Date-counting bugs I test before shipping a deadline calculator

Short summary

When building deadline calculators, test edge cases around business days, holidays, and start date counting to avoid silent failures. The author provides a practical checklist and reference implementation that make date logic transparent and auditable instead of hiding uncertainty. Key lesson: make rule choices explicit, show the calculation path, and include disclaimers because calculators assist but cannot replace local legal requirements.

• •Decide whether start date counts; separate calendar days from business/court days
• •Test exceptions explicitly and show skipped dates so results are auditable
• •Include disclaimers and keep holiday rules visible rather than pretending certainty

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