获取系统时间 精确到毫秒 iphone

NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];

[dateFormatter
setDateStyle:NSDateFormatterMediumStyle];

[dateFormatter
setTimeStyle:NSDateFormatterShortStyle];

//[dateFormatter
setDateFormat:@"hh:mm:ss"]

[dateFormatter
setDateFormat:@"yyyy-MM-dd HH:mm:ss.SSS"];

NSLog(@"Date%@",
[dateFormatter stringFromDate:[NSDate date]]);

[dateFormatter
release];