Time between dates
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The exact time between two dates in every unit that matters, plus a visual calendar of both dates.
This walks month by month between your two dates for a calendar-accurate breakdown, then re-expresses that same span as total months, weeks, days, hours, minutes, and seconds — since payroll, a science project, and a legal document all want a different unit. The calendar view shows exactly which month each date falls in.
difference = end date − start date, normalized to Y / M / D, then re-expressed in every other unit