Convert string to time (not date) [duplicate]

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Closed 8 years ago.

Possible Duplicate:
hours minutes seconds to seconds ios

I have a time formatted as such

// format: HH:mm:ss,AAA
// example for 2 hours, 35 minutes, 15 seconds, and 207 milliseconds
02:35:15,207

I'm trying to convert that into seconds as a double. The above example would turn into:

// 2 hrs * 3600 + 25 min * 60 + 15.207
9315.207

I figure I can pick apart each element with a scanner, but I'm thinking there's probably an easier way. I tried using NSDateFormatter but I need this as a double, not as an NSDate. Any suggestions? Thanks.

Further FYI

This is for use with the MPMoviePlayer and the currentTime property is a double. For any given section where I have data to show, I am checking if dataStartTime <= playerTime < dataEndTime. So I'm using double because that's the type for currentTime already.

Answer 1

Here is the solution, the idea is simple get two date one with your time and one with 00:00:00,000 time then take difference of their time.

- (double)secondsFromString:(NSString*)str {
    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    [formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss,SSS"];
    NSString *dateString = @"1970-01-01";
    NSDate *date = [formatter dateFromString:[NSString stringWithFormat:@"%@ %@",dateString,str]];
    NSDate *refDate = [formatter dateFromString:[NSString stringWithFormat:@"%@ 00:00:00,000",dateString]];
    double time = [date timeIntervalSince1970] - [refDate timeIntervalSince1970];
    return time;
}