diff --git a/build-ryzjsext.bat b/build-ryzjsext.bat
new file mode 100644
index 0000000..e0c65ac
--- /dev/null
+++ b/build-ryzjsext.bat
@@ -0,0 +1,14 @@
+del ryzjsext.min.js
+del ryzjsext.min.tmp
+
+type ryzjsext-version.txt >> ryzjsext.min.js
+
+cd javascript-extensions
+
+"C:\B\Portable Files (dev)\Google Closure Compiler\closure-compiler-v20231112.jar" --js *.js --js_output_file ../ryzjsext.min.tmp
+
+cd..
+
+type ryzjsext.min.tmp >> ryzjsext.min.js
+
+del ryzjsext.min.tmp
\ No newline at end of file
diff --git a/ryz-js-ext/ryz-js-ext-array.js b/javascript-extensions/ryz-js-ext-array.js
similarity index 100%
rename from ryz-js-ext/ryz-js-ext-array.js
rename to javascript-extensions/ryz-js-ext-array.js
diff --git a/ryz-js-ext/ryz-js-ext-boolean.js b/javascript-extensions/ryz-js-ext-boolean.js
similarity index 100%
rename from ryz-js-ext/ryz-js-ext-boolean.js
rename to javascript-extensions/ryz-js-ext-boolean.js
diff --git a/ryz-js-ext/ryz-js-ext-date.js b/javascript-extensions/ryz-js-ext-date.js
similarity index 100%
rename from ryz-js-ext/ryz-js-ext-date.js
rename to javascript-extensions/ryz-js-ext-date.js
diff --git a/ryz-js-ext/ryz-js-ext-document.js b/javascript-extensions/ryz-js-ext-document.js
similarity index 100%
rename from ryz-js-ext/ryz-js-ext-document.js
rename to javascript-extensions/ryz-js-ext-document.js
diff --git a/ryz-js-ext/ryz-js-ext-math.js b/javascript-extensions/ryz-js-ext-math.js
similarity index 100%
rename from ryz-js-ext/ryz-js-ext-math.js
rename to javascript-extensions/ryz-js-ext-math.js
diff --git a/ryz-js-ext/ryz-js-ext-string.js b/javascript-extensions/ryz-js-ext-string.js
similarity index 100%
rename from ryz-js-ext/ryz-js-ext-string.js
rename to javascript-extensions/ryz-js-ext-string.js
diff --git a/ryz-js-ext/ryz-js-ext-window.js b/javascript-extensions/ryz-js-ext-window.js
similarity index 100%
rename from ryz-js-ext/ryz-js-ext-window.js
rename to javascript-extensions/ryz-js-ext-window.js
diff --git a/ryz-gantts.js b/ryz-gantts.js
index 1e87f64..94ef031 100644
--- a/ryz-gantts.js
+++ b/ryz-gantts.js
@@ -280,6 +280,31 @@ class RyzGantt {
       }
     }
 
+    // Calculate work-hours
+    for (var i=0; i<result.length; i++) {
+      if (result[i].StartDate == null) {
+        continue;
+      }
+
+      if (result[i].FinishDate == null) {
+        continue;
+      }
+
+      if (result[i].Duration <= 0) {
+        continue;
+      }
+
+      let workHours = 0;
+      let date = new Date(result[i].StartDate);
+      for (let i=0; i<result[i].Duration; i++) {
+        const d = date.getDay();
+
+        workHours += a.Project.WorkHours[d];
+      }
+
+      result[i].CalcWorkHours = workHours;
+    }
+
     return isSuccess;
   }
 
diff --git a/ryzjsext-test.html b/ryzjsext-test.html
index 2185d8d..b399229 100644
--- a/ryzjsext-test.html
+++ b/ryzjsext-test.html
@@ -7,7 +7,7 @@
   <meta name="description" content="" />
   <meta name="keyword" content="" />
 
-  <script src="ryjsxt.js"></script>
+  <script src="ryzjsext.min.js"></script>
   <!-- <script src="bsdialog4.min.js"></script> -->
   <title></title>
 
diff --git a/ryzjsext-version.txt b/ryzjsext-version.txt
new file mode 100644
index 0000000..5db3d74
--- /dev/null
+++ b/ryzjsext-version.txt
@@ -0,0 +1,4 @@
+/**
+ * Ray's JavaScript Extension
+ * @version v0.1.0.051 (2023/12/24 0115)
+ */
diff --git a/ryzjsext.min.js b/ryzjsext.min.js
index b3c4306..4c62448 100644
--- a/ryzjsext.min.js
+++ b/ryzjsext.min.js
@@ -1,4 +1,17 @@
 /**
  * Ray's JavaScript Extension
- * @version v0.1.0.021 (2023/12/11 0056)
+ * @version v0.1.0.051 (2023/12/24 0115)
  */
+Array.prototype.addRange=function(a){if(null==a)return this;for(let b=0;b<a.length;b++)this.push(a[b]);return this};Array.prototype.any=function(a,b){return 0<this.count(a,b)};Array.prototype.copy=function(){return JSON.parse(JSON.stringify(this))};Array.prototype.count=function(a,b){let c=0;for(let d=0;d<this.length;d++)"undefined"!=typeof this[d][a]&&this[d][a]==b&&c++;return c};Array.prototype.countMany=function(...a){let b=0;a.forEach(c=>{b+=this.count(c.propName,c.value)});return b};
+Array.prototype.index=function(a,b){for(let c=0;c<this.length;c++)if("undefined"!=typeof this[c][a]&&this[c][a]==b)return c;return-1};Array.prototype.insert=function(a,b){0>a?this.splice(0,0,b):a>=this.length?this.push(b):this.splice(a,0,b);return this};Array.prototype.joinIfNotNullOrWhitespace=function(a){let b="";for(let c=0;c<this.length;c++)String.isNullOrWhitespace(this[c])||(String.isNullOrWhitespace(b)||(b+=a),b+=this[c]);return b};
+Array.prototype.first=function(a,b){for(let c=0;c<this.length;c++)if("undefined"!=typeof this[c][a]&&this[c][a]==b)return this[c];return null};Array.prototype.indexes=function(a,b){let c=[];for(let d=0;d<this.length;d++)"undefined"!=typeof this[d][a]&&this[d][a]==b&&c.push(d);return c};Array.prototype.orderBy=function(a){this.sort(function(b,c){return b[a]<c[a]?-1:b[a]>c[a]?1:0});return this};Array.prototype.orderByDesc=function(a){this.sort(function(b,c){return b[a]<c[a]?1:b[a]>c[a]?-1:0});return this};
+Array.prototype.remove=function(a){let b=[];for(let c=0;c<this.length;c++)this[c]==a&&b.push(c);for(a=b.length-1;0<=a;a--)this.removeAt(b[a]);return this};Array.prototype.removeAt=function(a){if(0>a||a>=this.length)return this;this.splice(a,1);return this};Array.prototype.removeRange=function(a){for(let b=0;b<a.length;b++)this.remove(a[b]);return this};Array.prototype.select=function(a,b){let c=[];for(let d=0;d<this.length;d++)"undefined"!=typeof this[d][a]&&this[d][a]==b&&c.push(this[d]);return c};
+Array.prototype.selectMany=function(...a){let b=this;a.forEach(c=>{b=b.select(c.propName,c.value)});return b};Boolean.isFalse=function(a){return String.isNullOrUndefined(a)?!0:a.toString().containsCI("false","f","y","0","x")};Boolean.isTrue=function(a){return String.isNullOrUndefined(a)?!1:a.toString().containsCI("true","t","n","1","o")};Boolean.ifTrue=function(a,b,c){return Boolean.isTrue(a)?b:c};Date.addDays=function(a,b){a=new Date(a);a.addDays(b);return a};Date.addMonths=function(a,b){a=new Date(a);a.addMonths(b);return a};Date.addYears=function(a,b){a=new Date(a);a.addYears(b);return a};Date.today=function(){let a=new Date;a.setHours(0);a.setMinutes(0);a.setSeconds(0);a.setMilliseconds(0);return a};Date.prototype.addDays=function(a){this.setDate(this.getDate()+parseInt(a))};Date.prototype.addMonths=function(a){this.setMonth(this.getMonth()+parseInt(a))};
+Date.prototype.addYears=function(a){this.setFullYear(this.getFullYear()+parseInt(a))};
+Date.prototype.toCString=function(a){a=a.replace("fffffff",this.getMilliseconds().toString().padStart(7,"0"));a=a.replace("ffffff",this.getMilliseconds().toString().padStart(6,"0"));a=a.replace("fffff",this.getMilliseconds().toString().padStart(5,"0"));a=a.replace("yyyy",this.getFullYear().toString().padStart(4,"0"));a=a.replace("MMMM","{1}");a=a.replace("dddd","{2}");a=a.replace("ffff",this.getMilliseconds().toString().padStart(4,"0"));a=a.replace("yyy",this.getFullYear().toString().padStart(3,"0"));
+a=a.replace("MMM","{3}");a=a.replace("ddd","{4}");a=a.replace("fff",this.getMilliseconds().toString().padStart(3,"0"));a=a.replace("zzz","");a=a.replace("yy",this.getFullYear().toString().slice(-2));a=a.replace("MM",(this.getMonth()+1).toString().padStart(2,"0"));a=a.replace("dd",this.getDate().toString().padStart(2,"0"));a=a.replace("HH",this.getHours().toString().padStart(2,"0"));a=a.replace("hh",(12<this.getHours()?this.getHours()-12:this.getHours()).toString().padStart(2,"0"));a=a.replace("mm",
+this.getMinutes().toString().padStart(2,"0"));a=a.replace("ss",this.getSeconds().toString().padStart(2,"0"));a=a.replace("ff",this.getMilliseconds().toString().padStart(2,"0"));a=a.replace("tt","{5}");a=a.replace("zz","");a=a.replace("y",this.getFullYear().toString());a=a.replace("M",(this.getMonth()+1).toString());a=a.replace("d",this.getDate().toString());a=a.replace("H",this.getHours().toString());a=a.replace("h",(12<this.getHours()?this.getHours()-12:this.getHours()).toString());a=a.replace("m",
+this.getMinutes().toString());a=a.replace("s",this.getSeconds().toString());a=a.replace("z","");a=a.replace("t","{6}");a=a.replace("Z","");a=a.replace("{1}",this.toLocaleString("default",{month:"long"}));a=a.replace("{2}",this.toLocaleString("default",{weekday:"long"}));a=a.replace("{3}",this.toLocaleString("default",{month:"short"}));a=a.replace("{4}",this.toLocaleString("default",{weekday:"short"}));a=a.replace("{5}",12<=this.getHours()?"PM":"AM");return a=a.replace("{6}",12<=this.getHours()?"P":
+"A")};Document.ready=async function(a){(async function(){"loading"!==document.readyState?a():document.addEventListener("DOMContentLoaded",function(){a()})})()};Math.randomN=function(a,b){a=Math.ceil(a);b=Math.floor(b);return Math.floor(Math.random()*(b-a)+a)};String.isNullOrUndefined=function(a){return"undefined"==typeof a||null==a?!0:!1};String.isNullOrWhitespace=function(a){return String.isNullOrUndefined(a)?!0:"string"==typeof a?0>=a.trim().length:0>=a.toString().trim().length};String.joinIfNotNullOrWhitespace=function(a,...b){let c="";for(let d=0;d<b.length;d++)String.isNullOrWhitespace(b[d])||(String.isNullOrWhitespace(c)||(c+=a),c+=b[d]);return c};String.prototype.contains=function(...a){for(let b of a)if(this==b)return!0;return!1};
+String.prototype.containsCI=function(...a){for(let b of a)if(this.toLowerCase()==b.toLowerCase())return!0;return!1};String.prototype.encodeHtmlLinks=function(){return value.replace(/(http[s]{0,1}:\/\/[^\s]+)/g,"<a href='$1'>$1</a>")};String.prototype.toTitleCase=function(){let a;a=this.replace(/([A-Z]{1})/g," $1");a=a.trim();return a=a.charAt(0).toUpperCase()+a.substr(1)};String.prototype.getFilename=function(){return this.substring(this.lastIndexOf("/")+1)};Window.goToTop=function(){Window.scrollTo(0,0)};
+Window.fragment={get:function(){if(!window.location.hash)return null;const a=window.location.hash.indexOf("?");return 0>a?window.location.hash.substring(1):window.location.hash.substring(1,a)},getQuery:function(){if(!window.location.hash)return null;var a=window.location.hash;a=a.indexOf("?");if(0>a)return null;a=hasQueryString.substring(a+1);a=new URLSearchParams(a);const b={};for(const [c,d]of a.entries())b[c]=d;return b},clear:function(){location.hash="";history.replaceState("","",location.pathname)}};