conversion of 24 hours clock in 12 hours JAVAFX

Question

i want to make an analogue clock which displays system time. My code is working perfectly but the only issue i am having is that i want to show time in 12 Hours format but its showing in 24 hours format.

 void setCurrentTime() {
       Calendar calendar = new GregorianCalendar();
// Set current hour, minute, and second
this.hour = calendar.get(Calendar.HOUR_OF_DAY);
this.minute = calendar.get(Calendar.MINUTE);
this.second = calendar.get(Calendar.SECOND);
paintClock();
}

Answer 1

Use Calendar.HOUR instead of Calendar.HOUR_OF_DAY

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From Javadocs for Hour :

Field number for get and set indicating the hour of the morning or afternoon. HOUR is used for the 12-hour clock (0 - 11)

From Javadocs for HOUR_OF_DAY :

Field number for get and set indicating the hour of the day. HOUR_OF_DAY is used for the 24-hour clock.

Answer 2

Assuming, from your use of JavaFX, that you're also using Java 8:

Let the venerable Calendar class retire. Use java.time :

LocalTime currTime = LocalTime.now();
this.hour   = currTime.get(ChronoField.HOUR_OF_AMPM);
this.minute = currTime.getMinute();
this.second = currTime.getSecond();