Date Calculator is a single-page browser tool for comparing two dates and understanding the span between them at a glance. It breaks the range into total days, weeks, business days, and weekend days, and it also shows a visual timeline so you can see where the selected dates fall relative to today.
All thanks and kudos to Simon Willison; inspired by HTML tools and the simonw/tools repo, licensed under Apache License, Version 2.0, January 2004.
Open day_calculator.html in your browser, choose the two dates you want to compare, and review the detailed breakdown and timeline summary.
This project is licensed under the MIT License.
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This tool was vibe-coded with AI with strict human supervision.