Module convert 

Exact numeric conversions for calendar quantities.

Date arithmetic hands back i64 day counts and u32 year/month/day components; day-count fractions and schedule maths need them as f64 or i32. Every such conversion in this crate is provably exact, but written as a bare cast it is indistinguishable from one that is not — so the casts live here, once, with the bound that makes them safe stated alongside.

Functions

count_to_f64 🔒

A count of periods as a float — a fixed leg has tens of periods, never more than a mantissa holds, so the widening is exact.

count_to_i64 🔒

Converts a count of elements to i64.

days_to_f64 🔒

Converts a whole-day count to f64.

days_to_index 🔒

Converts a non-negative day count to u32, for indexing a per-day table.

days_to_offset 🔒

Converts a non-negative day count to u64, for chrono’s Days.

months_to_offset 🔒

Converts a non-negative span in months to u32, for chrono’s Months.

seconds_to_f64 🔒

Converts an elapsed-seconds count to f64.

week_index 🔒

Converts a non-negative weekday offset to an index into a week mask.

ymd_from_i32 🔒

Converts a year, month, or day-of-month component computed in i32 back to u32.

ymd_to_i32 🔒

Converts a year, month, or day-of-month component — or a span in months — to i32.