Question

How can I show a countdown in HH:mm:ss format from NOW to a desired NSDate that will happen in the future?

Answer 1

You have to use a timer for ticking the date.

Store a future date, and keep on substracting future date – [nsdate today]…

Calculate the time in seconds and calculate it into Hours, minutes, seconds…

//Make two properties NSDate *nowDate, *futureDate

futureDate=...;

nowDate=[NSDate date];

long elapsedSeconds=[nowDate timeIntervalSinceDate:futureDate];
NSLog(@"Elaped seconds:%ld seconds",elapsedSeconds);

NSInteger seconds = elapsedSeconds % 60;
NSInteger minutes = (elapsedSeconds / 60) % 60;
NSInteger hours = elapsedSeconds / (60 * 60);
NSString *result= [NSString stringWithFormat:@"%02ld:%02ld:%02ld", hours, minutes, seconds];

This will come handy for you…kindly check the project…