Lesson: 96 | Convert 24-Hour Time to 12-Hour Format

User Story
Codes

User Story

As a user, I want to convert a 24-hour formatted time string into a 12-hour format with an AM/PM suffix, so that I can easily understand the time in a familiar format.

The system should allow users to input a time in the 24-hour format (e.g., "14:30") and convert it to the corresponding 12-hour format (e.g., "02:30 PM"). This conversion should correctly handle all edge cases such as midnight ("00:00") converting to "12:00 AM" and noon ("12:00") converting to "12:00 PM".

Codes

public class TimeUtility {
    
    public static String changeTimeFormat(String strTime) {
    List<String> timeStamps = strTime.split(':');
    String hours = timeStamps[0];
    String formattedTime = '';
    Integer hoursValue = Integer.valueOf(timeStamps[0]);

    if(hoursValue == 0) {
        timeStamps[0] = String.valueOf(hoursValue + 12);
        hours = timeStamps[0];
        formattedTime = String.format('{0}:{1} AM', new List<String>{hours, timeStamps[1]});
        return formattedTime;
    }

    if(hoursValue == 12) {
        return strTime + ' PM';
    }

    if(hoursValue > 12) {
        hoursValue = hoursValue - 12;
        timeStamps[0] = hoursValue < 10 ? ('0' + String.valueOf(hoursValue)) : String.valueOf(hoursValue);
        hours = timeStamps[0];
        formattedTime = String.format('{0}:{1} PM', new List<String>{hours, timeStamps[1]});
        return formattedTime;
    }
        
    

    return strTime + ' AM';
}


}

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Lesson: 96 | Convert 24-Hour Time to 12-Hour Format

User Story

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