Just a small change that would be pretty neat.

You can add 1 to the day count by using the add function, which should achieve the same thing.

Oh.

How would I go about doing that?

(Still, I’d rather this be default.)

<line>
  <str>Day </str>
  <add>
    <var>mcday</var>
    <num>1</num>
  </add>
</line>

I can ask around what other people think about it, but I believe that in the original version of IGI the first day (day 0) was considered a "preparation day", because it only lasts half a day.

Oh, I didn’t know that day 0 only lasts half a day. Well, it makes sense, as you start off in a new world in the middle of the day.