-- Prosody IM

-- Copyright (C) 2008-2010 Matthew Wild

-- Copyright (C) 2008-2010 Waqas Hussain

-- 

-- This project is MIT/X11 licensed. Please see the

-- COPYING file in the source package for more information.

--

-- XEP-0082: XMPP Date and Time Profiles

local os_date = os.date;

local os_time = os.time;

local os_difftime = os.difftime;

local error = error;

local tonumber = tonumber;

module "datetime"

function date(t)

	return os_date("!%Y-%m-%d", t);

end

function datetime(t)

	return os_date("!%Y-%m-%dT%H:%M:%SZ", t);

end

function time(t)

	return os_date("!%H:%M:%S", t);

end

function legacy(t)

	return os_date("!%Y%m%dT%H:%M:%S", t);

end

function parse(s)

	if s then

		local year, month, day, hour, min, sec, tzd;

		year, month, day, hour, min, sec, tzd = s:match("^(%d%d%d%d)%-?(%d%d)%-?(%d%d)T(%d%d):(%d%d):(%d%d)%.?%d*([Z+%-]?.*)$");

		if year then

			local time_offset = os_difftime(os_time(os_date("*t")), os_time(os_date("!*t"))); -- to deal with local timezone

			local tzd_offset = 0;

			if tzd ~= "" and tzd ~= "Z" then

				local sign, h, m = tzd:match("([+%-])(%d%d):?(%d*)");

				if not sign then return; end

				if #m ~= 2 then m = "0"; end

				h, m = tonumber(h), tonumber(m);

				tzd_offset = h * 60 * 60 + m * 60;

				if sign == "-" then tzd_offset = -tzd_offset; end

			end

			sec = (sec + time_offset) - tzd_offset;

			return os_time({year=year, month=month, day=day, hour=hour, min=min, sec=sec, isdst=false});

		end

	end

end

return _M;