haxe - 错误：Void -> Int 应该是 Float 对于函数参数“num”

Question

正如我在标题中提到的那样尝试修复此错误，但无法弄清楚。我没有比较任何东西为什么我得到这个我不知道。我试图将字符串更改为浮动但没有成功。也许我应该改变 StringTools 但不确定用什么代替它。

package com.bykd.output;


@:final class DateOutput
{

    public static inline var HOUR : String = "%h";

    public static inline var MONTH : String = "%m";

    public static inline var SECOND : String = "%s"; 

    public static inline var MINUTE : String = "%i";

    public static inline var DAY : String = "%d";

    public static inline var YEAR : String = "%y";


    public function new()
    {
        //super();
    }

    public static function formatDate(date : Date, format : String) : String
    {
        var output : String = null;
        output = format;
        output = StringTools.replace(output, DAY, leadZero(date.getDay));
        output = StringTools.replace(output, MONTH, leadZero(date.getMonth));
        output = StringTools.replace(output, YEAR, date.getFullYear);
        return output;
    }

    public static function formatTime(date : Date, format : String) : String 
    {
        var output : String = null;
        output = format;
        output = StringTools.replace(output, HOUR, leadZero(date.getHours));
        output = StringTools.replace(output, MINUTE, leadZero(date.getMinutes));
        output = StringTools.replace(output, SECOND, leadZero(date.getSeconds));
        return output;
    }

    public static function leadZero(num : Float) : String
    {
        return Std.string("00" + num).substr(-2, 2);
    }
}