Post #3992 by Ebbtide on the Mechanical Investing board

Investment Strategies / Mechanical Investing

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... the recent addition of a new holiday(6/19) ...

I noticed recently that this holiday affects the common assumption that there are 252 (or 252 plus a little) trading days per 12-month period. So maybe annualizing backtest results should use 251 (or 251 plus a little) trading days per 12-month period for recent periods. Calendar 2022 is the first year affected. Calendar 2022, 2023 and 2024 show 251, 250 and 252 trading days. (2024 was a leap year.) No big deal for long-term backtests, especially since early years (back to the 1930s) often had weird numbers of trading days anyway.

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