@echo off

setlocal EnableDelayedExpansion

set projectName=%~1

set projectName=!projectName: =!

rem echo [Project Name: !projectName!]

rem This variable isn't available until the next terminal session

rem set starttime=!%projectName%_BuildStartTime!

rem Use a really, really big hammer

for /f "delims=" %%i in ('powershell -Command "& { [Environment]::GetEnvironmentVariable(\"%projectName%_BuildStartTime\", \"User\")}"') do set starttime=%%i

rem cleanup

powershell -Command "& {[Environment]::SetEnvironmentVariable(\"%projectName%_BuildStartTime\", $null, \"User\")"}

rem echo [Start time: !starttime!]

set "starttime=!starttime: =0!"

set "endTime=%time: =0%"

rem Convert times to integers for easier calculations

for /F "tokens=1-4 delims=:.," %%a in ("%STARTTIME%") do (

set /A "start=(((%%a*60)+1%%b %% 100)*60+1%%c %% 100)*100+1%%d %% 100"

)

for /F "tokens=1-4 delims=:.," %%a in ("%ENDTIME%") do (

IF %ENDTIME% GTR %STARTTIME% set /A "end=(((%%a*60)+1%%b %% 100)*60+1%%c %% 100)*100+1%%d %% 100"

IF %ENDTIME% LSS %STARTTIME% set /A "end=((((%%a+24)*60)+1%%b %% 100)*60+1%%c %% 100)*100+1%%d %% 100"

)

rem Calculate the elapsed time

set /A elapsed=end-start

rem Convert back to hr, min, sec

set /A hh=elapsed/(60*60*100), rest=elapsed%%(60*60*100), mm=rest/(60*100), rest%%=60*100, ss=rest/100, cc=rest%%100

if %hh% lss 10 set hh=0%hh%

if %mm% lss 10 set mm=0%mm%

if %ss% lss 10 set ss=0%ss%

if %cc% lss 10 set cc=0%cc%

set DURATION=%hh%:%mm%:%ss%.%cc%

rem echo ------ !projectName! build start at !starttime! -----

echo ------ !projectName! build complete at !endTime! -----

echo Build duration : %DURATION%