Timeline of regulations and rules changes

[frankenfrank]

This thread is about d changes in d regulations and rules and when , where , how and y they took place .

4 example , I was in4med 2day , that d last 15 rds title fight was held @ 1997 :
BoxRec Boxing Records

my questions 4 a start r :
When were d deadlines 4 weighins changed?
How long b4 d fight did d weighin take place b4 ?

i read about same day , but how much time b4 d fight is "same day"?

2day it is 24 hours , correct ?

and when did it change ?

and what was b4 it ? immedi8ly prior d entrance 2d ring ?

1 of my questions (put) in other words : when was d last time that "same day weigh in" took place and how much time b4 d fight did "same day" mean ?