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--[[
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 two 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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