Converting between NSTimeInterval to human-readable hours and minutes

timeIntervalToHoursAndMinutes.m

#pragma mark - Common Routines

// I would prefer a standard ObjC way to do this but this is what's in place for now

static inline void timeIntervalToHoursAndMinutes(NSTimeInterval timeInterval, double *hours, double *mins)
{
    double fullMinutes = trunc(timeInterval / 60.0);
    if (hours)
    {
        *hours = trunc(fullMinutes / 60.0);
    }
    if (mins)
    {
        *mins  = trunc(fmod(fullMinutes, 60.0));
    }
}

static inline NSTimeInterval hoursAndMinutesToTimeInterval(double hours, double mins)
{
    return (hours * 60.0 + mins) * 60.0;
}

static inline NSString *formatTimeInterval(NSTimeInterval timeInterval)
{
    double hours;
    double mins;
    
    timeIntervalToHoursAndMinutes(timeInterval, &hours, &mins);
    
    return [NSString stringWithFormat:NSLocalizedString(@"%02.0fh%02.0fm", @"{# of hours}hours-abbreviation{# of minutes}minutes-abbreviation"), hours, mins];
}