Std.Time.Format.daysFromCivil

fn

This is a callable function.

What it does

The day number a civil date stands on, counting from the start of 1970.

The calendar repeats exactly every four hundred years, so a date is placed

by counting whole cycles and then the position within one. That is what

makes this arithmetic rather than a table, and what makes it as correct in

the year 3000 as in this one.

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