Add two String Times in java [duplicate]

Answer 1

Keep in mind that you can convert int values for hours/minutes/seconds to a single int like this:

int totalSeconds = ((hours * 60) + minutes) * 60 + seconds;

And convert back:

int hours = totalSeconds / 3600;  // Be sure to use integer arithmetic
int minutes = ((totalSeconds) / 60) % 60;
int seconds = totalSeconds % 60;

Or you can do arithmetic piecemeal as follows:

int totalHours = hours1 + hours2;
int totalMinutes = minutes1 + minutes2;
int totalSeconds = seconds1 + seconds2;
if (totalSeconds >= 60) {
  totalMinutes ++;
  totalSeconds = totalSeconds % 60;
}
if (totalMinutes >= 60) {
  totalHours ++;
  totalMinutes = totalMinutes % 60;
}

Answer 2

Use SimpleDateFormat to parse the Strings then you can add the hours minutes and seconds

something like

 SimpleDateFormat df = new SimpleDateFormat("HH:mm:ss");
  d1 = df.parse("1:30:00");
  d2 = df.parse("1:35:00");

Long sumtime= d1.getTime()+d2.getTime();

you can see this here as well it looks like possible duplicate of #####

or if you want to use Calender API, then you can also do it using Calender API, then u can do something like

Calendar c1 = Calendar.getInstance();
    Calendar c2 = Calendar.getInstance();
     Calendar cTotal = Calendar.getInstance(); 
    cTotal.add(c1.get(Calendar.YEAR), c2.get(Calendar.YEAR));
    cTotal.add(c1.get(Calendar.MONTH) + 1)), c2.get(Calendar.MONTH) + 1)); // Months are zero-based!
    cTotal.add(c1.get(Calendar.DATE), c2.get(Calendar.DATE));

Answer 3

String time1="0:01:30";
String time2="0:01:35";

SimpleDateFormat timeFormat = new SimpleDateFormat("HH:mm:ss");
timeFormat.setTimeZone(TimeZone.getTimeZone("UTC"));

Date date1 = timeFormat.parse(time1);
Date date2 = timeFormat.parse(time2);

long sum = date1.getTime() + date2.getTime();

String date3 = timeFormat.format(new Date(sum));
System.out.println("The sum is "+date3);

Ouput : The sum is 00:03:05

Answer 4

Just sum them as you sum numbers in 1st-2nd grades, going backwards through them.
Also make sure you move over digits to higher register when needed (i.e. not
always when reaching 10 but when reaching 24 or 60 for hours/minutes).
So I suggest you code this algorithm yourself.