2026-03-20 · 6 min read
How to Calculate Business Days in Excel
Learn practical formulas for counting workdays, skipping holidays, and avoiding common spreadsheet mistakes.
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Deep-dive tutorials designed for long-tail questions, with links to calculators so you can apply each concept instantly.
2026-03-20 · 6 min read
Learn practical formulas for counting workdays, skipping holidays, and avoiding common spreadsheet mistakes.
Read article →2026-03-20 · 5 min read
A clear explanation of ISO-8601 week rules, why week 1 can start in the prior year, and how to avoid reporting errors.
Read article →2026-03-20 · 7 min read
Understand Naegele’s rule, ultrasound adjustments, and why due dates are estimates—not exact delivery predictions.
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