Template:Diff days/doc

This template calculates the date/time difference between two dates in days shown in decimal form. 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.

Syntax
There are two positional arguments: date1 and date2; both are required

The result displays text representing the time interval from date1 to date2 (date2 − date1) in decimal notation of precision which defaults to 3; precision accepts an integer from 0 to 99.

date1 and date2 are timezone agnostic when timezone not specified; date1 and date2 may have timezone specifiers:

Each date can include an era or a time, and a variety of formats are accepted. Examples of valid dates are:
 * 1900-02-01
 * 1900-2-1
 * 1900-02-01 14:45
 * 1 FEB 1900
 * February 1, 1900
 * February 1 1900 14:45
 * 2:45 pm February 1 1900
 * 1 February 1900 2:45 p.m.
 * BC 1 Feb 120

If the result is to include a specific no. of decimal places, add another parameter precision which defaults to 3 and accepts any integer from 0 to 99: