diff --git a/Editor/BuildTool/AppBuilder.cs b/Editor/BuildTool/AppBuilder.cs
index 6e7a6e5..97e94bd 100644
--- a/Editor/BuildTool/AppBuilder.cs
+++ b/Editor/BuildTool/AppBuilder.cs
@@ -346,7 +346,7 @@ namespace Guru.Editor
 	    private static string ChangeBuildNumber(BuildTarget buildTarget)
 	    {
 		    var nowDate = DateTime.Now;
-		    string strBuildNumber = $"{nowDate.Year - 2000}{nowDate.Month:00}{nowDate.Day:00}{(nowDate.Hour * 60 + nowDate.Minute) / 15}";
+		    string strBuildNumber = $"{nowDate.Year - 2000}{nowDate.Month:00}{nowDate.Day:00}{((nowDate.Hour * 60 + nowDate.Minute) / 15):00}";
 		    int buildNumber = int.Parse(strBuildNumber);
 		    if (buildTarget == BuildTarget.iOS)
 		    {