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Editorial Team
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Asked: 2026-06-05T12:57:01+00:00

The task at hand is pretty simple — convert NSTimeInterval to NSString that looks

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The task at hand is pretty simple — convert NSTimeInterval to NSString that looks like 12:34:56 (for 12 hours, 34 minutes and 56 seconds).

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1 Answer

  1. Editorial Team

    Here’s a faster version of @golegka’s answer:

    NSString *stringFromInterval(NSTimeInterval timeInterval)
{
#define SECONDS_PER_MINUTE (60)
#define MINUTES_PER_HOUR (60)
#define SECONDS_PER_HOUR (SECONDS_PER_MINUTE * MINUTES_PER_HOUR)
#define HOURS_PER_DAY (24)

    // convert the time to an integer, as we don't need double precision, and we do need to use the modulous operator
    int ti = round(timeInterval);

    return [NSString stringWithFormat:@"%.2d:%.2d:%.2d", (ti / SECONDS_PER_HOUR) % HOURS_PER_DAY, (ti / SECONDS_PER_MINUTE) % MINUTES_PER_HOUR, ti % SECONDS_PER_MINUTE];

#undef SECONDS_PER_MINUTE 
#undef MINUTES_PER_HOUR
#undef SECONDS_PER_HOUR
#undef HOURS_PER_DAY
}

    This doesn’t mess around with NSCalendars, it just uses straight integer math.

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