lua 日期与时间操作

require 'math'
require 'os'

dateopt = {}
dateopt_mt = { __index = dateopt }
function dateopt:new()
local self = {}
setmetatable(self,dateopt_mt)
self.year = 1970
self.month = 1
self.day = 1
self.wday = 0
self.hour = 0
self.minute = 0
self.second = 0
return self
end

function dateopt:init(year,month,day)
self.year =year
self.month = month
self.day = day
end

function dateopt:subDay(opttime)
local  _days = 0
local _selfBigger = false
if (self.year > opttime.year) then
_selfBigger = true
elseif  (self.year == opttime.year) then
if (self.month > opttime.month) then
_selfBigger = true
elseif (self.month == opttime.month) then
if  (self.day > opttime.day) then
_selfBigger = true
elseif (self.day == opttime.day) then
return 0
end
end
end
local _bigDate = dateopt:new()
local  _smallDate =dateopt:new()
if _selfBigger == true then
_bigDate.year = self.year
_bigDate.month = self.month
_bigDate.day = self.day

_smallDate.year = opttime.year
_smallDate.month = opttime.month
_smallDate.day = opttime.day
else
_bigDate.year = opttime.year
_bigDate.month =opttime.month
_bigDate.day =opttime.day

_smallDate.year = self.year
_smallDate.month = self.month
_smallDate.day = self.day
end

for  _i = _smallDate.year, _bigDate.year-1 do
if((_i % 4 == 0 and _i % 100 ~= 0) or  _i % 400 == 0) then
_days =_days+366
else
_days = _days+365
end
end

for  _i = 1,_smallDate.month-1 do
if (_i == 1 or _i == 3 or _i == 5 or _i == 7 or _i == 8 or _i == 10 or _i == 12) then
_days = _days - 31
elseif (_i == 4 or _i == 6 or _i == 9 or _i == 11) then
_days =_days - 30
elseif (_i == 2) then
if (_smallDate.year % 4 == 0 and _smallDate.year % 100 ~= 0) or  (_smallDate.year % 400 == 0 ) then
_days = _days - 29
else
_days = _days - 28
end
end
end
_days =_days- _smallDate.day

for  _i = 1,_bigDate.month-1 do
if (_i == 1 or _i == 3 or _i == 5 or _i == 7 or _i == 8 or _i == 10 or _i == 12) then
_days =_days+31
elseif (_i == 4 or _i == 6 or _i == 9 or _i == 11) then
_days = _days+30
elseif _i == 2 then
if ((_bigDate.year % 4 == 0 and _bigDate.year % 100 ~= 0) or _bigDate.year % 400 == 0)  then
_days =_days+ 29
else
_days =_days+28
end
end
end
_days = _days+_bigDate.day

return _days
end

function getCurrentWeekday()
local weekday = os.date("%w")
return weekday
end
function getCurrentDate()
local year= os.date("%Y")
local month =os.date("%m")
local day = os.date("%d")

return year,month,day
end

function get1970ToNow_subdays()
local Date1 = dateopt:new()
local Date2 = dateopt:new()
local year =0
local month = 0
local day = 0
local _nDays = 0

year,month,day = getCurrentDate()
Date2:init(tonumber(year),tonumber(month),tonumber(day))
_nDays = Date1:subDay(Date2)
return _nDays
end

print(get1970ToNow_subdays())
print(getCurrentWeekday())
print(getCurrentDate())