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Vinony files it under Date-computing templates, Lua-based templates and Time, date and calendar templates.
Vinony links it to 47 Wikipedia language editions.
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This template calculates the date/time difference between two dates. Dates in the Gregorian calendar from 9999 BCE to 9999 CE are supported. The calendar is proleptic—it is assumed to apply at all times with no irregularities.
Excerpted from Wikipedia’s “Template:Time interval” article, available under the CC BY-SA 4.0 licence.