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mfgames-culture can now do calculate elapsed time between instants, format and parse it from arbitrary specs based on culture files.
This means I can annotate my chapters with a start in "1454/7/41 MTR 1::36" with either duration "4::45" or stop "1454/7/41 MTR 5:1" and it works.
Well, once I write the period format. But the big thing is it lets me document my wiki using "in world" values and have it correct. :)
It's amazing how many days of work goes into what effectively will be a tooltop.