[PW] An obscurity in Scottish Law

[Peter Zilahy Ingerman, PhD]

This is for me, as a logical consequence of my passion for calendrics, 
but I have exhausted all of my resources, and haven't found an answer. 
Might there be a Womb at t who can help?

The question:

Prior to 1990, the "Scottish term days" were Feb 2, May 15, Aug 1, and 
Nov 11.

However, apparently the Term & Quarter Days (Scotland) Act 1990 
redefined these to be Feb 28, May 28, Aug 28, and Nov 28.

But nothing I've found defines the edge condition ... on what date did 
the new term dates come into effect? It makes a difference, in the sense 
that one term ... the one containing the change date ... will have to be 
either longer or shorter than normal, to make the adjustment.  

Yes, I know I'm obsessed ... but things like this do keep me up nights!

Peter Ingerman