//JAVA日期格式

 Date date = new Date();

 SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss")

 String dateTime = dateFormat.format(date);

 //IOS日期格式

 NSDate *date = [NSDate date];

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

 formatter.dateFormatter = "@yyyy-MM-dd hh:mm:ss";

 NSString *string = [formatter stringFromDate:date];