CODEWITHSUNDEEP
objective-ccocoansnumber
SonnyBurnette
SonnyBurnette

Reputation: 680

NSNumber of seconds to Hours, minutes, seconds

I am having a terrible time trying to do something that should be easy. I have a NSNumber value of 32025.89 seconds. I need to represent that in Hours, Minutes, Seconds. Is there a method that spits that out? I can't seem to find a proper formatter.

Upvotes: 5

Views: 13975

Answers (4)

Thomas Müller
Thomas Müller

Reputation: 15625

Have you tried creating an NSDate from that and printing that using an NSDateFormatter?

NSDate *date = [NSDate dateWithTimeIntervalSince1970:[theNumber doubleValue]];
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"HH:mm:ss"];
NSLog(@"%@", [formatter stringFromDate:date]); 
[formatter release];

If you need the individual values for hours, minutes, and seconds, use NSDateComponents as suggested by nall.

The above won't print the correct amounts if the NSNumber represents more than one day. It could be 1 day and 1 hour, and it would only print 01:00:00. In such a case you should calculate hours, minutes and seconds manually.

Upvotes: 8

taus-iDeveloper
taus-iDeveloper

Reputation: 701

NSNumber *valueForDisplay = [NSNumber numberWithDouble: [self valueForDisplay:clockName]];

NSNumber *totalDays = [NSNumber numberWithDouble:
         ([valueForDisplay doubleValue] / 86400)];
NSNumber *totalHours = [NSNumber numberWithDouble:
         (([valueForDisplay doubleValue] / 3600) -
          ([totalDays intValue] * 24))];
NSNumber *totalMinutes = [NSNumber numberWithDouble:
         (([valueForDisplay doubleValue] / 60) -
         ([totalDays intValue] * 24 * 60) -
         ([totalHours intValue] * 60))];
NSNumber *totalSeconds = [NSNumber numberWithInt:
         ([valueForDisplay intValue] % 60)];

Upvotes: 2

Nick Bedford
Nick Bedford

Reputation: 4435

Here's a way without any libraries except for modf() from math.h:

float fsec = 32025.89f, frac = 0;
int milliseconds = (int)(modf(fsec, &frac) * 1000);
int isec = (int)frac;
int hours = isec / 3600;
int minutes = (isec % 3600) / 60;
int seconds = isec % 60;

Upvotes: 4

nall
nall

Reputation: 16139

If you don't want to just divide it out, try this. It may be close enough for your purposes. Note: It doesn't account for sub-second precision. (setSecond takes an NSInteger).

NSDateComponents* c = [[[NSDateComponents alloc] init] autorelease];
[c setSecond:32025.89];

NSCalendar* cal = [[[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar]
                   autorelease];

NSDate* d = [cal dateFromComponents:c];

NSDateComponents* result = [cal components:NSHourCalendarUnit |
                                           NSMinuteCalendarUnit |
                                           NSSecondCalendarUnit
                                  fromDate:d];

NSLog(@"%d hours, %d minutes, %d seconds",
    [result hour], [result minute], [result second]);

Upvotes: 9

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