The WINDOW option sets the value for the w window argument
used in various date-related built-in functions.

.-1950-.
>>-WINDOW--(--+-w----+--)--------------------------------------><
- w
- Either an unsigned integer that represents the start of a fixed
window or a negative integer that specifies a "sliding" window.
For example, WINDOW(-20) indicates a window that starts
20 years prior to the year when the program runs.
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