CreateRelease.cmd: Write the build start and end times to Build/Release/buildtime.txt.

Author: sdottaka

CreateRelease.cmd

@@ -1,3 +1,5 @@
+for /f %%a in ('powershell -command "Get-Date -Format HH:mm:ss.fff"') do set start=%%a
+
 set workdir=BuildTmp\Src
 if "%1" == "vs2017" (
   set vsversion=vs2017
@@ -50,3 +52,7 @@ call UploadToVirusTotal.cmd
 
 popd
 
+for /f %%a in ('powershell -command "Get-Date -Format HH:mm:ss.fff"') do set end=%%a
+for /f %%a in ('powershell -command "(New-TimeSpan -Start (Get-Date '%start%') -End (Get-Date '%end%')).TotalMilliseconds"') do set elapsed=%%a
+
+echo %DATE% %start%,%end%,%elapsed%[ms] >> Build\Releases\buildtime.txt