New Holiday function to check if a week day is a holiday

We released the following

Returns TRUE (1) if weekday is a holiday, FALSE (0) otherwise. Use negative values to check for upcoming holidays. (Note: It doesn’t support checking future dates.)

For example, when you run the screener with an as-of date of 7/1/2023 Holiday(-2) returns TRUE for Labor Day on Tuesday.

Note that it only works in the past, not current screens.


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