type t = { created: string; edited: string }
let compare = compare
let rfc_string date = date
let of_string (rfc : string) = rfc
let listing date = if date.edited <> "" then date.edited else date.created
let months = [|"Jan";"Feb";"Mar";"Apr";"May";"Jun";"Jul";"Aug";"Sep";"Oct";"Nov";"Dec"|]
let pretty_date date =
	try Scanf.sscanf date "%4s-%d-%2s" (fun y m d -> Printf.sprintf "%s %s, %s" d (months.(m-1)) y)
	with
	| Scanf.Scan_failure s as e -> Printf.fprintf stderr "%s for %s\n" s date; raise e
	| Invalid_argument _s as e -> Printf.fprintf stderr "Parsing %s" date; raise e
let now () = Unix.time () |> Unix.gmtime |>
	(fun t -> Printf.sprintf "%4d-%02d-%02dT%02d:%02d:%02dZ"
	 (t.tm_year+1900) (t.tm_mon+1) t.tm_mday t.tm_hour t.tm_min t.tm_sec)
let to_secs date =
	Scanf.sscanf date "%4d-%02d-%02dT%02d:%02d:%02d"
		(fun y mo d h mi s -> (y-1970)*31557600 + mo*2629800 + d*86400 + h*3600 + mi*60 + s)
let of_secs s =
	let { Unix.tm_sec=seconds; tm_min=minutes; tm_hour=hours;
		tm_mday=day; tm_mon=month; tm_year=year; _ } = Unix.localtime (float_of_int s) in
		Printf.sprintf "%4d-%02d-%02dT%02d:%02d:%02d"
			(year+1900) (month+1) day hours minutes seconds