On 2018-09-26 22:35, Dianne Skoll wrote:
> Tim Chase <[email protected]> wrote:
>
> > I'm trying to figure out how to specify "the first weekend of each
> > month" (defined as the first Saturday of the month and the Sunday
> > that follows it).
>
> The trick is to realize the following equivalence:
>
> "The Sunday after the first Saturday in a month" is exactly the
> same as: "The Sunday on or after the 2nd of the month"
After sufficient banging my head against it, I came a similar
solution shortly before your reply arrived:
REM Sat Sun 2019 +1 UNTIL Jan 1 2020 SATISFY [ \
($Tw == 6 && $Td < 8) \
|| ($Tw == 0 && $Td > 1 && $Td < 9) \
] MSG %"Weekend to work%" %b%
(the UNTIL is there since I only have the work schedule for 2019,
subject to change beyond that).
> Spend a bit of time to convince yourself of that equivalence...
It took a bunch of shell-scripting tests for various dates to make
sure I had all the weird edge cases, but this was just what I
needed.
(SATISFY is a great swiss-army-knife for whacking problems in a way
that fits my mind.)
Thanks!
-tim
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