gistfile1.m

-(void)configDatePicker:(UIDatePicker *)datePicker{
    datePicker.backgroundColor = [UIColor whiteColor];
    
    // Round Default date with 15 mins interval
    NSDateComponents *dateComponents = [[NSCalendar currentCalendar] components:NSMinuteCalendarUnit fromDate:[NSDate date]];
    NSInteger minutes = [dateComponents minute];
    NSInteger minutesRounded =roundf((float)minutes / (float)30 + 0.5) * 30;
    
    NSDate *roundedDate = [[NSDate alloc] initWithTimeInterval:60.0 * (minutesRounded - minutes) sinceDate:[NSDate date]];
    [datePicker setMinimumDate:roundedDate];
    
    // Set interval
    datePicker.minuteInterval = 30;
    [datePicker addTarget:self action:@selector(updateMeetingDateTextField:) forControlEvents:UIControlEventValueChanged];
}