[CMake] [CMAKE] Getting compilation date through CMake

[Jon Haitz Legarreta]

Hi there,
I was trying to get the compilation time through a CMake-executed command
in order to know the compilation time of a given project.
In my custom.cmake file I was using

execute_process(COMMAND
    date -t
    OUTPUT_VARIABLE _output
)

It turns out that the _output variable is empty when I compile my project.
However, the command works well from the command line. I'm working on a Win
7  64-bit machine.

I wanted to avoid using an extra C/C++ code file to get the current time.

Am I missing something?

Thank you,
JON HAITZ
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