfSecond, zone);
}

I know that I could handle AM/PM via DateFormat and parsing string, but I’m interested in this method. I can’t figure this out. Because DateTimeZone doesn’t relate directly to Locale, Chronology does not too.

Do I have to manually change the hourOfDay based on AM/PM information into the 24 hours type ?

I’m working with a UI html form widget >> http request 6 parameters, based on Locale (y,m,d,h,m,AM/PM) / (y,m,d,h,m) >> now I’d like to create Date object from these 5/6 values via JodaTime’s DateTime object. Is it possible without me manually having to convert (y,m,d,h,m,AM/PM) to (y,m,d,h,m) ?

Manually I’d do that like this

public static Date getDateSinceUTC2(Target orderBean, TimeZone tz) {

    int ap = orderBean.getDeadLineAmPm();
    int year = orderBean.getDeadLineYear();
    int month = orderBean.getDeadLineMonth();
    int day = orderBean.getDeadLineDay();
    int hour = orderBean.getDeadLineHour();
    int minute = orderBean.getDeadLineMinute();

    if (ap == 1) {
        hour += 12;
    }

    month++;

    DateTime dt = new DateTime(year, month, day, hour, minute, 0, 0, DateTimeZone.forID(tz.getID()));

    return new Date(dt.getMillis());
}

Answer 1

Firstly, I would start off using LocalDateTime unless you’ve actually got a time zone.

But you could create either a DateTime or a LocalDateTime by giving it any hour, and then using:

// I'm assuming amPm is 0 for am and 1 for pm
result = original.withField(DateTimeFieldType.hourOfHalfDay(), hour)
                 .withField(DateTimeFieldType.halfDayOfDay(), amPm);

I think I’d personally probably perform the conversion to “hour of 24-hour day” myself though.