I've been asked to post a verse I composed on a spreadsheet for constructing
a vertical decliner.   Here it is, in a slightly revised version:

        On September one, trust the sun.
        Come Halloween, subtract sixteen.
        On Christmas Day, you're OK.
        For your Valentine true, add a dozen and two.

        When taxes are due, the dial is true.
        At the mid of May, take four away.
        On June fourteen, don't add a bean.
        When August begins, add seven little mins.

        The rest is easy: for any date,
        All you do is interpolate.

The line about taxes works for USA.  A more universal alternate might run,

        The mid of month four, add no more.

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