On Wed, 25 Apr 2018 02:21:35 -0500, Norbert Friemel <[email protected]> wrote:

>On Tue, 24 Apr 2018 03:31:15 -0500, Giliad Wilf wrote:
>
>>
>>Here, IDT started Friday, March 23rd, 2am and will end Sunday, October 28th, 
>>2am, so, if I specify...
>>
>>IST-2IDT,M3.4.5,M10.5.0
>>
>
>M3.5.5 in 2019 (and 2024, 2030, ...) (5th Friday)
>
>Norbert Friemel
>

Right, thank you, this may have to be modified from time to time.
Seems there should have been a more generalized, better convention for 
specifying back and forth daylight switching. Sigh.
 
Many thanks to all who contributed insights.

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