How to get a UNIVERSAL Windows batch file timestamp

Question

I\'m having trouble generating a timestamp in a Windows batch file, because I get diferent date formats on different Windows versions.

My machine:

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Answer 1

As I have posted in here: Batch: Timestamp to UNIX Time

What about simple 1-line long C program returning UNIX timestamp? You can retrieve value from %errorlevel% in batch script.

#include 
#include 

int main(void)
{
    return (int) time(NULL);
}

In my test in command prompt it worked:

C:\Users\dabaran\Desktop\cs50\src\C>.\time || echo %errorlevel% && set mytstamp=%errorlevel%
1419609373

C:\Users\dabaran\Desktop\cs50\src\C>echo %mytstamp%
1419609373