Convert NSNumber (double) value into time

Question

Hey all,

i try to convert a value like "898.171813964844" into 00:17:02 (hh:mm:ss).

How can this be done in objective c?

Thanks for help!

Answer 1

1. Convert your NSNumber value to a NSTimeInterval with -doubleValue
2. Convert your NSTimeInterval value to a NSDate with +dateWithTimeIntervalSinceNow:
3. Convert your NSDate to a NSString with -descriptionWithCalendarFormat:timeZone:locale:

Answer 2

Assuming you are just interested in hours, minutes and seconds and that the input value is less or equal 86400 you could do something like this:

NSNumber *theDouble = [NSNumber numberWithDouble:898.171813964844];

int inputSeconds = [theDouble intValue];
int hours =  inputSeconds / 3600;
int minutes = ( inputSeconds - hours * 3600 ) / 60; 
int seconds = inputSeconds - hours * 3600 - minutes * 60; 

NSString *theTime = [NSString stringWithFormat:@"%.2d:%.2d:%.2d", hours, minutes, seconds];

Answer 3

Final solution:

NSNumber *time = [NSNumber numberWithDouble:([online_time doubleValue] - 3600)];
NSTimeInterval interval = [time doubleValue];    
NSDate *online = [NSDate date];
online = [NSDate dateWithTimeIntervalSince1970:interval];    
NSDateFormatter *dateFormatter = [[[NSDateFormatter alloc] init] autorelease];
[dateFormatter setDateFormat:@"HH:mm:ss"];

NSLog(@"result: %@", [dateFormatter stringFromDate:online]);