I couldn't resist, so I went ahead and did all of them. I might be using
these in a future app anyways. Again these are Tcl procs, but you may be
able to transfer the logical to another language, if you want.
proc getTG {year} {
set di \
[clock format [clock scan $year-11-30] -format "%w"]
return [expr {30 - ((($di+1)%7)+2)}]
}
proc getMem {year} {
set di \
[clock format [clock scan $year-05-31] -format "%w"]
return [expr {31 - ((($di+6)%7))}]
}
proc getLabor {year} {
set di \
[clock format [clock scan $year-09-01] -format "%w"]
return [expr {(((8-$di)%7) + 1)}]
}
Josh Berkus wrote:
>
> Folks,
>
> I'm spec'ing a calendar app for PostgreSQL, and was wondering if anyone
> had already solved the following problem:
>
> How can I calculate the dates of American holidays?
>
> Obviously, Christmas & New Year's are easy. As is July 4.
>
> However, Thanksgiving is the last Thursday in November, unless the month
> ends on a Thursday or Friday, in which case it is the next-to-last.
> Memorial Day and Labor Day are simpler, but also use the "First or Last
> Monday in x month" idea.
>
> I was wondering if anyone had already figured out these calculations, in
> any language (SQL would be terrific).
>
> Thanks!
>
> -Josh
>
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