`val to_date_and_span_since_start_of_day : Core_kernel__Time_ns.t ‑> Core_kernel__.Date0.t * Core_kernel__Time_ns.Span.t`

`to_date_and_span_since_start_of_day` computes the date and intraday-offset of a time in UTC. It may be slower than `Core.Time_ns.to_date_ofday`, as this function does not cache partial results while the latter does.

`val of_date_and_span_since_start_of_day : Core_kernel__.Date0.t ‑> Core_kernel__Time_ns.Span.t ‑> Core_kernel__Time_ns.t`

The inverse of `to_date_and_span_since_start_of_day`.