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.