Yet. Some interactive fiction tracks turns, some track time (where 1 turn often equals 1 minute), some track neither. StupidRPG currently tracks turns (internally) but not time. I don’t currently have any plans to add a dynamic day-night cycle (though it might show up on the Wish List), and time of day is not generally relevant to any of the mechanics.
That said, time (tracked or not) will pass for story reasons. In Act II, the player returns to a familiar region, now at night. Since this is mostly a descriptive element, I’d also like to tie the background art into the change to help sell the feeling. I’m tempted to experiment with a larger style overhaul (text/background colors), but I don’t want to disrupt the player too much.
If I do decide to pursue a day-night cycle, Act III (which contains a ‘living’ town) will be the testing ground. That’s a major undertaking, however. I’m not making Majora’s Mask here.