Chris Muller uploaded a new version of Chronology-Core to project The Inbox:
http://source.squeak.org/inbox/Chronology-Core-cmm.14.mcz

==================== Summary ====================

Name: Chronology-Core-cmm.14
Author: cmm
Time: 17 October 2018, 10:07:14.485014 pm
UUID: 5d93900c-4a4e-4a4e-80f3-800dbdb07d0b
Ancestors: Chronology-Core-tcj.12

- A fix and optimization of Timespan>>#=.  Both elements being compared must have the same timezone (or same state of #noTimezone) in order to take advantage of the optimized #hasEqualTicks: comparison.  Otherwise (if different timezones), a full comparison of their starts (via #=) is needed.
- There was a mention of this optimization put into the class comment.  This level of detail may be a bit tedious for users to read at that level, so Brents original comment was restored.

=============== Diff against Chronology-Core-tcj.12 ===============

Item was changed:
  Magnitude subclass: #Timespan
  	instanceVariableNames: 'start duration'
  	classVariableNames: ''
  	poolDictionaries: ''
  	category: 'Chronology-Core'!
  
+ !Timespan commentStamp: 'cmm 10/17/2018 22:00' prior: 0!
+ I represent a duration starting on a specific DateAndTime.!
- !Timespan commentStamp: 'bf 2/18/2016 14:43' prior: 0!
- I represent a duration starting on a specific DateAndTime.
- 
- If my start has an offset identical to my #defaultOffset then comparisons ignore timezone offset.!

Item was changed:
  ----- Method: Timespan>>= (in category 'ansi protocol') -----
  = comparand
+     ^ self class = comparand class 
+         and: [(((self noTimezone and: [comparand noTimezone]) or: [self start offset = comparand start offset])
+             ifTrue: [ self start hasEqualTicks: comparand start ]
+             ifFalse: [ self start = comparand start ])
+         and: [ self duration = comparand duration ] ]
- 	^ self class = comparand class 
- 		and: [((self noTimezone or: [ comparand noTimezone ])
- 			ifTrue: [ self start hasEqualTicks: comparand start ]
- 			ifFalse: [ self start = comparand start ])
- 		and: [ self duration = comparand duration ] ]
  .!