NSDate时间字符串的互相转换

1. NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
2. [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
3. NSString *strDate = [dateFormatter stringFromDate:[NSDate date]];

1. NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
2. [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
3. NSDate *date = [dateFormatter dateFromString:@"2010-08-04 16:01:03"];