module Extended_date : sig .. end
val format : ?ofday:Core.Std.Time.Ofday.t -> string -> Core.Std.Date.t -> string
Shortcut for calling Core_extended.Unix.strftime without having to create a Time.t and convert it to a Unix.tm.

format "%Y-%m-%d" t will return "YYYY-MM-DD"

module Extended_span : sig .. end
val to_string_hum : Core.Std.Time.Span.t -> string
Convert a time span to a human-readable string, e.g. "1:23:45.778" (versus "1.396h" from Time.Span.to_string).