--[[LuaDate version:2.1.0]]-------------------------------

--[[------------------------------------------------------

Copyright (C) 2006, by Jas Latrix (jastejada@yahoo.com)

All Rights Deserved.

use this code at your own risk!.

keep out of reach of children.

Copyright (C) 2013 update to Lua 5.2 by Thijs Schreijer

--]]------------------------------------------------------

--[[ CONSTANTS ]]--

local HOURPERDAY = 24

local MINPERHOUR = 60

local MINPERDAY = 1440 -- 24*60

local SECPERMIN = 60

local SECPERHOUR = 3600 -- 60*60

local SECPERDAY = 86400 -- 24*60*60

local TICKSPERSEC = 1000000

local TICKSPERDAY = 86400000000

local TICKSPERHOUR = 3600000000

local TICKSPERMIN = 60000000

local DAYNUM_MAX = 365242500 -- Sat Jan 01 1000000 00:00:00

local DAYNUM_MIN = -365242500 -- Mon Jan 01 1000000 BCE 00:00:00

local DAYNUM_DEF = 0 -- Mon Jan 01 0001 00:00:00

local _;

--[[ LOCAL ARE FASTER ]]--

local type = type

local pairs = pairs

local error = error

local assert = assert

local tonumber = tonumber

local tostring = tostring

local string = string

local math = math

local os = os

local unpack = unpack or table.unpack

local setmetatable = setmetatable

local getmetatable = getmetatable

--[[ EXTRA FUNCTIONS ]]--

local fmt = string.format

local lwr = string.lower

local upr = string.upper

local rep = string.rep

local len = string.len

local sub = string.sub

local gsub = string.gsub

local gmatch = string.gmatch or string.gfind

local find = string.find

local ostime = os.time

local osdate = os.date

local floor = math.floor

local ceil = math.ceil

local abs = math.abs

-- removes the decimal part of a number

local function fix(n) n = tonumber(n) return n and ((n > 0 and floor or ceil)(n)) end

-- returns the modulo n % d;

local function mod(n,d) return n - d*floor(n/d) end

-- rounds a number;

local function round(n, d) d=d^10 return floor((n*d)+.5)/d end

-- rounds a number to whole;

local function whole(n)return floor(n+.5)end

-- is `str` in string list `tbl`, `ml` is the minimun len

local function inlist(str, tbl, ml, tn)

local sl = len(str)

if sl < (ml or 0) then return nil end

str = lwr(str)

for k, v in pairs(tbl) do

if str == lwr(sub(v, 1, sl)) then

if tn then tn[0] = k end

return k

end

end

end

local function fnil() end

local function fret(x)return x;end

--[[ DATE FUNCTIONS ]]--

local DATE_EPOCH -- to be set later

local sl_weekdays = {

[0]="Sunday",[1]="Monday",[2]="Tuesday",[3]="Wednesday",[4]="Thursday",[5]="Friday",[6]="Saturday",

[7]="Sun",[8]="Mon",[9]="Tue",[10]="Wed",[11]="Thu",[12]="Fri",[13]="Sat",

}

local sl_meridian = {[-1]="AM", [1]="PM"}

local sl_months = {

[00]="January", [01]="February", [02]="March",

[03]="April", [04]="May", [05]="June",

[06]="July", [07]="August", [08]="September",

[09]="October", [10]="November", [11]="December",

[12]="Jan", [13]="Feb", [14]="Mar",

[15]="Apr", [16]="May", [17]="Jun",

[18]="Jul", [19]="Aug", [20]="Sep",

[21]="Oct", [22]="Nov", [23]="Dec",

}

-- added the '.2' to avoid collision, use `fix` to remove

local sl_timezone = {

[000]="utc", [0.2]="gmt",

[300]="est", [240]="edt",

[360]="cst", [300.2]="cdt",

[420]="mst", [360.2]="mdt",

[480]="pst", [420.2]="pdt",

}

-- set the day fraction resolution

local function setticks(t)

TICKSPERSEC = t;

TICKSPERDAY = SECPERDAY*TICKSPERSEC

TICKSPERHOUR= SECPERHOUR*TICKSPERSEC

TICKSPERMIN = SECPERMIN*TICKSPERSEC

end

-- is year y leap year?

local function isleapyear(y) -- y must be int!

return (mod(y, 4) == 0 and (mod(y, 100) ~= 0 or mod(y, 400) == 0))

end

-- day since year 0

local function dayfromyear(y) -- y must be int!

return 365*y + floor(y/4) - floor(y/100) + floor(y/400)

end

-- day number from date, month is zero base

local function makedaynum(y, m, d)

local mm = mod(mod(m,12) + 10, 12)

return dayfromyear(y + floor(m/12) - floor(mm/10)) + floor((mm*306 + 5)/10) + d - 307

--local yy = y + floor(m/12) - floor(mm/10)

--return dayfromyear(yy) + floor((mm*306 + 5)/10) + (d - 1)

end

-- date from day number, month is zero base

local function breakdaynum(g)

local g = g + 306

local y = floor((10000*g + 14780)/3652425)

local d = g - dayfromyear(y)

if d < 0 then y = y - 1; d = g - dayfromyear(y) end

local mi = floor((100*d + 52)/3060)

return (floor((mi + 2)/12) + y), mod(mi + 2,12), (d - floor((mi*306 + 5)/10) + 1)

end

--[[ for floats or int32 Lua Number data type

local function breakdaynum2(g)

local g, n = g + 306;

local n400 = floor(g/DI400Y);n = mod(g,DI400Y);

local n100 = floor(n/DI100Y);n = mod(n,DI100Y);

local n004 = floor(n/DI4Y); n = mod(n,DI4Y);

local n001 = floor(n/365); n = mod(n,365);

local y = (n400*400) + (n100*100) + (n004*4) + n001 - ((n001 == 4 or n100 == 4) and 1 or 0)

local d = g - dayfromyear(y)

local mi = floor((100*d + 52)/3060)

return (floor((mi + 2)/12) + y), mod(mi + 2,12), (d - floor((mi*306 + 5)/10) + 1)

end

]]

-- day fraction from time

local function makedayfrc(h,r,s,t)

return ((h*60 + r)*60 + s)*TICKSPERSEC + t

end

-- time from day fraction

local function breakdayfrc(df)

return

mod(floor(df/TICKSPERHOUR),HOURPERDAY),

mod(floor(df/TICKSPERMIN ),MINPERHOUR),

mod(floor(df/TICKSPERSEC ),SECPERMIN),

mod(df,TICKSPERSEC)

end

-- weekday sunday = 0, monday = 1 ...

local function weekday(dn) return mod(dn + 1, 7) end

-- yearday 0 based ...

local function yearday(dn)

return dn - dayfromyear((breakdaynum(dn))-1)

end

-- parse v as a month

local function getmontharg(v)

local m = tonumber(v);

return (m and fix(m - 1)) or inlist(tostring(v) or "", sl_months, 2)

end

-- get daynum of isoweek one of year y

local function isow1(y)

local f = makedaynum(y, 0, 4) -- get the date for the 4-Jan of year `y`

local d = weekday(f)

d = d == 0 and 7 or d -- get the ISO day number, 1 == Monday, 7 == Sunday

return f + (1 - d)

end

local function isowy(dn)

local w1;

local y = (breakdaynum(dn))

if dn >= makedaynum(y, 11, 29) then

w1 = isow1(y + 1);

if dn < w1 then

w1 = isow1(y);

else

y = y + 1;

end

else

w1 = isow1(y);

if dn < w1 then

w1 = isow1(y-1)

y = y - 1

end

end

return floor((dn-w1)/7)+1, y

end

local function isoy(dn)

local y = (breakdaynum(dn))

return y + (((dn >= makedaynum(y, 11, 29)) and (dn >= isow1(y + 1))) and 1 or (dn < isow1(y) and -1 or 0))

end

local function makedaynum_isoywd(y,w,d)

return isow1(y) + 7*w + d - 8 -- simplified: isow1(y) + ((w-1)*7) + (d-1)

end

--[[ THE DATE MOUDLE ]]--

local fmtstr = "%x %X";

--#if not DATE_OBJECT_AFX then

local date = {}

setmetatable(date, date)

-- Version: VMMMRRRR; V-Major, M-Minor, R-Revision; e.g. 5.45.321 == 50450321

date.version = 20010000 -- 2.1.0

--#end -- not DATE_OBJECT_AFX

--[[ THE DATE OBJECT ]]--

local dobj = {}

dobj.__index = dobj

dobj.__metatable = dobj

-- shout invalid arg

local function date_error_arg() return error("invalid argument(s)",0) end

-- create new date object

local function date_new(dn, df)

return setmetatable({daynum=dn, dayfrc=df}, dobj)

end

-- is `v` a date object?

local function date_isdobj(v)

return (type(v) == 'table' and getmetatable(v) == dobj) and v

end

--#if not NO_LOCAL_TIME_SUPPORT then

-- magic year table

local date_epoch, yt;

local function getequivyear(y)

assert(not yt)

yt = {}

local de, dw, dy = date_epoch:copy()

for i = 0, 3000 do

de:setyear(de:getyear() + 1, 1, 1)

dy = de:getyear()

dw = de:getweekday() * (isleapyear(dy) and -1 or 1)

if not yt[dw] then yt[dw] = dy end --print(de)

if yt[1] and yt[2] and yt[3] and yt[4] and yt[5] and yt[6] and yt[7] and yt[-1] and yt[-2] and yt[-3] and yt[-4] and yt[-5] and yt[-6] and yt[-7] then

getequivyear = function(y) return yt[ (weekday(makedaynum(y, 0, 1)) + 1) * (isleapyear(y) and -1 or 1) ] end

return getequivyear(y)

end

end

end

-- TimeValue from daynum and dayfrc

local function dvtotv(dn, df)

return fix(dn - DATE_EPOCH) * SECPERDAY + (df/1000)

end

-- TimeValue from date and time

local function totv(y,m,d,h,r,s)

return (makedaynum(y, m, d) - DATE_EPOCH) * SECPERDAY + ((h*60 + r)*60 + s)

end

-- TimeValue from TimeTable

local function tmtotv(tm)

return tm and totv(tm.year, tm.month - 1, tm.day, tm.hour, tm.min, tm.sec)

end

-- Returns the bias in seconds of utc time daynum and dayfrc

local function getbiasutc2(self)

local y,m,d = breakdaynum(self.daynum)

local h,r,s = breakdayfrc(self.dayfrc)

local tvu = totv(y,m,d,h,r,s) -- get the utc TimeValue of date and time

local tml = osdate("*t", tvu) -- get the local TimeTable of tvu

if (not tml) or (tml.year > (y+1) or tml.year < (y-1)) then -- failed try the magic

y = getequivyear(y)

tvu = totv(y,m,d,h,r,s)

tml = osdate("*t", tvu)

end

local tvl = tmtotv(tml)

if tvu and tvl then

return tvu - tvl, tvu, tvl

else

return error("failed to get bias from utc time")

end

end

-- Returns the bias in seconds of local time daynum and dayfrc

local function getbiasloc2(daynum, dayfrc)

local tvu

-- extract date and time

local y,m,d = breakdaynum(daynum)

local h,r,s = breakdayfrc(dayfrc)

-- get equivalent TimeTable

local tml = {year=y, month=m+1, day=d, hour=h, min=r, sec=s}

-- get equivalent TimeValue

local tvl = tmtotv(tml)

local function chkutc()

tml.isdst = nil; local tvug = ostime(tml) if tvug and (tvl == tmtotv(osdate("*t", tvug))) then tvu = tvug return end

tml.isdst = true; local tvud = ostime(tml) if tvud and (tvl == tmtotv(osdate("*t", tvud))) then tvu = tvud return end

tvu = tvud or tvug

end

chkutc()

if not tvu then

tml.year = getequivyear(y)

tvl = tmtotv(tml)

chkutc()

end

return ((tvu and tvl) and (tvu - tvl)) or error("failed to get bias from local time"), tvu, tvl

end

--#end -- not NO_LOCAL_TIME_SUPPORT

--#if not DATE_OBJECT_AFX then

-- the date parser

local strwalker = {} -- ^Lua regular expression is not as powerful as Perl$

strwalker.__index = strwalker

local function newstrwalker(s)return setmetatable({s=s, i=1, e=1, c=len(s)}, strwalker) end

function strwalker:aimchr() return "\n" .. self.s .. "\n" .. rep(".",self.e-1) .. "^" end

function strwalker:finish() return self.i > self.c end

function strwalker:back() self.i = self.e return self end

function strwalker:restart() self.i, self.e = 1, 1 return self end

function strwalker:match(s) return (find(self.s, s, self.i)) end

function strwalker:__call(s, f)-- print("strwalker:__call "..s..self:aimchr())

local is, ie; is, ie, self[1], self[2], self[3], self[4], self[5] = find(self.s, s, self.i)

if is then self.e, self.i = self.i, 1+ie; if f then f(unpack(self)) end return self end

end

local function date_parse(str)

local y,m,d, h,r,s, z, w,u, j, e, k, x,v,c, chkfin, dn,df;

local sw = newstrwalker(gsub(gsub(str, "(%b())", ""),"^(%s*)","")) -- remove comment, trim leading space

--local function error_out() print(y,m,d,h,r,s) end

local function error_dup(q) --[[error_out()]] error("duplicate value: " .. (q or "") .. sw:aimchr()) end

local function error_syn(q) --[[error_out()]] error("syntax error: " .. (q or "") .. sw:aimchr()) end

local function error_inv(q) --[[error_out()]] error("invalid date: " .. (q or "") .. sw:aimchr()) end

local function sety(q) y = y and error_dup() or tonumber(q); end

local function setm(q) m = (m or w or j) and error_dup(m or w or j) or tonumber(q) end

local function setd(q) d = d and error_dup() or tonumber(q) end

local function seth(q) h = h and error_dup() or tonumber(q) end

local function setr(q) r = r and error_dup() or tonumber(q) end

local function sets(q) s = s and error_dup() or tonumber(q) end

local function adds(q) s = s + tonumber(q) end

local function setj(q) j = (m or w or j) and error_dup() or tonumber(q); end

local function setz(q) z = (z ~= 0 and z) and error_dup() or q end

local function setzn(zs,zn) zn = tonumber(zn); setz( ((zn<24) and (zn*60) or (mod(zn,100) + floor(zn/100) * 60))*( zs=='+' and -1 or 1) ) end

local function setzc(zs,zh,zm) setz( ((tonumber(zh)*60) + tonumber(zm))*( zs=='+' and -1 or 1) ) end

if not (sw("^(%d%d%d%d)",sety) and (sw("^(%-?)(%d%d)%1(%d%d)",function(_,a,b) setm(tonumber(a)); setd(tonumber(b)) end) or sw("^(%-?)[Ww](%d%d)%1(%d?)",function(_,a,b) w, u = tonumber(a), tonumber(b or 1) end) or sw("^%-?(%d%d%d)",setj) or sw("^%-?(%d%d)",function(a) setm(a);setd(1) end))

and ((sw("^%s*[Tt]?(%d%d):?",seth) and sw("^(%d%d):?",setr) and sw("^(%d%d)",sets) and sw("^(%.%d+)",adds))

or sw:finish() or (sw"^%s*$" or sw"^%s*[Zz]%s*$" or sw("^%s-([%+%-])(%d%d):?(%d%d)%s*$",setzc) or sw("^%s*([%+%-])(%d%d)%s*$",setzn))

) )

then --print(y,m,d,h,r,s,z,w,u,j)

sw:restart(); y,m,d,h,r,s,z,w,u,j = nil;

repeat -- print(sw:aimchr())

if sw("^[tT:]?%s*(%d%d?):",seth) then --print("$Time")

_ = sw("^%s*(%d%d?)",setr) and sw("^%s*:%s*(%d%d?)",sets) and sw("^(%.%d+)",adds)

elseif sw("^(%d+)[/\\%s,-]?%s*") then --print("$Digits")

x, c = tonumber(sw[1]), len(sw[1])

if (x >= 70) or (m and d and (not y)) or (c > 3) then

sety( x + ((x >= 100 or c>3)and 0 or 1900) )

else

if m then setd(x) else m = x end

end

elseif sw("^(%a+)[/\%s,-]?%s*") then --print("$Words")

x = sw[1]

if inlist(x, sl_months, 2, sw) then

if m and (not d) and (not y) then d, m = m, false end

setm(mod(sw[0],12)+1)

elseif inlist(x, sl_timezone, 2, sw) then

c = fix(sw[0]) -- ignore gmt and utc

if c ~= 0 then setz(c, x) end

elseif inlist(x, sl_weekdays, 2, sw) then

k = sw[0]

else

sw:back()

-- am pm bce ad ce bc

if sw("^([bB])%s*(%.?)%s*[Cc]%s*(%2)%s*[Ee]%s*(%2)%s*") or sw("^([bB])%s*(%.?)%s*[Cc]%s*(%2)%s*") then

e = e and error_dup() or -1

elseif sw("^([aA])%s*(%.?)%s*[Dd]%s*(%2)%s*") or sw("^([cC])%s*(%.?)%s*[Ee]%s*(%2)%s*") then

e = e and error_dup() or 1

elseif sw("^([PApa])%s*(%.?)%s*[Mm]?%s*(%2)%s*") then

x = lwr(sw[1]) -- there should be hour and it must be correct

if (not h) or (h > 12) or (h < 0) then return error_inv() end

if x == 'a' and h == 12 then h = 0 end -- am

if x == 'p' and h ~= 12 then h = h + 12 end -- pm

else error_syn() end

end

elseif not(sw("^([+-])(%d%d?):(%d%d)",setzc) or sw("^([+-])(%d+)",setzn) or sw("^[Zz]%s*$")) then -- sw{"([+-])",{"(%d%d?):(%d%d)","(%d+)"}}

error_syn("?")

end

sw("^%s*") until sw:finish()

--else print("$Iso(Date|Time|Zone)")

end

-- if date is given, it must be complete year, month & day

if (not y and not h) or ((m and not d) or (d and not m)) or ((m and w) or (m and j) or (j and w)) then return error_inv("!") end

-- fix month

if m then m = m - 1 end

-- fix year if we are on BCE

if e and e < 0 and y > 0 then y = 1 - y end

-- create date object

dn = (y and ((w and makedaynum_isoywd(y,w,u)) or (j and makedaynum(y, 0, j)) or makedaynum(y, m, d))) or DAYNUM_DEF

df = makedayfrc(h or 0, r or 0, s or 0, 0) + ((z or 0)*TICKSPERMIN)

--print("Zone",h,r,s,z,m,d,y,df)

return date_new(dn, df) -- no need to :normalize();

end

local function date_fromtable(v)

local y, m, d = fix(v.year), getmontharg(v.month), fix(v.day)

local h, r, s, t = tonumber(v.hour), tonumber(v.min), tonumber(v.sec), tonumber(v.ticks)

-- atleast there is time or complete date

if (y or m or d) and (not(y and m and d)) then return error("incomplete table") end

return (y or h or r or s or t) and date_new(y and makedaynum(y, m, d) or DAYNUM_DEF, makedayfrc(h or 0, r or 0, s or 0, t or 0))

end

local tmap = {

['number'] = function(v) return date_epoch:copy():addseconds(v) end,

['string'] = function(v) return date_parse(v) end,

['boolean']= function(v) return date_fromtable(osdate(v and "!*t" or "*t")) end,

['table'] = function(v) local ref = getmetatable(v) == dobj; return ref and v or date_fromtable(v), ref end

}

local function date_getdobj(v)

local o, r = (tmap[type(v)] or fnil)(v);

return (o and o:normalize() or error"invalid date time value"), r -- if r is true then o is a reference to a date obj

end

--#end -- not DATE_OBJECT_AFX

local function date_from(...)

local y, m, d = fix(arg[1]), getmontharg(arg[2]), fix(arg[3])

local h, r, s, t = tonumber(arg[4] or 0), tonumber(arg[5] or 0), tonumber(arg[6] or 0), tonumber(arg[7] or 0)

if y and m and d and h and r and s and t then

return date_new(makedaynum(y, m, d), makedayfrc(h, r, s, t)):normalize()

else

return date_error_arg()

end

end

--[[ THE DATE OBJECT METHODS ]]--

function dobj:normalize()

local dn, df = fix(self.daynum), self.dayfrc

self.daynum, self.dayfrc = dn + floor(df/TICKSPERDAY), mod(df, TICKSPERDAY)

return (dn >= DAYNUM_MIN and dn <= DAYNUM_MAX) and self or error("date beyond imposed limits:"..self)

end

function dobj:getdate() local y, m, d = breakdaynum(self.daynum) return y, m+1, d end

function dobj:gettime() return breakdayfrc(self.dayfrc) end

function dobj:getclockhour() local h = self:gethours() return h>12 and mod(h,12) or (h==0 and 12 or h) end

function dobj:getyearday() return yearday(self.daynum) + 1 end

function dobj:getweekday() return weekday(self.daynum) + 1 end -- in lua weekday is sunday = 1, monday = 2 ...

function dobj:getyear() local r,_,_ = breakdaynum(self.daynum) return r end

function dobj:getmonth() local _,r,_ = breakdaynum(self.daynum) return r+1 end-- in lua month is 1 base

function dobj:getday() local _,_,r = breakdaynum(self.daynum) return r end

function dobj:gethours() return mod(floor(self.dayfrc/TICKSPERHOUR),HOURPERDAY) end

function dobj:getminutes() return mod(floor(self.dayfrc/TICKSPERMIN), MINPERHOUR) end

function dobj:getseconds() return mod(floor(self.dayfrc/TICKSPERSEC ),SECPERMIN) end

function dobj:getfracsec() return mod(floor(self.dayfrc/TICKSPERSEC ),SECPERMIN)+(mod(self.dayfrc,TICKSPERSEC)/TICKSPERSEC) end

function dobj:getticks(u) local x = mod(self.dayfrc,TICKSPERSEC) return u and ((x*u)/TICKSPERSEC) or x end

function dobj:getweeknumber(wdb)

local wd, yd = weekday(self.daynum), yearday(self.daynum)

if wdb then

wdb = tonumber(wdb)

if wdb then

wd = mod(wd-(wdb-1),7)-- shift the week day base

else

return date_error_arg()

end

end

return (yd < wd and 0) or (floor(yd/7) + ((mod(yd, 7)>=wd) and 1 or 0))

end

function dobj:getisoweekday() return mod(weekday(self.daynum)-1,7)+1 end -- sunday = 7, monday = 1 ...

function dobj:getisoweeknumber() return (isowy(self.daynum)) end

function dobj:getisoyear() return isoy(self.daynum) end

function dobj:getisodate()

local w, y = isowy(self.daynum)

return y, w, self:getisoweekday()

end

function dobj:setisoyear(y, w, d)

local cy, cw, cd = self:getisodate()

if y then cy = fix(tonumber(y))end

if w then cw = fix(tonumber(w))end

if d then cd = fix(tonumber(d))end

if cy and cw and cd then

self.daynum = makedaynum_isoywd(cy, cw, cd)

return self:normalize()

else

return date_error_arg()

end

end

function dobj:setisoweekday(d) return self:setisoyear(nil, nil, d) end

function dobj:setisoweeknumber(w,d) return self:setisoyear(nil, w, d) end

function dobj:setyear(y, m, d)

local cy, cm, cd = breakdaynum(self.daynum)

if y then cy = fix(tonumber(y))end

if m then cm = getmontharg(m) end

if d then cd = fix(tonumber(d))end

if cy and cm and cd then

self.daynum = makedaynum(cy, cm, cd)

return self:normalize()

else

return date_error_arg()

end

end

function dobj:setmonth(m, d)return self:setyear(nil, m, d) end

function dobj:setday(d) return self:setyear(nil, nil, d) end

function dobj:sethours(h, m, s, t)

local ch,cm,cs,ck = breakdayfrc(self.dayfrc)

ch, cm, cs, ck = tonumber(h or ch), tonumber(m or cm), tonumber(s or cs), tonumber(t or ck)

if ch and cm and cs and ck then

self.dayfrc = makedayfrc(ch, cm, cs, ck)

return self:normalize()

else

return date_error_arg()

end

end

function dobj:setminutes(m,s,t) return self:sethours(nil, m, s, t) end

function dobj:setseconds(s, t) return self:sethours(nil, nil, s, t) end

function dobj:setticks(t) return self:sethours(nil, nil, nil, t) end

function dobj:spanticks() return (self.daynum*TICKSPERDAY + self.dayfrc) end

function dobj:spanseconds() return (self.daynum*TICKSPERDAY + self.dayfrc)/TICKSPERSEC end

function dobj:spanminutes() return (self.daynum*TICKSPERDAY + self.dayfrc)/TICKSPERMIN end

function dobj:spanhours() return (self.daynum*TICKSPERDAY + self.dayfrc)/TICKSPERHOUR end

function dobj:spandays() return (self.daynum*TICKSPERDAY + self.dayfrc)/TICKSPERDAY end

function dobj:addyears(y, m, d)

local cy, cm, cd = breakdaynum(self.daynum)

if y then y = fix(tonumber(y))else y = 0 end

if m then m = fix(tonumber(m))else m = 0 end

if d then d = fix(tonumber(d))else d = 0 end

if y and m and d then

self.daynum = makedaynum(cy+y, cm+m, cd+d)

return self:normalize()

else

return date_error_arg()

end

end

function dobj:addmonths(m, d)

return self:addyears(nil, m, d)

end

local function dobj_adddayfrc(self,n,pt,pd)

n = tonumber(n)

if n then

local x = floor(n/pd);

self.daynum = self.daynum + x;

self.dayfrc = self.dayfrc + (n-x*pd)*pt;

return self:normalize()

else

return date_error_arg()

end

end

function dobj:adddays(n) return dobj_adddayfrc(self,n,TICKSPERDAY,1) end

function dobj:addhours(n) return dobj_adddayfrc(self,n,TICKSPERHOUR,HOURPERDAY) end

function dobj:addminutes(n) return dobj_adddayfrc(self,n,TICKSPERMIN,MINPERDAY) end

function dobj:addseconds(n) return dobj_adddayfrc(self,n,TICKSPERSEC,SECPERDAY) end

function dobj:addticks(n) return dobj_adddayfrc(self,n,1,TICKSPERDAY) end

local tvspec = {

-- Abbreviated weekday name (Sun)

['%a']=function(self) return sl_weekdays[weekday(self.daynum) + 7] end,

-- Full weekday name (Sunday)

['%A']=function(self) return sl_weekdays[weekday(self.daynum)] end,

-- Abbreviated month name (Dec)

['%b']=function(self) return sl_months[self:getmonth() - 1 + 12] end,

-- Full month name (December)

['%B']=function(self) return sl_months[self:getmonth() - 1] end,

-- Year/100 (19, 20, 30)

['%C']=function(self) return fmt("%.2d", fix(self:getyear()/100)) end,

-- The day of the month as a number (range 1 - 31)

['%d']=function(self) return fmt("%.2d", self:getday()) end,

-- year for ISO 8601 week, from 00 (79)

['%g']=function(self) return fmt("%.2d", mod(self:getisoyear() ,100)) end,

-- year for ISO 8601 week, from 0000 (1979)

['%G']=function(self) return fmt("%.4d", self:getisoyear()) end,

-- same as %b

['%h']=function(self) return self:fmt0("%b") end,

-- hour of the 24-hour day, from 00 (06)

['%H']=function(self) return fmt("%.2d", self:gethours()) end,

-- The hour as a number using a 12-hour clock (01 - 12)

['%I']=function(self) return fmt("%.2d", self:getclockhour()) end,

-- The day of the year as a number (001 - 366)

['%j']=function(self) return fmt("%.3d", self:getyearday()) end,

-- Month of the year, from 01 to 12

['%m']=function(self) return fmt("%.2d", self:getmonth()) end,

-- Minutes after the hour 55

['%M']=function(self) return fmt("%.2d", self:getminutes())end,

-- AM/PM indicator (AM)

['%p']=function(self) return sl_meridian[self:gethours() > 11 and 1 or -1] end, --AM/PM indicator (AM)

-- The second as a number (59, 20 , 01)

['%S']=function(self) return fmt("%.2d", self:getseconds()) end,

-- ISO 8601 day of the week, to 7 for Sunday (7, 1)

['%u']=function(self) return self:getisoweekday() end,

-- Sunday week of the year, from 00 (48)

['%U']=function(self) return fmt("%.2d", self:getweeknumber()) end,

-- ISO 8601 week of the year, from 01 (48)

['%V']=function(self) return fmt("%.2d", self:getisoweeknumber()) end,

-- The day of the week as a decimal, Sunday being 0

['%w']=function(self) return self:getweekday() - 1 end,

-- Monday week of the year, from 00 (48)

['%W']=function(self) return fmt("%.2d", self:getweeknumber(2)) end,

-- The year as a number without a century (range 00 to 99)

['%y']=function(self) return fmt("%.2d", mod(self:getyear() ,100)) end,

-- Year with century (2000, 1914, 0325, 0001)

['%Y']=function(self) return fmt("%.4d", self:getyear()) end,

-- Time zone offset, the date object is assumed local time (+1000, -0230)

['%z']=function(self) local b = -self:getbias(); local x = abs(b); return fmt("%s%.4d", b < 0 and "-" or "+", fix(x/60)*100 + floor(mod(x,60))) end,

-- Time zone name, the date object is assumed local time

['%Z']=function(self) return self:gettzname() end,

-- Misc --

-- Year, if year is in BCE, prints the BCE Year representation, otherwise result is similar to "%Y" (1 BCE, 40 BCE)

['%\b']=function(self) local x = self:getyear() return fmt("%.4d%s", x>0 and x or (-x+1), x>0 and "" or " BCE") end,

-- Seconds including fraction (59.998, 01.123)

['%\f']=function(self) local x = self:getfracsec() return fmt("%s%.9g",x >= 10 and "" or "0", x) end,

-- percent character %

['%%']=function(self) return "%" end,

-- Group Spec --

-- 12-hour time, from 01:00:00 AM (06:55:15 AM); same as "%I:%M:%S %p"

['%r']=function(self) return self:fmt0("%I:%M:%S %p") end,

-- hour:minute, from 01:00 (06:55); same as "%I:%M"

['%R']=function(self) return self:fmt0("%I:%M") end,

-- 24-hour time, from 00:00:00 (06:55:15); same as "%H:%M:%S"

['%T']=function(self) return self:fmt0("%H:%M:%S") end,

-- month/day/year from 01/01/00 (12/02/79); same as "%m/%d/%y"

['%D']=function(self) return self:fmt0("%m/%d/%y") end,

-- year-month-day (1979-12-02); same as "%Y-%m-%d"

['%F']=function(self) return self:fmt0("%Y-%m-%d") end,

-- The preferred date and time representation; same as "%x %X"

['%c']=function(self) return self:fmt0("%x %X") end,

-- The preferred date representation, same as "%a %b %d %\b"

['%x']=function(self) return self:fmt0("%a %b %d %\b") end,

-- The preferred time representation, same as "%H:%M:%\f"

['%X']=function(self) return self:fmt0("%H:%M:%\f") end,

-- GroupSpec --

-- Iso format, same as "%Y-%m-%dT%T"

['${iso}'] = function(self) return self:fmt0("%Y-%m-%dT%T") end,

-- http format, same as "%a, %d %b %Y %T GMT"

['${http}'] = function(self) return self:fmt0("%a, %d %b %Y %T GMT") end,

-- ctime format, same as "%a %b %d %T GMT %Y"

['${ctime}'] = function(self) return self:fmt0("%a %b %d %T GMT %Y") end,

-- RFC850 format, same as "%A, %d-%b-%y %T GMT"

['${rfc850}'] = function(self) return self:fmt0("%A, %d-%b-%y %T GMT") end,

-- RFC1123 format, same as "%a, %d %b %Y %T GMT"

['${rfc1123}'] = function(self) return self:fmt0("%a, %d %b %Y %T GMT") end,

-- asctime format, same as "%a %b %d %T %Y"

['${asctime}'] = function(self) return self:fmt0("%a %b %d %T %Y") end,

}

function dobj:fmt0(str) return (gsub(str, "%%[%a%%\b\f]", function(x) local f = tvspec[x];return (f and f(self)) or x end)) end

function dobj:fmt(str)

str = str or self.fmtstr or fmtstr

return self:fmt0((gmatch(str, "${%w+}")) and (gsub(str, "${%w+}", function(x)local f=tvspec[x];return (f and f(self)) or x end)) or str)

end

function dobj.__lt(a,b) return (a.daynum == b.daynum) and (a.dayfrc < b.dayfrc) or (a.daynum < b.daynum) end

function dobj.__le(a, b)return (a.daynum == b.daynum) and (a.dayfrc <= b.dayfrc) or (a.daynum <= b.daynum) end

function dobj.__eq(a, b)return (a.daynum == b.daynum) and (a.dayfrc == b.dayfrc) end

function dobj.__sub(a,b)

local d1, d2 = date_getdobj(a), date_getdobj(b)

local d0 = d1 and d2 and date_new(d1.daynum - d2.daynum, d1.dayfrc - d2.dayfrc)

return d0 and d0:normalize()

end

function dobj.__add(a,b)

local d1, d2 = date_getdobj(a), date_getdobj(b)

local d0 = d1 and d2 and date_new(d1.daynum + d2.daynum, d1.dayfrc + d2.dayfrc)

return d0 and d0:normalize()

end

function dobj.__concat(a, b) return tostring(a) .. tostring(b) end

function dobj:__tostring() return self:fmt() end

function dobj:copy() return date_new(self.daynum, self.dayfrc) end

--[[ THE LOCAL DATE OBJECT METHODS ]]--

function dobj:tolocal()

local dn,df = self.daynum, self.dayfrc

local bias = getbiasutc2(self)

if bias then

-- utc = local + bias; local = utc - bias

self.daynum = dn

self.dayfrc = df - bias*TICKSPERSEC

return self:normalize()

else

return nil

end

end

function dobj:toutc()

local dn,df = self.daynum, self.dayfrc

local bias = getbiasloc2(dn, df)

if bias then

-- utc = local + bias;

self.daynum = dn

self.dayfrc = df + bias*TICKSPERSEC

return self:normalize()

else

return nil

end

end

function dobj:getbias() return (getbiasloc2(self.daynum, self.dayfrc))/SECPERMIN end

function dobj:gettzname()

local _, tvu, _ = getbiasloc2(self.daynum, self.dayfrc)

return tvu and osdate("%Z",tvu) or ""

end

--#if not DATE_OBJECT_AFX then

function date.time(h, r, s, t)

h, r, s, t = tonumber(h or 0), tonumber(r or 0), tonumber(s or 0), tonumber(t or 0)

if h and r and s and t then

return date_new(DAYNUM_DEF, makedayfrc(h, r, s, t))

else

return date_error_arg()

end

end

function date:__call(...)

local n = arg.n

if n > 1 then return (date_from(unpack(arg)))

elseif n == 0 then return (date_getdobj(false))

else local o, r = date_getdobj(arg[1]); return r and o:copy() or o end

end

date.diff = dobj.__sub

function date.isleapyear(v)

local y = fix(v);

if not y then

y = date_getdobj(v)

y = y and y:getyear()

end

return isleapyear(y+0)

end

function date.epoch() return date_epoch:copy() end

function date.isodate(y,w,d) return date_new(makedaynum_isoywd(y + 0, w and (w+0) or 1, d and (d+0) or 1), 0) end

-- Internal functions

function date.fmt(str) if str then fmtstr = str end; return fmtstr end

function date.daynummin(n) DAYNUM_MIN = (n and n < DAYNUM_MAX) and n or DAYNUM_MIN return n and DAYNUM_MIN or date_new(DAYNUM_MIN, 0):normalize()end

function date.daynummax(n) DAYNUM_MAX = (n and n > DAYNUM_MIN) and n or DAYNUM_MAX return n and DAYNUM_MAX or date_new(DAYNUM_MAX, 0):normalize()end

function date.ticks(t) if t then setticks(t) end return TICKSPERSEC end

--#end -- not DATE_OBJECT_AFX

local tm = osdate("!*t", 0);

if tm then

date_epoch = date_new(makedaynum(tm.year, tm.month - 1, tm.day), makedayfrc(tm.hour, tm.min, tm.sec, 0))

-- the distance from our epoch to os epoch in daynum

DATE_EPOCH = date_epoch and date_epoch:spandays()

else -- error will be raise only if called!

date_epoch = setmetatable({},{__index = function() error("failed to get the epoch date") end})

end

--#if not DATE_OBJECT_AFX then

return date

--#else

--$return date_from

--#end