--- /dev/null
+--[[
+
+HTTP protocol implementation for LuCI - date handling
+(c) 2008 Freifunk Leipzig / Jo-Philipp Wich <xm@leipzig.freifunk.net>
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+$Id$
+
+]]--
+
+module("luci.http.protocol.date", package.seeall)
+
+MONTHS = {
+ "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug",
+ "Sep", "Oct", "Nov", "Dec"
+}
+
+-- This list is stolen from Perl's Time::Timezone
+TZ = {
+ -- DST zones
+ ["brst"] = -2*3600; -- Brazil Summer Time (East Daylight)
+ ["adt"] = -3*3600; -- Atlantic Daylight
+ ["edt"] = -4*3600; -- Eastern Daylight
+ ["cdt"] = -5*3600; -- Central Daylight
+ ["mdt"] = -6*3600; -- Mountain Daylight
+ ["pdt"] = -7*3600; -- Pacific Daylight
+ ["ydt"] = -8*3600; -- Yukon Daylight
+ ["hdt"] = -9*3600; -- Hawaii Daylight
+ ["bst"] = 1*3600; -- British Summer
+ ["mest"] = 2*3600; -- Middle European Summer
+ ["sst"] = 2*3600; -- Swedish Summer
+ ["fst"] = 2*3600; -- French Summer
+ ["eest"] = 3*3600; -- Eastern European Summer
+ ["cest"] = 2*3600; -- Central European Daylight
+ ["wadt"] = 8*3600; -- West Australian Daylight
+ ["kdt"] = 10*3600; -- Korean Daylight
+ ["eadt"] = 11*3600; -- Eastern Australian Daylight
+ ["nzdt"] = 13*3600; -- New Zealand Daylight
+
+ -- zones
+ ["gmt"] = 0; -- Greenwich Mean
+ ["ut"] = 0; -- Universal (Coordinated)
+ ["utc"] = 0;
+ ["wet"] = 0; -- Western European
+ ["wat"] = -1*3600; -- West Africa
+ ["azost"] = -1*3600; -- Azores Standard Time
+ ["cvt"] = -1*3600; -- Cape Verde Time
+ ["at"] = -2*3600; -- Azores
+ ["fnt"] = -2*3600; -- Brazil Time (Extreme East - Fernando Noronha)
+ ["ndt"] = -2*3600+1800;-- Newfoundland Daylight
+ ["art"] = -3*3600; -- Argentina Time
+ ["nft"] = -3*3600+1800;-- Newfoundland
+ ["mnt"] = -4*3600; -- Brazil Time (West Standard - Manaus)
+ ["ewt"] = -4*3600; -- U.S. Eastern War Time
+ ["ast"] = -4*3600; -- Atlantic Standard
+ ["bot"] = -4*3600; -- Bolivia Time
+ ["vet"] = -4*3600; -- Venezuela Time
+ ["est"] = -5*3600; -- Eastern Standard
+ ["cot"] = -5*3600; -- Colombia Time
+ ["act"] = -5*3600; -- Brazil Time (Extreme West - Acre)
+ ["pet"] = -5*3600; -- Peru Time
+ ["cst"] = -6*3600; -- Central Standard
+ ["cest"] = 2*3600; -- Central European Summer
+ ["mst"] = -7*3600; -- Mountain Standard
+ ["pst"] = -8*3600; -- Pacific Standard
+ ["yst"] = -9*3600; -- Yukon Standard
+ ["hst"] = -10*3600; -- Hawaii Standard
+ ["cat"] = -10*3600; -- Central Alaska
+ ["ahst"] = -10*3600; -- Alaska-Hawaii Standard
+ ["taht"] = -10*3600; -- Tahiti Time
+ ["nt"] = -11*3600; -- Nome
+ ["idlw"] = -12*3600; -- International Date Line West
+ ["cet"] = 1*3600; -- Central European
+ ["mez"] = 1*3600; -- Central European (German)
+ ["met"] = 1*3600; -- Middle European
+ ["mewt"] = 1*3600; -- Middle European Winter
+ ["swt"] = 1*3600; -- Swedish Winter
+ ["set"] = 1*3600; -- Seychelles
+ ["fwt"] = 1*3600; -- French Winter
+ ["west"] = 1*3600; -- Western Europe Summer Time
+ ["eet"] = 2*3600; -- Eastern Europe; USSR Zone 1
+ ["ukr"] = 2*3600; -- Ukraine
+ ["sast"] = 2*3600; -- South Africa Standard Time
+ ["bt"] = 3*3600; -- Baghdad; USSR Zone 2
+ ["eat"] = 3*3600; -- East Africa Time
+ ["irst"] = 3*3600+1800;-- Iran Standard Time
+ ["zp4"] = 4*3600; -- USSR Zone 3
+ ["msd"] = 4*3600; -- Moscow Daylight Time
+ ["sct"] = 4*3600; -- Seychelles Time
+ ["zp5"] = 5*3600; -- USSR Zone 4
+ ["azst"] = 5*3600; -- Azerbaijan Summer Time
+ ["mvt"] = 5*3600; -- Maldives Time
+ ["uzt"] = 5*3600; -- Uzbekistan Time
+ ["ist"] = 5*3600+1800;-- Indian Standard
+ ["zp6"] = 6*3600; -- USSR Zone 5
+ ["lkt"] = 6*3600; -- Sri Lanka Time
+ ["pkst"] = 6*3600; -- Pakistan Summer Time
+ ["yekst"] = 6*3600; -- Yekaterinburg Summer Time
+ ["wast"] = 7*3600; -- West Australian Standard
+ ["ict"] = 7*3600; -- Indochina Time
+ ["wit"] = 7*3600; -- Western Indonesia Time
+ ["cct"] = 8*3600; -- China Coast; USSR Zone 7
+ ["wst"] = 8*3600; -- West Australian Standard
+ ["hkt"] = 8*3600; -- Hong Kong
+ ["bnt"] = 8*3600; -- Brunei Darussalam Time
+ ["cit"] = 8*3600; -- Central Indonesia Time
+ ["myt"] = 8*3600; -- Malaysia Time
+ ["pht"] = 8*3600; -- Philippines Time
+ ["sgt"] = 8*3600; -- Singapore Time
+ ["jst"] = 9*3600; -- Japan Standard; USSR Zone 8
+ ["kst"] = 9*3600; -- Korean Standard
+ ["east"] = 10*3600; -- Eastern Australian Standard
+ ["gst"] = 10*3600; -- Guam Standard; USSR Zone 9
+ ["nct"] = 11*3600; -- New Caledonia Time
+ ["nzt"] = 12*3600; -- New Zealand
+ ["nzst"] = 12*3600; -- New Zealand Standard
+ ["fjt"] = 12*3600; -- Fiji Time
+ ["idle"] = 12*3600; -- International Date Line East
+}
+
+
+-- Find corresponding timezone offset
+function tz_offset(tz)
+
+ if type(tz) == "string" then
+
+ -- check for a numeric identifier
+ local s, v = tz:match("([%+%-])([0-9]+)")
+ if s == '+' then s = 1 else s = -1 end
+ if v then v = tonumber(v) end
+
+ if s and v then
+ return s * 60 * ( math.floor( v / 100 ) * 60 + ( v % 100 ) )
+
+ -- lookup symbolic tz
+ elseif TZ[tz:lower()] then
+ return TZ[tz:lower()]
+ end
+
+ end
+
+ -- bad luck
+ return 0
+end
+
+-- Convert a HTTP date to unixtime
+function to_unix(date)
+
+ print("D: "..date)
+
+ local wd, day, mon, yr, hr, min, sec, tz = date:match(
+ "([A-Z][a-z][a-z]), ([0-9]+) " ..
+ "([A-Z][a-z][a-z]) ([0-9]+) " ..
+ "([0-9]+):([0-9]+):([0-9]+) " ..
+ "([A-Z0-9%+%-]+)"
+ )
+
+ print(day .. " | " .. mon .. " | " .. yr .. " | " .. tz)
+
+ if day and mon and yr and hr and min and sec then
+
+ -- find month
+ local month = 1
+ for i = 1, 12 do
+ if MONTHS[i] == mon then
+ month = i
+ break
+ end
+ end
+
+ -- convert to epoch time
+ return tz_offset(tz) + os.time( {
+ year = yr,
+ month = month,
+ day = day,
+ hour = hr,
+ min = min,
+ sec = sec
+ } )
+ end
+
+ return 0
+end
+
+-- Convert a unixtime to HTTP date
+function to_http(time)
+ return os.date( "%a, %d %b %Y %H:%M:%S GMT", time )
+end
+
+-- Compare to dates
+function compare(d1, d2)
+
+ if d1:match("[^0-9]") then d1 = to_unix(d1) end
+ if d2:match("[^0-9]") then d2 = to_unix(d2) end
+
+ if d1 == d2 then
+ return 0
+ elseif d1 < d2 then
+ return -1
+ else
+ return 1
+ end
+end
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