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📅 Date & Time Workbench

Calculate date differences, elapsed spans, date offsets, weekend-only business-day shifts, and lookup ISO week, quarter, leap year, browser timezone, lunar, zodiac, and approximate solar-term details.

This tool handles browser-local date math: differences, elapsed spans, offsets, and date profiles. Business-day mode only skips Saturdays/Sundays; timezone and DST details come from the current browser and are not official timezone, holiday, contract, payroll, or medical guidance.

Use for birthdays, anniversaries, project durations, or record cleanup. Results are date-span math only and do not determine legal age, eligibility, insurance, school, immigration, medical, or policy outcomes.

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Date and time workbench for date differences, elapsed-time breakdowns, date offsets, weekend-only business-day shifts, and date profile lookup. Inspect total days, weeks, years/months/days spans, ISO week, quarter, leap year, browser-local timezone/DST status, Chinese lunar date, zodiac, and approximate solar terms. Inputs and results stay in the current browser; business-day mode only skips Saturdays and Sundays and does not provide holiday, payroll, contract, immigration, legal, or medical conclusions.