val to_date_and_span_since_start_of_day : t->Core_kernel__Date0.t * 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->Span.t->t
The inverse of to_date_and_span_since_start_of_day.