Pharo Issue Tracker - Manuscript (Case [Issue]21569) Kernel - DateAndTime should not use respondsTo logic in minus operation

Manuscript Notification

	Denis Kudryashov opened Case 21569: DateAndTime should not use respondsTo logic in minus operation and assigned it to Everyone: Cleanup in Kernel: 1. Pharo Image • You are subscribed to this case

This is ugly logic:
<code>
DateAndTime>>- operand
"operand conforms to protocol DateAndTime or protocol Duration"

^ (operand respondsTo: #asDateAndTime)
ifTrue: [
| other |
other := operand asDateAndTime.
Duration
seconds: (SecondsInDay * (julianDayNumber - other julianDayNumberUTC))
+ (seconds - other secondsSinceMidnightUTC)
nanoSeconds: nanos - other nanoSecond ]
ifFalse: [ self + operand negated ]
</code>
We should just use double dispatch.

	Priority: 5 – Fix If Time		Status: Work Needed
	Assigned to: Everyone		Milestone: Pharo7.0

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