GM_build_date;
Returns: Real
This constant holds the date and time on which the executable
being run was built by GameMaker: Studio. The value can be
parsed using the Date and
Time functions and is taken from the system UTC value at
compile time.
draw_text(32, 32,
date_time_string(GM_build_date));
draw_text(32, 64, "v" + GM_version);
The above code will draw the version number for the game and the date and time it was compiled on.