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Date Calculator

Calculate working days between dates without a spreadsheet formula.

Calculating working days, adding durations, or handling timezones meant reaching for spreadsheet formulas or a clunky calculator site.

Tech Domain · Book Dev|Published|Evidence: Live|Next.js, TypeScript

A public deployment is available to try.

Case Study

Before

Calculating working days between dates, adding durations to specific dates, and handling timezone differences required spreadsheet formulas or clunky online calculators.

After

Provided instant date arithmetic for project planning, deadline calculation, and contract period computation. The working day calculator handles holiday calendars for accurate business date math.

How it's solved

Built a date calculator with difference calculation (calendar days, working days, weeks), duration addition/subtraction, and timezone-aware results. Supports business day exclusion of holidays.

Trade-offs

Holiday calendars are pre-set for supported regions — a custom or less common holiday calendar isn't accounted for automatically.

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